%!PS-Adobe-2.0
%%BeginResource: font lsunr00
%!PS-AdobeFont-1.1: LucidaSansUnicode00 0.9
%%CreationDate: 1994 Jun 04 09:53:35
% Lucida is a registered trademark of Bigelow & Holmes Inc.
% NOTE:  This is a partial font in Adobe Type 1 format.
% The complete font in fully hinted ATM compatible form is available from Y&Y
% (508) 371-3286 USA, email: tech-help@YandY.com, http://www.YandY.com
11 dict begin
/FontInfo 9 dict dup begin
/version (0.9) readonly def
/Notice ((C) 1991, 1993 Bigelow & Holmes Inc.  Pat. Des.  289,420. All rights reserved.) readonly def
/Notice ((C) 1994 Y&Y Inc. All rights reserved.) readonly def
/FullName (Lucida Sans Unicode 00) readonly def
/FamilyName (LucidaSansUnicode) readonly def
/Weight (Normal) readonly def
/ItalicAngle 0 def
/isFixedPitch false def
/UnderlinePosition -100 def
/UnderlineThickness 50 def
end readonly def
/FontName /LucidaSansUnicode00 def
/PaintType 0 def
/FontType 1 def
/FontMatrix [0.001 0 0 0.001 0 0] readonly def
/Encoding 256 array
0 1 255 {1 index exch /.notdef put} for
dup 100 /0064 put
dup 101 /0065 put
dup 102 /0066 put
dup 103 /0067 put
dup 104 /0068 put
dup 105 /0069 put
dup 106 /006a put
dup 107 /006b put
dup 108 /006c put
dup 109 /006d put
dup 110 /006e put
dup 111 /006f put
dup 112 /0070 put
dup 113 /0071 put
dup 114 /0072 put
dup 115 /0073 put
dup 116 /0074 put
dup 117 /0075 put
dup 118 /0076 put
dup 119 /0077 put
dup 120 /0078 put
dup 121 /0079 put
dup 122 /007a put
dup 123 /007b put
dup 124 /007c put
dup 125 /007d put
dup 126 /007e put
dup 163 /00a3 put
dup 167 /00a7 put
dup 169 /00a9 put
dup 173 /00ad put
dup 174 /00ae put
dup 176 /00b0 put
dup 177 /00b1 put
dup 180 /00b4 put
dup 181 /00b5 put
dup 182 /00b6 put
dup 185 /00b9 put
dup 186 /00ba put
dup 188 /00bc put
dup 189 /00bd put
dup 191 /00bf put
dup 198 /00c6 put
dup 215 /00d7 put
dup 223 /00df put
dup 231 /00e7 put
dup 233 /00e9 put
dup 237 /00ed put
dup 239 /00ef put
dup 241 /00f1 put
dup 247 /00f7 put
dup 252 /00fc put
dup 32 /0020 put
dup 33 /0021 put
dup 34 /0022 put
dup 35 /0023 put
dup 36 /0024 put
dup 37 /0025 put
dup 38 /0026 put
dup 40 /0028 put
dup 41 /0029 put
dup 42 /002a put
dup 43 /002b put
dup 44 /002c put
dup 45 /002d put
dup 46 /002e put
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dup 48 /0030 put
dup 49 /0031 put
dup 50 /0032 put
dup 51 /0033 put
dup 52 /0034 put
dup 53 /0035 put
dup 54 /0036 put
dup 55 /0037 put
dup 56 /0038 put
dup 57 /0039 put
dup 58 /003a put
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dup 60 /003c put
dup 61 /003d put
dup 62 /003e put
dup 63 /003f put
dup 65 /0041 put
dup 66 /0042 put
dup 67 /0043 put
dup 68 /0044 put
dup 69 /0045 put
dup 70 /0046 put
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dup 72 /0048 put
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dup 74 /004a put
dup 75 /004b put
dup 76 /004c put
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dup 78 /004e put
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dup 80 /0050 put
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dup 85 /0055 put
dup 86 /0056 put
dup 87 /0057 put
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dup 89 /0059 put
dup 90 /005a put
dup 91 /005b put
dup 92 /005c put
dup 93 /005d put
dup 95 /005f put
dup 96 /0060 put
dup 97 /0061 put
dup 98 /0062 put
dup 99 /0063 put
readonly def
/FontBBox{-90 -211 977 1005}readonly def
%/UniqueID 5054500 def
currentdict end
currentfile eexec
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cleartomark
%%EndResource
%%BeginResource: font lsunr03
%!PS-AdobeFont-1.1: LucidaSansUnicode03 0.9
%%CreationDate: 1994 Jun 04 09:58:17
% Lucida is a registered trademark of Bigelow & Holmes Inc.
% NOTE:  This is a partial font in Adobe Type 1 format.
% The complete font in fully hinted ATM compatible form is available from Y&Y
% (508) 371-3286 USA, email: tech-help@YandY.com, http://www.YandY.com
11 dict begin
/FontInfo 9 dict dup begin
/version (0.9) readonly def
/Notice ((c) 1993 Bigelow & Holmes Inc. Pat. Des. 289,420. All rights reserved.) readonly def
/Notice ((c) 1994 Y&Y Inc. All rights reserved.) readonly def
/FullName (Lucida Sans Unicode 03) readonly def
/FamilyName (LucidaSansUnicode) readonly def
/Weight (Normal) readonly def
/ItalicAngle 0 def
/isFixedPitch false def
/UnderlinePosition -100 def
/UnderlineThickness 50 def
end readonly def
/FontName /LucidaSansUnicode03 def
/PaintType 0 def
/FontType 1 def
/FontMatrix [0.001 0 0 0.001 0 0] readonly def
/Encoding 256 array
0 1 255 {1 index exch /.notdef put} for
dup 148 /0394 put
dup 154 /039a put
dup 166 /03a6 put
dup 173 /03ad put
dup 177 /03b1 put
dup 178 /03b2 put
dup 180 /03b4 put
dup 181 /03b5 put
dup 183 /03b7 put
dup 186 /03ba put
dup 187 /03bb put
dup 188 /03bc put
dup 192 /03c0 put
dup 193 /03c1 put
dup 195 /03c3 put
dup 196 /03c4 put
dup 199 /03c7 put
dup 204 /03cc put
readonly def
/FontBBox{-615 -440 726 1024}readonly def
%/UniqueID 5054503 def
currentdict end
currentfile eexec
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cleartomark
%%EndResource
%%BeginResource: font lsunr04
%!PS-AdobeFont-1.1: LucidaSansUnicode04 0.9
%%CreationDate: 1994 Jun 04 09:58:28
% Lucida is a registered trademark of Bigelow & Holmes Inc.
% NOTE:  This is a partial font in Adobe Type 1 format.
% The complete font in fully hinted ATM compatible form is available from Y&Y
% (508) 371-3286 USA, email: tech-help@YandY.com, http://www.YandY.com
11 dict begin
/FontInfo 9 dict dup begin
/version (0.9) readonly def
/Notice ((c) 1993 Bigelow & Holmes Inc. Pat. Des. 289,420. All rights reserved.) readonly def
/Notice ((c) 1994 Y&Y Inc. All rights reserved.) readonly def
/FullName (Lucida Sans Unicode 04) readonly def
/FamilyName (LucidaSansUnicode) readonly def
/Weight (Normal) readonly def
/ItalicAngle 0 def
/isFixedPitch false def
/UnderlinePosition -100 def
/UnderlineThickness 50 def
end readonly def
/FontName /LucidaSansUnicode04 def
/PaintType 0 def
/FontType 1 def
/FontMatrix [0.001 0 0 0.001 0 0] readonly def
/Encoding 256 array
0 1 255 {1 index exch /.notdef put} for
dup 57 /0439 put
dup 74 /044a put
dup 76 /044c put
dup 79 /044f put
dup 81 /0451 put
readonly def
/FontBBox{-90 -211 1024 940}readonly def
%/UniqueID 5054504 def
currentdict end
currentfile eexec
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cleartomark
%%EndResource
%%BeginResource: font lsunr20
%!PS-AdobeFont-1.1: LucidaSansUnicode20 0.9
%%CreationDate: 1994 Jun 04 10:00:12
% Lucida is a registered trademark of Bigelow & Holmes Inc.
% NOTE:  This is a partial font in Adobe Type 1 format.
% The complete font in fully hinted ATM compatible form is available from Y&Y
% (508) 371-3286 USA, email: tech-help@YandY.com, http://www.YandY.com
11 dict begin
/FontInfo 9 dict dup begin
/version (0.9) readonly def
/Notice ((c) 1993 Bigelow & Holmes Inc. Pat. Des. 289,420. All rights reserved.) readonly def
/Notice ((c) 1994 Y&Y Inc. All rights reserved.) readonly def
/FullName (Lucida Sans Unicode 20) readonly def
/FamilyName (LucidaSansUnicode) readonly def
/Weight (Normal) readonly def
/ItalicAngle 0 def
/isFixedPitch false def
/UnderlinePosition -100 def
/UnderlineThickness 50 def
end readonly def
/FontName /LucidaSansUnicode20 def
/PaintType 0 def
/FontType 1 def
/FontMatrix [0.001 0 0 0.001 0 0] readonly def
/Encoding 256 array
0 1 255 {1 index exch /.notdef put} for
dup 19 /2013 put
dup 20 /2014 put
dup 24 /2018 put
dup 25 /2019 put
dup 32 /2020 put
dup 33 /2021 put
dup 34 /2022 put
readonly def
/FontBBox{-615 -440 726 1024}readonly def
%/UniqueID 5054520 def
currentdict end
currentfile eexec
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cleartomark
%%EndResource
%%BeginResource: font lsunr21
%!PS-AdobeFont-1.1: LucidaSansUnicode21 0.9
%%CreationDate: 1994 Jun 04 10:04:24
% Lucida is a registered trademark of Bigelow & Holmes Inc.
% NOTE:  This is a partial font in Adobe Type 1 format.
% The complete font in fully hinted ATM compatible form is available from Y&Y
% (508) 371-3286 USA, email: tech-help@YandY.com, http://www.YandY.com
11 dict begin
/FontInfo 9 dict dup begin
/version (0.9) readonly def
/Notice ((c) 1993 Bigelow & Holmes Inc. Pat. Des. 289,420. All rights reserved.) readonly def
/Notice ((c) 1994 Y&Y Inc. All rights reserved.) readonly def
/FullName (Lucida Sans Unicode 21) readonly def
/FamilyName (LucidaSansUnicode) readonly def
/Weight (Normal) readonly def
/ItalicAngle 0 def
/isFixedPitch false def
/UnderlinePosition -100 def
/UnderlineThickness 50 def
end readonly def
/FontName /LucidaSansUnicode21 def
/PaintType 0 def
/FontType 1 def
/FontMatrix [0.001 0 0 0.001 0 0] readonly def
/Encoding 256 array
0 1 255 {1 index exch /.notdef put} for
dup 144 /2190 put
dup 145 /2191 put
dup 146 /2192 put
dup 147 /2193 put
dup 34 /2122 put
dup 49 /2131 put
readonly def
/FontBBox{-30 -325 1384 883}readonly def
%/UniqueID 5054521 def
currentdict end
currentfile eexec
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cleartomark
%%EndResource
%%BeginResource: font lsunr22
%!PS-AdobeFont-1.1: LucidaSansUnicode22 0.9
%%CreationDate: 1994 Jun 04 10:23:13
% Lucida is a registered trademark of Bigelow & Holmes Inc.
% NOTE:  This is a partial font in Adobe Type 1 format.
% The complete font in fully hinted ATM compatible form is available from Y&Y
% (508) 371-3286 USA, email: tech-help@YandY.com, http://www.YandY.com
11 dict begin
/FontInfo 9 dict dup begin
/version (0.9) readonly def
/Notice ((c) 1993 Bigelow & Holmes Inc. Pat. Des. 289,420. All rights reserved.) readonly def
/Notice ((c) 1994 Y&Y Inc. All rights reserved.) readonly def
/FullName (Lucida Sans Unicode 22) readonly def
/FamilyName (LucidaSansUnicode) readonly def
/Weight (Normal) readonly def
/ItalicAngle 0 def
/isFixedPitch false def
/UnderlinePosition -100 def
/UnderlineThickness 50 def
end readonly def
/FontName /LucidaSansUnicode22 def
/PaintType 0 def
/FontType 1 def
/FontMatrix [0.001 0 0 0.001 0 0] readonly def
/Encoding 256 array
0 1 255 {1 index exch /.notdef put} for
dup 100 /2264 put
dup 102 /2266 put
dup 103 /2267 put
dup 130 /2282 put
dup 131 /2283 put
dup 134 /2286 put
dup 135 /2287 put
dup 41 /2229 put
dup 42 /222a put
dup 43 /222b put
dup 67 /2243 put
dup 96 /2260 put
dup 97 /2261 put
dup 23 /2217 put
dup 25 /2219 put
dup 26 /221a put
dup 29 /221d put
dup 30 /221e put
dup 2 /2202 put
dup 5 /2205 put
dup 7 /2207 put
readonly def
/FontBBox{84 -166 1060 898}readonly def
%/UniqueID 5054522 def
currentdict end
currentfile eexec
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cleartomark
%%EndResource
%%BeginResource: font lsunr25
%!PS-AdobeFont-1.1: LucidaSansUnicode25 0.9
%%CreationDate: 1994 Jun 04 10:42:59
% Lucida is a registered trademark of Bigelow & Holmes Inc.
% NOTE:  This is a partial font in Adobe Type 1 format.
% The complete font in fully hinted ATM compatible form is available from Y&Y
% (508) 371-3286 USA, email: tech-help@YandY.com, http://www.YandY.com
11 dict begin
/FontInfo 9 dict dup begin
/version (0.9) readonly def
/Notice ((c) 1993 Bigelow & Holmes Inc. Pat. Des. 289,420. All rights reserved.) readonly def
/Notice ((c) 1994 Y&Y Inc. All rights reserved.) readonly def
/FullName (Lucida Sans Unicode 25) readonly def
/FamilyName (LucidaSansUnicode) readonly def
/Weight (Normal) readonly def
/ItalicAngle 0 def
/isFixedPitch false def
/UnderlinePosition -100 def
/UnderlineThickness 50 def
end readonly def
/FontName /LucidaSansUnicode25 def
/PaintType 0 def
/FontType 1 def
/FontMatrix [0.001 0 0 0.001 0 0] readonly def
/Encoding 256 array
0 1 255 {1 index exch /.notdef put} for
dup 161 /25a1 put
dup 202 /25ca put
dup 203 /25cb put
dup 230 /25e6 put
readonly def
/FontBBox{-26 -236 1026 815}readonly def
%/UniqueID 5054525 def
currentdict end
currentfile eexec
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cleartomark
%%EndResource
%%BeginResource: font lsi
%!PS-AdobeFont-1.1: LucidaSans-Italic 1.001
%%CreationDate: 1993 Aug 11 21:10:09
% Lucida is a registered trademark of Bigelow & Holmes Inc.
% NOTE:  This is a partial font in Adobe Type 1 format.
% The complete font in fully hinted ATM compatible form is available from Y&Y
% (508) 371-3286 USA, email: tech-help@YandY.com, http://www.YandY.com
11 dict begin
/FontInfo 9 dict dup begin
/version (1.001) readonly def
/Notice ((c) 1992 Bigelow & Holmes Inc. Pat. Des. 289,421. All rights reserved.) readonly def
/Notice ((c) 1992 by Y&Y Inc. All Rights Reserved.) readonly def
/FullName (Lucida Sans Italic) readonly def
/FamilyName (LucidaSans) readonly def
/Weight (Normal) readonly def
/ItalicAngle -11.3 def
/isFixedPitch false def
/UnderlinePosition -100 def
/UnderlineThickness 50 def
end readonly def
/FontName /LucidaSans-Italic def
/PaintType 0 def
/FontType 1 def
/FontMatrix [0.001 0 0 0.001 0 0] readonly def
/Encoding 256 array
0 1 255 {1 index exch /.notdef put} for
dup 54 /Aditi put
dup 39 /Alessio put
dup 41 /Ali put
dup 43 /Alois put
dup 173 /Ammar put
dup 47 /Andre put
dup 49 /Andrzej put
dup 51 /Angelika put
dup 53 /Anton put
dup 55 /Ari put
dup 33 /Arne put
dup 59 /Art put
dup 61 /Ayman put
dup 63 /Barry put
dup 65 /Bent put
dup 67 /Blair put
dup 69 /Bonnie put
dup 71 /Brian put
dup 73 /Burkhard put
dup 75 /Castor put
dup 77 /Charles put
dup 79 /Chi put
dup 81 /Christian put
dup 83 /Christoph put
dup 85 /Chuck put
dup 87 /Clovis put
dup 96 /Curt put
dup 89 /Cyrus put
dup 234 /Glen put
dup 189 /Heinz put
dup 56 /Jacqueline put
dup 57 /Jagannatha put
dup 58 /Jan put
dup 60 /Jason put
dup 32 /Jeff put
dup 62 /Jerzy put
dup 34 /Jim put
dup 64 /Jiri put
dup 36 /Joe put
dup 66 /Joel put
dup 38 /Johan put
dup 68 /John put
dup 40 /Johnnie put
dup 70 /Jon put
dup 42 /Jonas put
dup 72 /Jonathan put
dup 44 /Jorgen put
dup 74 /Jose put
dup 46 /Josh put
dup 76 /Juan put
dup 48 /Justin put
dup 78 /Kamal put
dup 50 /Karl put
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dup 82 /Kees put
dup 84 /Keith put
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dup 110 /Malka put
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dup 113 /Saul put
dup 115 /Saulius put
dup 117 /Scott put
dup 119 /Sean put
dup 121 /Sebastian put
dup 215 /Wilfred put
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readonly def
/FontBBox{-250 -211 1099 967}readonly def
%/UniqueID 5029007 def
currentdict end
currentfile eexec
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cleartomark
%%EndResource
%%BeginResource: font lsd
%!PS-AdobeFont-1.1: LucidaSans-Demi 1.001
%%CreationDate: 1993 Aug 11 21:10:03
% Lucida is a registered trademark of Bigelow & Holmes Inc.
% NOTE:  This is a partial font in Adobe Type 1 format.
% The complete font in fully hinted ATM compatible form is available from Y&Y
% (508) 371-3286 USA, email: tech-help@YandY.com, http://www.YandY.com
11 dict begin
/FontInfo 9 dict dup begin
/version (1.001) readonly def
/Notice ((c) 1992 Bigelow & Holmes Inc. All rights reserved. ) readonly def
/Notice ((c) 1992 by Y&Y Inc. All Rights Reserved.) readonly def
/FullName (Lucida Sans Demibold) readonly def
/FamilyName (LucidaSans) readonly def
/Weight (Demibold) readonly def
/ItalicAngle 0 def
/isFixedPitch false def
/UnderlinePosition -100 def
/UnderlineThickness 50 def
end readonly def
/FontName /LucidaSans-Demi def
/PaintType 0 def
/FontType 1 def
/FontMatrix [0.001 0 0 0.001 0 0] readonly def
/Encoding 256 array
0 1 255 {1 index exch /.notdef put} for
dup 54 /Aditi put
dup 39 /Alessio put
dup 41 /Ali put
dup 47 /Andre put
dup 49 /Andrzej put
dup 51 /Angelika put
dup 53 /Anton put
dup 55 /Ari put
dup 65 /Bent put
dup 67 /Blair put
dup 69 /Bonnie put
dup 71 /Brian put
dup 73 /Burkhard put
dup 75 /Castor put
dup 77 /Charles put
dup 79 /Chi put
dup 81 /Christian put
dup 83 /Christoph put
dup 85 /Chuck put
dup 87 /Clovis put
dup 89 /Cyrus put
dup 189 /Heinz put
dup 56 /Jacqueline put
dup 57 /Jagannatha put
dup 58 /Jan put
dup 32 /Jeff put
dup 66 /Joel put
dup 38 /Johan put
dup 68 /John put
dup 40 /Johnnie put
dup 70 /Jon put
dup 72 /Jonathan put
dup 44 /Jorgen put
dup 74 /Jose put
dup 46 /Josh put
dup 76 /Juan put
dup 48 /Justin put
dup 78 /Kamal put
dup 50 /Karl put
dup 80 /Karlheinz put
dup 52 /Kaspar put
dup 82 /Kees put
dup 84 /Keith put
dup 86 /Kenchi put
dup 88 /Kettleson put
dup 90 /Kieran put
dup 98 /Lalu put
dup 100 /Leon put
dup 102 /Louis put
dup 104 /Luc put
dup 106 /Lunjin put
dup 110 /Malka put
dup 112 /Manuel put
dup 108 /Marcy put
dup 114 /Mariusz put
dup 116 /Martin put
dup 118 /Masahiro put
dup 120 /Matt put
dup 122 /Maurizio put
dup 121 /Sebastian put
dup 97 /Roger put
dup 99 /Ron put
dup 101 /Rudi put
dup 103 /Russell put
dup 45 /Will put
dup 105 /Sam put
dup 107 /Sami put
dup 109 /Sanjay put
dup 111 /Saroj put
dup 113 /Saul put
dup 115 /Saulius put
dup 117 /Scott put
dup 119 /Sean put
readonly def
/FontBBox{-309 -205 1151 967}readonly def
%/UniqueID 5029006 def
currentdict end
currentfile eexec
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cleartomark
%%EndResource
%%BeginResource: font lbtr
%!PS-AdobeFont-1.1: LucidaTypewriter 1.001
%%CreationDate: 1994 Nov 12 10:47:10
% Lucida is a registered trademark of Bigelow & Holmes Inc.
% NOTE:  This is a partial font in Adobe Type 1 format.
% The complete font in fully hinted ATM compatible form is available from Y&Y
% (508) 371-3286 USA, email: tech-help@YandY.com, http://www.YandY.com
11 dict begin
/FontInfo 9 dict dup begin
/version (1.001) readonly def
/Notice ((c) 1993, 1994 Bigelow & Homes Inc. Pat. Des. 289,422. All Rights Reserved.) readonly def
/Notice ((c) 1994 Y&Y Inc. All Rights Reserved.) readonly def
/FullName (Lucida Typewriter) readonly def
/FamilyName (LucidaTypewriter) readonly def
/Weight (Medium) readonly def
/ItalicAngle 0 def
/isFixedPitch true def
/UnderlinePosition -100 def
/UnderlineThickness 50 def
end readonly def
/FontName /LucidaTypewriter def
/PaintType 0 def
/FontType 1 def
/FontMatrix [0.001 0 0 0.001 0 0] readonly def
/Encoding 256 array
0 1 255 {1 index exch /.notdef put} for
dup 54 /Aditi put
dup 35 /Ahmed put
dup 37 /Alasdair put
dup 39 /Alessio put
dup 41 /Ali put
dup 43 /Alois put
dup 173 /Ammar put
dup 47 /Andre put
dup 49 /Andrzej put
dup 51 /Angelika put
dup 53 /Anton put
dup 55 /Ari put
dup 33 /Arne put
dup 59 /Art put
dup 61 /Ayman put
dup 63 /Barry put
dup 65 /Bent put
dup 67 /Blair put
dup 69 /Bonnie put
dup 71 /Brian put
dup 73 /Burkhard put
dup 75 /Castor put
dup 77 /Charles put
dup 79 /Chi put
dup 81 /Christian put
dup 83 /Christoph put
dup 85 /Chuck put
dup 87 /Clovis put
dup 96 /Curt put
dup 89 /Cyrus put
dup 187 /Don put
dup 255 /George put
dup 189 /Heinz put
dup 179 /Hong put
dup 178 /Ivan put
dup 56 /Jacqueline put
dup 57 /Jagannatha put
dup 58 /Jan put
dup 60 /Jason put
dup 32 /Jeff put
dup 62 /Jerzy put
dup 34 /Jim put
dup 64 /Jiri put
dup 36 /Joe put
dup 66 /Joel put
dup 38 /Johan put
dup 68 /John put
dup 40 /Johnnie put
dup 70 /Jon put
dup 42 /Jonas put
dup 72 /Jonathan put
dup 44 /Jorgen put
dup 74 /Jose put
dup 46 /Josh put
dup 76 /Juan put
dup 48 /Justin put
dup 78 /Kamal put
dup 50 /Karl put
dup 80 /Karlheinz put
dup 52 /Kaspar put
dup 82 /Kees put
dup 84 /Keith put
dup 86 /Kenchi put
dup 252 /Kendall put
dup 88 /Kettleson put
dup 90 /Kieran put
dup 92 /Koen put
dup 94 /Kristian put
dup 98 /Lalu put
dup 100 /Leon put
dup 102 /Louis put
dup 104 /Luc put
dup 106 /Lunjin put
dup 110 /Malka put
dup 112 /Manuel put
dup 108 /Marcy put
dup 114 /Mariusz put
dup 116 /Martin put
dup 118 /Masahiro put
dup 120 /Matt put
dup 122 /Maurizio put
dup 124 /Max put
dup 126 /Michael put
dup 177 /Murad put
dup 91 /Robert put
dup 93 /Robin put
dup 95 /Rod put
dup 97 /Roger put
dup 99 /Ron put
dup 101 /Rudi put
dup 103 /Russell put
dup 105 /Sam put
dup 107 /Sami put
dup 109 /Sanjay put
dup 111 /Saroj put
dup 113 /Saul put
dup 115 /Saulius put
dup 117 /Scott put
dup 119 /Sean put
dup 121 /Sebastian put
dup 123 /Shuichi put
dup 125 /Stan put
dup 163 /Stefan put
dup 171 /Surendar put
dup 188 /Vladimir put
dup 45 /Will put
dup 247 /Waldo put
dup 215 /Wilfred put
readonly def
/FontBBox{0 -211 743 940}readonly def
%/UniqueID 5054489 def
currentdict end
currentfile eexec
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cleartomark
%%EndResource
%!PS-Adobe-2.0
%%Version: 0.1
%%Pages: (atend)
%%EndComments
%
% Version 3.3.2 prologue for troff files.
%

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/roundpage true def
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/R  /Times-Roman def
/I  /Times-Italic def
/B  /Times-Bold def
/BI /Times-BoldItalic def
/H  /Helvetica def
/HI /Helvetica-Oblique def
/HB /Helvetica-Bold def
/HX /Helvetica-BoldOblique def
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/Hi /Helvetica-Narrow-Oblique def
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/AI /AvantGarde-BookOblique def
/AB /AvantGarde-Demi def
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/NI /NewCenturySchlbk-Italic def
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/NX /NewCenturySchlbk-BoldItalic def
/ZD /ZapfDingbats def
/ZI /ZapfChancery-MediumItalic def
/S  /S def
/S1 /S1 def
/GR /Symbol def

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	scaling scaling scale

	addmetrics
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	userdict /gotpagebbox true put
} def

/addmetrics {
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} def

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	newencoding type /arraytype eq {newdict /Encoding newencoding put} if

	newdict /Metrics entries dict put
	newdict /Metrics get
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		1 1 entries {pop def} for
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} bind def

%
% A few arrays used to adjust reference points and character widths in some
% of the printer resident fonts. If square roots are too high try changing
% the lines describing /radical and /radicalex to,
%
%	/radical	[0 -75 550 0]
%	/radicalex	[-50 -75 500 0]
%
% Move braceleftbt a bit - default PostScript character is off a bit.
%

/Sdefs [
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	/bracketleftbt		[201 500]
	/bracketrighttp		[-81 380]
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	/braceleftbt		[203 490]
	/bracketrightex		[220 -125 500 0]
	/radical		[0 0 550 0]
	/radicalex		[-50 0 500 0]
	/parenleftex		[-20 -170 0 0]
	/integral		[100 -50 500 0]
	/infinity		[10 -75 730 0]
] def

/S1defs [
	/underscore		[0 80 500 0]
	/endash			[7 90 650 0]
] def
%
% Version 3.3.2 drawing procedures for dpost. Automatically pulled in when
% needed.
%

/inpath false def
/savematrix matrix def

/Dl {
	inpath
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	ifelse
} bind def

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		{newpath arc savematrix setmatrix stroke}
	ifelse
} bind def

/Da {
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		{arc}
		{newpath arc stroke}
	ifelse
} bind def

/DA {
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	/dy1 exch def
	/dx1 exch def
	dy1 add neg exch dx1 add exch
	dx1 dx1 mul dy1 dy1 mul add sqrt
	dy1 dx1 neg atan
	dy2 neg dx2 atan
	inpath
		{arcn}
		{newpath arcn stroke}
	ifelse
} bind def

/Ds {
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	/x2 exch def
	/y1 exch def
	/x1 exch def
	/y0 exch def
	/x0 exch def
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	y0 5 y1 mul add -6 div
	x2 5 x1 mul add 6 div
	y2 5 y1 mul add -6 div
	x1 x2 add 2 div
	y1 y2 add -2 div
	inpath
		{curveto}
		{newpath x0 x1 add 2 div y0 y1 add -2 div moveto curveto stroke}
	ifelse
} bind def
%
% Tries to round clipping path dimensions, as stored in array pagebbox, so they
% match one of the known sizes in the papersizes array. Lower left coordinates
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%
% Apparently no guarantee findfont is defined in systemdict so the obvious
%
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%
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setup
%%EndSetup
%%Page: 1 1
/saveobj save def
mark
1 pagesetup
12 /LucidaSans-Demi f
(Security) 2346 1230 w
(in Plan 9) 2879 1230 w
10 /LucidaSans-Italic f
(Russ Cox, MIT LCS) 2439 1470 w
(Eric Grosse, Bell Labs) 2364 1590 w
(Rob Pike, Bell Labs) 2428 1710 w
(Dave Presotto, Avaya Labs and Bell Labs) 1895 1830 w
(Sean Quinlan, Bell Labs) 2311 1950 w
10 /LucidaTypewriter f
({rsc,ehg,rob,presotto,seanq}@plan9.bell-labs.com) 1152 2070 w
10 /LucidaSans-Italic f
(ABSTRACT) 2626 2510 w
10 /LucidaSansUnicode00 f
(Abstract) 1330 2770 w
(The) 1778 2770 w
(security) 2004 2770 w
(architecture) 2428 2770 w
(of) 3051 2770 w
(the) 3194 2770 w
(Plan) 3394 2770 w
(9) 3640 2770 w
10 /LucidaSansUnicode21 f
(") 3703 2770 w
10 /LucidaSansUnicode00 f
(operating) 3829 2770 w
(system) 4340 2770 w
(has) 1080 2890 w
(recently) 1299 2890 w
(been) 1734 2890 w
(redesigned) 2022 2890 w
(to) 2612 2890 w
(address) 2761 2890 w
(some) 3192 2890 w
(technical) 3504 2890 w
(shortcomings.) 3987 2890 w
(This redesign provided an opportunity also to make the system more) 1080 3010 w
(con\255) 4473 3010 w
(venient) 1080 3130 w
(to) 1476 3130 w
(use) 1616 3130 w
(securely.) 1827 3130 w
(Plan) 2331 3130 w
(9) 2574 3130 w
(has) 2679 3130 w
(thus) 2889 3130 w
(improved) 3143 3130 w
(in) 3643 3130 w
(two) 3776 3130 w
(ways) 3993 3130 w
(not) 4270 3130 w
(usu\255) 4472 3130 w
(ally seen together: it has become more secure) 1080 3250 w
10 /LucidaSans-Italic f
(and) 3352 3250 w
10 /LucidaSansUnicode00 f
(easier to use.) 3568 3250 w
(The) 1080 3406 w
(central) 1333 3406 w
(component) 1736 3406 w
(of) 2354 3406 w
(the) 2524 3406 w
(new) 2751 3406 w
(architecture) 3018 3406 w
(is) 3668 3406 w
(a) 3820 3406 w
(per-user) 3948 3406 w
(self-) 4449 3406 w
(contained) 1080 3526 w
(agent) 1591 3526 w
(called) 1898 3526 w
10 /LucidaTypewriter f
(factotum) 2216 3526 w
10 /LucidaSansUnicode00 f
(.) 2792 3526 w
10 /LucidaTypewriter f
(Factotum) 2890 3526 w
10 /LucidaSansUnicode00 f
(securely) 3500 3526 w
(holds) 3932 3526 w
(a) 4232 3526 w
(copy) 4321 3526 w
(of) 4582 3526 w
(the) 1080 3646 w
(user) 1273 3646 w
10 /LucidaSansUnicode20 f
(\031) 1483 3646 w
10 /LucidaSansUnicode00 f
(s) 1515 3646 w
(keys) 1605 3646 w
(and) 1861 3646 w
(negotiates) 2080 3646 w
(authentication) 2625 3646 w
(protocols,) 3359 3646 w
(on) 3885 3646 w
(behalf) 4047 3646 w
(of) 4388 3646 w
(the) 4525 3646 w
(user,) 1080 3766 w
(with) 1376 3766 w
(secure) 1635 3766 w
(services) 2006 3766 w
(around) 2447 3766 w
(the) 2845 3766 w
(network.) 3054 3766 w
(Concentrating) 3564 3766 w
(security) 4301 3766 w
(code) 1080 3886 w
(in) 1366 3886 w
(a) 1512 3886 w
(single) 1622 3886 w
(program) 1966 3886 w
(offers) 2437 3886 w
(several) 2775 3886 w
(advantages) 3170 3886 w
(including:) 3773 3886 w
(ease) 4309 3886 w
(of) 4582 3886 w
(update) 1080 4006 w
(or) 1456 4006 w
(repair) 1597 4006 w
(to) 1921 4006 w
(broken) 2058 4006 w
(security) 2438 4006 w
(software) 2856 4006 w
(and) 3310 4006 w
(protocols;) 3529 4006 w
(the) 4055 4006 w
(ability) 4249 4006 w
(to) 4582 4006 w
(run) 1080 4126 w
(secure) 1298 4126 w
(services) 1668 4126 w
(at) 2108 4126 w
(a) 2253 4126 w
(lower) 2361 4126 w
(privilege) 2679 4126 w
(level;) 3150 4126 w
(uniform) 3458 4126 w
(management) 3897 4126 w
(of) 4582 4126 w
(keys) 1080 4246 w
(for) 1340 4246 w
(all) 1522 4246 w
(services;) 1678 4246 w
(and) 2140 4246 w
(an) 2363 4246 w
(opportunity) 2523 4246 w
(to) 3133 4246 w
(provide) 3273 4246 w
(single) 3680 4246 w
(sign) 4011 4246 w
(on,) 4257 4246 w
(even) 4454 4246 w
(to) 1080 4366 w
(unchanged) 1222 4366 w
(legacy) 1801 4366 w
(applications.) 2150 4366 w
10 /LucidaTypewriter f
(Factotum) 2843 4366 w
10 /LucidaSansUnicode00 f
(has) 3463 4366 w
(an) 3675 4366 w
(unusual) 3837 4366 w
(architec\255) 4265 4366 w
(ture: it is implemented as a Plan 9 file server.) 1080 4486 w
10 /LucidaSans-Demi f
(1.) 720 4846 w
(Introduction) 873 4846 w
10 /LucidaSansUnicode00 f
(Secure) 720 5002 w
(computing) 1089 5002 w
(systems) 1658 5002 w
(face) 2098 5002 w
(two) 2346 5002 w
(challenges:) 2570 5002 w
(first,) 3164 5002 w
(they) 3441 5002 w
(must) 3698 5002 w
(employ) 3991 5002 w
(sophisticated) 4395 5002 w
(technology) 720 5122 w
(that) 1293 5122 w
(is) 1524 5122 w
(difficult) 1644 5122 w
(to) 2058 5122 w
(design) 2196 5122 w
(and) 2559 5122 w
(prove) 2779 5122 w
(correct;) 3092 5122 w
(and) 3502 5122 w
(second,) 3722 5122 w
(they) 4138 5122 w
(must) 4385 5122 w
(be) 4668 5122 w
(easy) 4826 5122 w
(for) 720 5242 w
(regular) 894 5242 w
(people) 1275 5242 w
(to) 1638 5242 w
(use.) 1771 5242 w
(The) 2040 5242 w
(question) 2257 5242 w
(of) 2714 5242 w
(ease) 2848 5242 w
(of) 3102 5242 w
(use) 3236 5242 w
(is) 3441 5242 w
(sometimes) 3557 5242 w
(neglected,) 4120 5242 w
(but) 4660 5242 w
(it) 4858 5242 w
(is) 4960 5242 w
(essential:) 720 5362 w
(weak) 1255 5362 w
(but) 1577 5362 w
(easy-to-use) 1815 5362 w
(security) 2488 5362 w
(can) 2943 5362 w
(be) 3187 5362 w
(more) 3382 5362 w
(effective) 3709 5362 w
(than) 4196 5362 w
(strong) 4488 5362 w
(but) 4878 5362 w
(difficult-to-use) 720 5482 w
(security) 1526 5482 w
(if) 1954 5482 w
(it) 2069 5482 w
(is) 2184 5482 w
(more) 2314 5482 w
(likely) 2615 5482 w
(to) 2918 5482 w
(be) 3066 5482 w
(used.) 3235 5482 w
(People) 3581 5482 w
(lock) 3951 5482 w
(their) 4200 5482 w
(front) 4475 5482 w
(doors) 4763 5482 w
(when) 720 5602 w
(they leave the house, knowing full well that a burglar is capable of picking the lock) 1010 5602 w
(\(or) 720 5722 w
(avoiding) 896 5722 w
(the) 1350 5722 w
(door) 1546 5722 w
(altogether\);) 1813 5722 w
(yet) 2415 5722 w
(few) 2601 5722 w
(would) 2812 5722 w
(accept) 3145 5722 w
(the) 3499 5722 w
(cost) 3695 5722 w
(and) 3936 5722 w
(awkwardness) 4157 5722 w
(of) 4845 5722 w
(a) 4985 5722 w
(bank) 720 5842 w
(vault) 1002 5842 w
(door) 1281 5842 w
(on) 1551 5842 w
(the) 1717 5842 w
(house) 1915 5842 w
(even) 2250 5842 w
(though) 2519 5842 w
(that) 2908 5842 w
(might) 3142 5842 w
(reduce) 3468 5842 w
(the) 3840 5842 w
(probability) 4038 5842 w
(of) 4603 5842 w
(a) 4744 5842 w
(rob\255) 4842 5842 w
(bery.) 720 5962 w
(A) 1038 5962 w
(related) 1149 5962 w
(point) 1528 5962 w
(is) 1822 5962 w
(that) 1944 5962 w
(users) 2177 5962 w
(need) 2480 5962 w
(a) 2759 5962 w
(clear) 2856 5962 w
(model) 3130 5962 w
(of) 3474 5962 w
(how) 3615 5962 w
(the) 3858 5962 w
(security) 4056 5962 w
(operates) 4478 5962 w
(\(if) 4941 5962 w
(not) 720 6082 w
(how) 916 6082 w
(it) 1152 6082 w
(actually) 1254 6082 w
(provides) 1660 6082 w
(security\)) 2112 6082 w
(in) 2560 6082 w
(order) 2686 6082 w
(to) 2983 6082 w
(use) 3116 6082 w
(it) 3320 6082 w
(well;) 3421 6082 w
(for) 3679 6082 w
(example,) 3853 6082 w
(the) 4333 6082 w
(clarity) 4523 6082 w
(of) 4852 6082 w
(a) 4985 6082 w
(lock) 720 6202 w
(icon) 963 6202 w
(on) 1210 6202 w
(a) 1377 6202 w
(web) 1476 6202 w
(browser) 1716 6202 w
(is) 2150 6202 w
(offset) 2274 6202 w
(by) 2597 6202 w
(the) 2756 6202 w
(confusing) 2956 6202 w
(and) 3478 6202 w
(typically) 3703 6202 w
(insecure) 4145 6202 w
(steps) 4598 6202 w
(for) 4901 6202 w
(installing X.509 certificates.) 720 6322 w
(The) 720 6478 w
(security) 957 6478 w
(architecture) 1392 6478 w
(of) 2026 6478 w
(the) 2180 6478 w
(Plan) 2392 6478 w
(9) 2650 6478 w
(operating) 2770 6478 w
(system) 3293 6478 w
([Pike95]) 3690 6478 w
(has) 4137 6478 w
(recently) 4362 6478 w
(been) 4803 6478 w
(redesigned) 720 6598 w
(to) 1301 6598 w
(make) 1441 6598 w
(it) 1745 6598 w
(both) 1853 6598 w
(more) 2118 6598 w
(secure) 2410 6598 w
(and) 2768 6598 w
(easier) 2989 6598 w
(to) 3318 6598 w
(use.) 3457 6598 w
(By) 3731 6598 w
10 /LucidaSans-Italic f
(security) 3882 6598 w
10 /LucidaSansUnicode00 f
(we) 4307 6598 w
(mean) 4481 6598 w
(three) 4788 6598 w
(things:) 720 6718 w
(first,) 1103 6718 w
(the) 1378 6718 w
(business) 1581 6718 w
(of) 2054 6718 w
(authenticating) 2200 6718 w
(users) 2944 6718 w
(and) 3254 6718 w
(services;) 3483 6718 w
(second,) 3951 6718 w
(the) 4376 6718 w
(safe) 4580 6718 w
(han\255) 4828 6718 w
(dling,) 720 6838 w
(deployment,) 1039 6838 w
(and) 1685 6838 w
(use) 1907 6838 w
(of) 2118 6838 w
(keys) 2258 6838 w
(and) 2517 6838 w
(other) 2739 6838 w
(secret) 3037 6838 w
(information;) 3370 6838 w
(and) 4010 6838 w
(third,) 4231 6838 w
(the) 4536 6838 w
(use) 4732 6838 w
(of) 4942 6838 w
8 /S1 f
(__________________) 720 6938 w
8 /LucidaSansUnicode00 f
(To) 720 7038 w
(appear,) 871 7038 w
(in) 1215 7038 w
(a) 1340 7038 w
(slightly) 1436 7038 w
(different) 1770 7038 w
(form,) 2158 7038 w
(in) 2422 7038 w
8 /LucidaSans-Italic f
(Proc.) 2547 7038 w
(of) 2795 7038 w
(the) 2923 7038 w
(2002) 3097 7038 w
(Usenix) 3349 7038 w
(Security) 3653 7038 w
(Symposium,) 4016 7038 w
(San) 4537 7038 w
(Francisco.) 720 7138 w
cleartomark
showpage
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/saveobj save def
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2 pagesetup
10 /LucidaSansUnicode00 f
(\255 2 \255) 2783 480 w
(encryption and integrity checks to safeguard communications from prying eyes.) 720 840 w
(The) 720 996 w
(old) 951 996 w
(security) 1154 996 w
(architecture) 1583 996 w
(of) 2211 996 w
(Plan) 2359 996 w
(9) 2610 996 w
(had) 2723 996 w
(several) 2953 996 w
(engineering) 3343 996 w
(problems) 3970 996 w
(in) 4477 996 w
(common) 4619 996 w
(with) 720 1116 w
(other) 976 1116 w
(operating) 1284 1116 w
(systems.) 1801 1116 w
(First,) 2307 1116 w
(it) 2602 1116 w
(had) 2719 1116 w
(an) 2950 1116 w
(inadequate) 3118 1116 w
(notion) 3706 1116 w
(of) 4068 1116 w
(security) 4216 1116 w
(domain.) 4645 1116 w
(Once) 720 1236 w
(a) 1011 1236 w
(user) 1110 1236 w
(provided) 1364 1236 w
(a) 1837 1236 w
(password) 1937 1236 w
(to) 2444 1236 w
(connect) 2587 1236 w
(to) 3012 1236 w
(a) 3155 1236 w
(local) 3255 1236 w
(file) 3525 1236 w
(store,) 3721 1236 w
(the) 4044 1236 w
(system) 4244 1236 w
(required) 4629 1236 w
(that) 720 1356 w
(the) 951 1356 w
(same) 1146 1356 w
(password) 1441 1356 w
(be) 1943 1356 w
(used) 2102 1356 w
(to) 2374 1356 w
(access) 2512 1356 w
(all) 2867 1356 w
(the) 3019 1356 w
(other) 3213 1356 w
(file) 3509 1356 w
(stores.) 3699 1356 w
(That) 4099 1356 w
(is,) 4355 1356 w
(the) 4506 1356 w
(system) 4700 1356 w
(treated all network services as belonging to the same security domain.) 720 1476 w
(Second,) 720 1632 w
(the) 1138 1632 w
(algorithms) 1332 1632 w
(and) 1891 1632 w
(protocols) 2111 1632 w
(used) 2606 1632 w
(in) 2878 1632 w
(authentication,) 3009 1632 w
(by) 3776 1632 w
(nature) 3931 1632 w
(tricky) 4284 1632 w
(and) 4592 1632 w
(diffi\255) 4812 1632 w
(cult) 720 1752 w
(to) 942 1752 w
(get) 1083 1752 w
(right,) 1281 1752 w
(were) 1587 1752 w
(compiled) 1860 1752 w
(into) 2348 1752 w
(the) 2580 1752 w
(various) 2778 1752 w
(applications,) 3172 1752 w
(kernel) 3832 1752 w
(modules,) 4177 1752 w
(and) 4667 1752 w
(file) 4889 1752 w
(servers.) 720 1872 w
(Changes) 1178 1872 w
(and) 1642 1872 w
(fixes) 1869 1872 w
(to) 2150 1872 w
(a) 2295 1872 w
(security) 2397 1872 w
(protocol) 2823 1872 w
(required) 3274 1872 w
(that) 3732 1872 w
(all) 3970 1872 w
(components) 4130 1872 w
(using) 4774 1872 w
(that protocol needed to be recompiled, or at least relinked, and restarted.) 720 1992 w
(Third,) 720 2148 w
(the) 1048 2148 w
(file) 1241 2148 w
(transport) 1430 2148 w
(protocol,) 1916 2148 w
(9P) 2390 2148 w
([Pike93],) 2546 2148 w
(that) 3006 2148 w
(forms) 3235 2148 w
(the) 3556 2148 w
(core) 3749 2148 w
(of) 3996 2148 w
(the) 4132 2148 w
(Plan) 4326 2148 w
(9) 4566 2148 w
(system,) 4668 2148 w
(had) 720 2268 w
(its) 962 2268 w
(authentication) 1141 2268 w
(protocol) 1898 2268 w
(embedded) 2363 2268 w
(in) 2937 2268 w
(its) 3089 2268 w
(design.) 3267 2268 w
(This) 3715 2268 w
(meant) 3981 2268 w
(that) 4345 2268 w
(fixing) 4597 2268 w
(or) 4938 2268 w
(changing) 720 2388 w
(the) 1203 2388 w
(authentication) 1396 2388 w
(used) 2129 2388 w
(by) 2399 2388 w
(9P) 2552 2388 w
(required) 2708 2388 w
(deep) 3157 2388 w
(changes) 3433 2388 w
(to) 3870 2388 w
(the) 4006 2388 w
(system.) 4199 2388 w
(If) 4641 2388 w
(some\255) 4746 2388 w
(one) 720 2508 w
(were) 939 2508 w
(to) 1209 2508 w
(find) 1347 2508 w
(a) 1578 2508 w
(way) 1672 2508 w
(to) 1895 2508 w
(break) 2032 2508 w
(the) 2344 2508 w
(protocol,) 2538 2508 w
(the) 3013 2508 w
(system) 3207 2508 w
(would) 3586 2508 w
(be) 3917 2508 w
(wide) 4075 2508 w
(open) 4339 2508 w
(and) 4620 2508 w
(very) 4839 2508 w
(hard to fix.) 720 2628 w
(These) 720 2784 w
(and) 1051 2784 w
(a) 1275 2784 w
(number) 1374 2784 w
(of) 1795 2784 w
(lesser) 1937 2784 w
(problems,) 2265 2784 w
(combined) 2798 2784 w
(with) 3320 2784 w
(a) 3569 2784 w
(desire) 3668 2784 w
(for) 4008 2784 w
(more) 4191 2784 w
(widespread) 4486 2784 w
(use) 720 2904 w
(of) 925 2904 w
(encryption) 1059 2904 w
(in) 1609 2904 w
(the) 1736 2904 w
(system,) 1927 2904 w
(spurred) 2335 2904 w
(us) 2748 2904 w
(to) 2896 2904 w
(rethink) 3029 2904 w
(the) 3409 2904 w
(entire) 3599 2904 w
(security) 3915 2904 w
(architecture) 4329 2904 w
(of) 4942 2904 w
(Plan 9.) 720 3024 w
(The) 720 3180 w
(centerpiece) 934 3180 w
(of) 1525 3180 w
(the) 1656 3180 w
(new) 1845 3180 w
(architecture) 2074 3180 w
(is) 2686 3180 w
(an) 2800 3180 w
(agent,) 2951 3180 w
(called) 3289 3180 w
10 /LucidaTypewriter f
(factotum) 3606 3180 w
10 /LucidaSansUnicode00 f
(,) 4182 3180 w
(that) 4248 3180 w
(handles) 4473 3180 w
(the) 4885 3180 w
(user) 720 3300 w
10 /LucidaSansUnicode20 f
(\031) 930 3300 w
10 /LucidaSansUnicode00 f
(s) 962 3300 w
(keys) 1065 3300 w
(and) 1334 3300 w
(negotiates) 1566 3300 w
(all) 2124 3300 w
(security) 2289 3300 w
(interactions) 2720 3300 w
(with) 3343 3300 w
(system) 3600 3300 w
(services) 3992 3300 w
(and) 4431 3300 w
(applica\255) 4662 3300 w
(tions.) 720 3420 w
(Like) 1057 3420 w
(a) 1286 3420 w
(trusted) 1374 3420 w
(houseboy) 1754 3420 w
(with) 2256 3420 w
(a) 2495 3420 w
(copy) 2584 3420 w
(of) 2845 3420 w
(the) 2977 3420 w
(owner) 3166 3420 w
10 /LucidaSansUnicode20 f
(\031) 3463 3420 w
10 /LucidaSansUnicode00 f
(s) 3495 3420 w
(keys,) 3580 3420 w
10 /LucidaTypewriter f
(factotum) 3863 3420 w
10 /LucidaSansUnicode00 f
(does) 4473 3420 w
(all) 4738 3420 w
(the) 4885 3420 w
(negotiation) 720 3540 w
(for) 1319 3540 w
(security) 1506 3540 w
(and) 1933 3540 w
(authentication.) 2160 3540 w
(Programs) 2966 3540 w
(no) 3472 3540 w
(longer) 3642 3540 w
(need) 4000 3540 w
(to) 4284 3540 w
(be) 4429 3540 w
(compiled) 4595 3540 w
(with) 720 3660 w
(cryptographic) 963 3660 w
(code;) 1670 3660 w
(instead) 1972 3660 w
(they) 2364 3660 w
(communicate) 2610 3660 w
(with) 3299 3660 w
10 /LucidaTypewriter f
(factotum) 3543 3660 w
10 /LucidaSansUnicode00 f
(agents) 4158 3660 w
(that) 4520 3660 w
(repre\255) 4750 3660 w
(sent) 720 3780 w
(distinct) 981 3780 w
(entities) 1395 3780 w
(in) 1807 3780 w
(the) 1953 3780 w
(cryptographic) 2162 3780 w
(exchange,) 2884 3780 w
(such) 3435 3780 w
(as) 3715 3780 w
(a) 3875 3780 w
(user) 3984 3780 w
(and) 4248 3780 w
(server) 4482 3780 w
(of) 4833 3780 w
(a) 4985 3780 w
(secure) 720 3900 w
(service.) 1090 3900 w
(If) 1544 3900 w
(a) 1664 3900 w
(security) 1773 3900 w
(protocol) 2206 3900 w
(needs) 2664 3900 w
(to) 3006 3900 w
(be) 3158 3900 w
(added,) 3331 3900 w
(deleted,) 3717 3900 w
(or) 4163 3900 w
(modified,) 4319 3900 w
(only) 4836 3900 w
10 /LucidaTypewriter f
(factotum) 720 4020 w
10 /LucidaSansUnicode00 f
(needs to be updated for all system services to be kept secure.) 1328 4020 w
(Building) 720 4176 w
(on) 1178 4176 w
10 /LucidaTypewriter f
(factotum) 1365 4176 w
10 /LucidaSansUnicode00 f
(,) 1941 4176 w
(we) 2037 4176 w
(modified) 2234 4176 w
(secure) 2729 4176 w
(services) 3110 4176 w
(in) 3561 4176 w
(the) 3716 4176 w
(system) 3935 4176 w
(to) 4340 4176 w
(move) 4503 4176 w
(user) 4830 4176 w
(authentication) 720 4296 w
(code) 1467 4296 w
(into) 1750 4296 w
10 /LucidaTypewriter f
(factotum) 1991 4296 w
10 /LucidaSansUnicode00 f
(;) 2567 4296 w
(made) 2651 4296 w
(authentication) 2970 4296 w
(a) 3717 4296 w
(separable) 3824 4296 w
(component) 4345 4296 w
(of) 4942 4296 w
(the) 720 4416 w
(file) 919 4416 w
(server) 1114 4416 w
(protocol;) 1455 4416 w
(deployed) 1935 4416 w
(new) 2422 4416 w
(security) 2661 4416 w
(protocols;) 3085 4416 w
(designed) 3617 4416 w
(a) 4104 4416 w
(secure) 4204 4416 w
(file) 4566 4416 w
(store,) 4762 4416 w
(called) 720 4536 w
10 /LucidaTypewriter f
(secstore) 1064 4536 w
10 /LucidaSansUnicode00 f
(,) 1640 4536 w
(to) 1733 4536 w
(protect) 1892 4536 w
(our) 2299 4536 w
(keys) 2524 4536 w
(but) 2802 4536 w
(make) 3025 4536 w
(them) 3348 4536 w
(easy) 3657 4536 w
(to) 3931 4536 w
(get) 4089 4536 w
(when) 4304 4536 w
(they) 4621 4536 w
(are) 4888 4536 w
(needed;) 720 4656 w
(designed) 1153 4656 w
(a) 1640 4656 w
(new) 1740 4656 w
(kernel) 1980 4656 w
(module) 2327 4656 w
(to) 2736 4656 w
(support) 2879 4656 w
(transparent) 3302 4656 w
(use) 3907 4656 w
(of) 4121 4656 w
(Transport) 4264 4656 w
(Layer) 4783 4656 w
(Security) 720 4776 w
(\(TLS\)) 1140 4776 w
([RFC2246];) 1413 4776 w
(and) 1986 4776 w
(began) 2203 4776 w
(using) 2538 4776 w
(encryption) 2841 4776 w
(for) 3392 4776 w
(all) 3568 4776 w
(communications) 3718 4776 w
(within) 4552 4776 w
(the) 4885 4776 w
(system.) 720 4896 w
(The overall architecture is illustrated in Figure 1a.) 1156 4896 w
(Secure) 720 5052 w
(protocols) 1087 5052 w
(and) 1589 5052 w
(algorithms) 1816 5052 w
(are) 2383 5052 w
(well) 2582 5052 w
(understood) 2820 5052 w
(and) 3424 5052 w
(are) 3651 5052 w
(usually) 3851 5052 w
(not) 4239 5052 w
(the) 4447 5052 w
(weakest) 4650 5052 w
(link) 720 5172 w
(in) 964 5172 w
(a) 1120 5172 w
(system) 1240 5172 w
10 /LucidaSansUnicode20 f
(\031) 1580 5172 w
10 /LucidaSansUnicode00 f
(s) 1612 5172 w
(security.) 1728 5172 w
(In) 2236 5172 w
(practice,) 2392 5172 w
(most) 2872 5172 w
(security) 3179 5172 w
(problems) 3623 5172 w
(arise) 4145 5172 w
(from) 4442 5172 w
(buggy) 4739 5172 w
(servers,) 720 5292 w
(confusing) 1138 5292 w
(software,) 1653 5292 w
(or) 2138 5292 w
(administrative) 2278 5292 w
(oversights.) 3005 5292 w
(It) 3609 5292 w
(is) 3713 5292 w
(these) 3832 5292 w
(practical) 4133 5292 w
(problems) 4583 5292 w
(that) 720 5412 w
(we) 948 5412 w
(are) 1118 5412 w
(addressing.) 1307 5412 w
(Although) 1941 5412 w
(this) 2422 5412 w
(paper) 2638 5412 w
(describes) 2953 5412 w
(the) 3451 5412 w
(algorithms) 3643 5412 w
(and) 4200 5412 w
(protocols) 4416 5412 w
(we) 4907 5412 w
(are) 720 5532 w
(using,) 909 5532 w
(they) 1244 5532 w
(are) 1488 5532 w
(included) 1677 5532 w
(mainly) 2130 5532 w
(for) 2488 5532 w
(concreteness.) 2665 5532 w
(Instead,) 3402 5532 w
(our) 3825 5532 w
(focus) 4027 5532 w
(is) 4327 5532 w
(to) 4445 5532 w
(present) 4581 5532 w
(a) 4985 5532 w
(simple) 720 5652 w
(security) 1085 5652 w
(architecture) 1508 5652 w
(built) 2130 5652 w
(upon) 2394 5652 w
(a) 2686 5652 w
(small) 2785 5652 w
(trusted) 3086 5652 w
(code) 3476 5652 w
(base) 3750 5652 w
(that) 4018 5652 w
(is) 4252 5652 w
(easy) 4375 5652 w
(to) 4632 5652 w
(verify) 4773 5652 w
(\(whether by manual or automatic means\), easy to understand, and easy to use.) 720 5772 w
(Although) 720 5928 w
(it) 1200 5928 w
(is) 1302 5928 w
(a) 1418 5928 w
(subjective) 1510 5928 w
(assessment,) 2034 5928 w
(we) 2666 5928 w
(believe) 2836 5928 w
(we) 3214 5928 w
(have) 3384 5928 w
(achieved) 3646 5928 w
(our) 4107 5928 w
(goal) 4308 5928 w
(of) 4552 5928 w
(ease) 4687 5928 w
(of) 4942 5928 w
(use.) 720 6048 w
(That) 995 6048 w
(we) 1254 6048 w
(have) 1429 6048 w
(achieved) 1696 6048 w
(our) 2161 6048 w
(goal) 2366 6048 w
(of) 2614 6048 w
(improved) 2753 6048 w
(security) 3252 6048 w
(is) 3672 6048 w
(supported) 3793 6048 w
(by) 4331 6048 w
(our) 4487 6048 w
(plan) 4692 6048 w
(to) 4942 6048 w
(move) 720 6168 w
(our) 1020 6168 w
(currently) 1222 6168 w
(private) 1691 6168 w
(computing) 2062 6168 w
(environment) 2620 6168 w
(onto) 3269 6168 w
(the) 3528 6168 w
(Internet) 3721 6168 w
(outside) 4139 6168 w
(the) 4536 6168 w
(corpo\255) 4730 6168 w
(rate) 720 6288 w
(firewall.) 961 6288 w
(The) 1429 6288 w
(rest) 1661 6288 w
(of) 1897 6288 w
(this) 2046 6288 w
(paper) 2276 6288 w
(explains) 2605 6288 w
(the) 3062 6288 w
(architecture) 3268 6288 w
(and) 3897 6288 w
(how) 4128 6288 w
(it) 4379 6288 w
(is) 4496 6288 w
(used,) 4627 6288 w
(to) 4942 6288 w
(explain) 720 6408 w
(why) 1110 6408 w
(a) 1336 6408 w
(system) 1426 6408 w
(that) 1801 6408 w
(is) 2027 6408 w
(easy) 2142 6408 w
(to) 2391 6408 w
(use) 2524 6408 w
(securely) 2728 6408 w
(is) 3161 6408 w
(also) 3277 6408 w
(safe) 3509 6408 w
(enough) 3744 6408 w
(to) 4145 6408 w
(run) 4279 6408 w
(in) 4480 6408 w
(the) 4607 6408 w
(open) 4798 6408 w
(network.) 720 6528 w
10 /LucidaSans-Demi f
(2.) 720 6768 w
(An Agent for Security) 873 6768 w
10 /LucidaSansUnicode00 f
(One) 720 6924 w
(of) 953 6924 w
(the) 1088 6924 w
(primary) 1280 6924 w
(reasons) 1692 6924 w
(for) 2107 6924 w
(the) 2284 6924 w
(redesign) 2477 6924 w
(of) 2935 6924 w
(the) 3071 6924 w
(Plan) 3264 6924 w
(9) 3503 6924 w
(security) 3604 6924 w
(infrastructure) 4021 6924 w
(was) 4721 6924 w
(to) 4942 6924 w
(remove) 720 7044 w
(the) 1138 7044 w
(authentication) 1352 7044 w
(method) 2106 7044 w
(both) 2537 7044 w
(from) 2819 7044 w
(the) 3109 7044 w
(applications) 3322 7044 w
(and) 3965 7044 w
(from) 4203 7044 w
(the) 4493 7044 w
(kernel.) 4706 7044 w
(Cryptographic) 720 7164 w
(code) 1446 7164 w
(is) 1717 7164 w
(large) 1837 7164 w
(and) 2120 7164 w
(intricate,) 2341 7164 w
(so) 2811 7164 w
(it) 2964 7164 w
(should) 3071 7164 w
(be) 3440 7164 w
(packaged) 3600 7164 w
(as) 4104 7164 w
(a) 4251 7164 w
(separate) 4347 7164 w
(com\255) 4802 7164 w
(ponent) 720 7284 w
(that) 1102 7284 w
(can) 1334 7284 w
(be) 1543 7284 w
(repaired) 1703 7284 w
(or) 2148 7284 w
(modified) 2291 7284 w
(without) 2763 7284 w
(altering) 3168 7284 w
(or) 3579 7284 w
(even) 3721 7284 w
(relinking) 3987 7284 w
(applications) 4455 7284 w
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10 /LucidaSansUnicode00 f
(\255 3 \255) 2783 480 w
2044 1104 2044 882 Dl
2044 882 2622 882 Dl
2623 882 2623 1104 Dl
2623 1104 2045 1104 Dl
(Secstore) 2131 1013 w
2134 1639 2134 1194 Dl
2134 1193 2623 1193 Dl
2623 1193 2623 1638 Dl
2623 1639 2134 1639 Dl
8 /LucidaSansUnicode00 f
(Terminal) 2207 1725 w
2427 1285 177 133 De
9 /LucidaSans-Italic f
(F) 2465 1305 w
6 /LucidaSans-Italic f
(T) 2524 1323 w
2183 1478 267 200 De
9 /LucidaSans-Italic f
(P) 2264 1498 w
6 /LucidaSans-Italic f
(T) 2326 1516 w
3470 1639 3470 1194 Dl
3470 1193 3959 1193 Dl
3960 1193 3960 1638 Dl
3960 1639 3471 1639 Dl
8 /LucidaSansUnicode00 f
(CPU) 3505 1725 w
(Server) 3685 1725 w
3488 1285 177 133 De
9 /LucidaSans-Italic f
(F) 3524 1305 w
6 /LucidaSans-Italic f
(C) 3583 1323 w
3643 1478 267 200 De
9 /LucidaSans-Italic f
(P) 3721 1498 w
6 /LucidaSans-Italic f
(C) 3783 1516 w
2044 2129 2066 2129 Dl
2091 2129 2113 2129 Dl
2137 2129 2159 2129 Dl
2184 2129 2206 2129 Dl
2230 2129 2252 2129 Dl
2276 2129 2298 2129 Dl
2323 2129 2345 2129 Dl
2369 2129 2391 2129 Dl
2416 2129 2438 2129 Dl
2462 2129 2484 2129 Dl
2509 2129 2531 2129 Dl
2555 2129 2577 2129 Dl
2601 2129 2623 2129 Dl
2623 2129 2623 2107 Dl
2623 2078 2623 2056 Dl
2623 2028 2623 2006 Dl
2623 1978 2623 1956 Dl
2623 1928 2623 1906 Dl
2623 1906 2601 1906 Dl
2577 1906 2555 1906 Dl
2530 1906 2508 1906 Dl
2484 1906 2462 1906 Dl
2438 1906 2416 1906 Dl
2391 1906 2369 1906 Dl
2345 1906 2323 1906 Dl
2298 1906 2276 1906 Dl
2252 1906 2230 1906 Dl
2206 1906 2184 1906 Dl
2160 1906 2138 1906 Dl
2113 1906 2091 1906 Dl
2067 1906 2045 1906 Dl
2044 1906 2044 1928 Dl
2044 1956 2044 1978 Dl
2044 2006 2044 2028 Dl
2044 2056 2044 2078 Dl
2044 2106 2044 2128 Dl
10 /LucidaSansUnicode00 f
(Auth Server) 2053 2037 w
3470 2306 3470 1861 Dl
3470 1861 3959 1861 Dl
3960 1861 3960 2306 Dl
3960 2306 3471 2306 Dl
8 /LucidaSansUnicode00 f
(File) 3515 2393 w
(Server) 3675 2393 w
3488 1953 177 133 De
9 /LucidaSans-Italic f
(F) 3528 1973 w
6 /LucidaSans-Italic f
(F) 3587 1991 w
3643 2147 267 200 De
9 /LucidaSans-Italic f
(P) 3726 2167 w
6 /LucidaSans-Italic f
(F) 3788 2185 w
2450 1457 3641 1457 Dl
2450 1501 2450 1501 2895 1501 Ds
2450 1501 2895 1501 3117 2169 Ds
2895 1501 3117 2169 3339 2169 Ds
3117 2169 3339 2169 3639 2169 Ds
3339 2169 3639 2169 3639 2169 Ds
3643 1501 3643 1501 3154 1501 Ds
3643 1501 3154 1501 3154 2124 Ds
3154 1501 3154 2124 3376 2124 Ds
3154 2124 3376 2124 3643 2124 Ds
3376 2124 3643 2124 3643 2124 Ds
3672 1366 3642 1333 Dl
3652 1377 3641 1333 Dl
3640 1332 3681 1407 Dl
3651 1374 3681 1407 Dl
3670 1363 3681 1407 Dl
2441 1377 2452 1333 Dl
2422 1366 2452 1333 Dl
2453 1332 2412 1407 Dl
2423 1363 2412 1407 Dl
2442 1374 2412 1407 Dl
3672 2034 3642 2001 Dl
3652 2045 3641 2001 Dl
3640 2000 3681 2075 Dl
3651 2042 3681 2075 Dl
3670 2031 3681 2075 Dl
2668 982 2624 992 Dl
2668 1004 2624 994 Dl
2623 993 2623 993 2845 993 Ds
2623 993 2845 993 2845 1284 Ds
2845 993 2845 1284 2623 1284 Ds
2845 1284 2623 1284 2605 1284 Ds
2623 1284 2605 1284 2605 1284 Ds
2649 1272 2606 1284 Dl
2650 1295 2606 1285 Dl
9 /LucidaSansUnicode00 f
(Figure) 720 2587 w
(1a.) 1032 2587 w
(Components) 1235 2587 w
(of) 1827 2587 w
(the) 1953 2587 w
(security) 2131 2587 w
(architecture.) 2511 2587 w
(Each) 3128 2587 w
(box) 3368 2587 w
(is) 3574 2587 w
(a) 3685 2587 w
(\(typically\)) 3774 2587 w
(separate) 4231 2587 w
(machine;) 4643 2587 w
(each) 720 2687 w
(ellipse) 963 2687 w
(a) 1285 2687 w
(process.) 1376 2687 w
(The) 1812 2687 w
(ellipses) 2016 2687 w
(labeled) 2383 2687 w
9 /LucidaSans-Italic f
(F) 2739 2687 w
6 /LucidaSans-Italic f
(X) 2798 2705 w
9 /LucidaSansUnicode00 f
(are) 2882 2687 w
9 /LucidaTypewriter f
(factotum) 3059 2687 w
9 /LucidaSansUnicode00 f
(processes;) 3619 2687 w
(those) 4121 2687 w
(labeled) 4401 2687 w
9 /LucidaSans-Italic f
(P) 4757 2687 w
6 /LucidaSans-Italic f
(X) 4819 2705 w
9 /LucidaSansUnicode00 f
(are) 4903 2687 w
(the) 720 2787 w
(pieces) 907 2787 w
(and) 1230 2787 w
(proxies) 1442 2787 w
(of) 1817 2787 w
(a) 1954 2787 w
(distributed) 2053 2787 w
(program.) 2580 2787 w
(The) 3063 2787 w
(authentication) 3275 2787 w
(server) 3950 2787 w
(is) 4266 2787 w
(one) 4387 2787 w
(of) 4597 2787 w
(several) 4734 2787 w
(repositories) 720 2887 w
(for) 1301 2887 w
(users) 1489 2887 w
9 /LucidaSansUnicode20 f
(\031) 1724 2887 w
9 /LucidaSansUnicode00 f
(security) 1816 2887 w
(information) 2219 2887 w
(that) 2792 2887 w
9 /LucidaTypewriter f
(factotum) 3026 2887 w
9 /LucidaSansUnicode00 f
(processes) 3608 2887 w
(consult) 4103 2887 w
(as) 4483 2887 w
(required.) 4641 2887 w
9 /LucidaTypewriter f
(Secstore) 720 2987 w
9 /LucidaSansUnicode00 f
(is) 1280 2987 w
(a) 1392 2987 w
(shared) 1482 2987 w
(resource) 1818 2987 w
(for) 2236 2987 w
(storing) 2402 2987 w
(private) 2752 2987 w
(information) 3093 2987 w
(such) 3645 2987 w
(as) 3890 2987 w
(keys;) 4027 2987 w
9 /LucidaTypewriter f
(factotum) 4292 2987 w
9 /LucidaSansUnicode00 f
(con\255) 4853 2987 w
(sults) 720 3087 w
(it) 956 3087 w
(for) 1044 3087 w
(the) 1198 3087 w
(user) 1366 3087 w
(during) 1584 3087 w
(bootstrap.) 1901 3087 w
10 /LucidaSansUnicode00 f
(and) 720 3307 w
(services) 944 3307 w
(that) 1375 3307 w
(depend) 1610 3307 w
(on) 2017 3307 w
(it.) 2184 3307 w
(If) 2358 3307 w
(a) 2468 3307 w
(security) 2567 3307 w
(protocol) 2990 3307 w
(is) 3438 3307 w
(broken,) 3562 3307 w
(it) 3979 3307 w
(should) 4089 3307 w
(be) 4461 3307 w
(trivial) 4625 3307 w
(to) 4942 3307 w
(repair,) 720 3427 w
(disable,) 1074 3427 w
(or) 1489 3427 w
(replace) 1628 3427 w
(it) 2016 3427 w
(on) 2119 3427 w
(the) 2279 3427 w
(fly.) 2471 3427 w
(Similarly,) 2690 3427 w
(it) 3170 3427 w
(should) 3273 3427 w
(be) 3638 3427 w
(possible) 3794 3427 w
(for) 4233 3427 w
(multiple) 4408 3427 w
(pro\255) 4842 3427 w
(grams to use a common security protocol without embedding it in each program.) 720 3547 w
(Some) 720 3703 w
(systems) 1038 3703 w
(use) 1483 3703 w
(dynamically) 1707 3703 w
(linked) 2332 3703 w
(libraries) 2684 3703 w
(\(DLLs\)) 3133 3703 w
(to) 3486 3703 w
(address) 3639 3703 w
(these) 4074 3703 w
(configuration) 4391 3703 w
(issues.) 720 3823 w
(The) 1141 3823 w
(problem) 1379 3823 w
(with) 1842 3823 w
(this) 2103 3823 w
(approach) 2338 3823 w
(is) 2845 3823 w
(that) 2981 3823 w
(it) 3228 3823 w
(leaves) 3350 3823 w
(security) 3705 3823 w
(code) 4140 3823 w
(in) 4427 3823 w
(the) 4574 3823 w
(same) 4785 3823 w
(address) 720 3943 w
(space) 1140 3943 w
(as) 1456 3943 w
(the) 1602 3943 w
(program) 1797 3943 w
(using) 2253 3943 w
(it.) 2559 3943 w
(The) 2729 3943 w
(interactions) 2951 3943 w
(between) 3563 3943 w
(the) 4011 3943 w
(program) 4207 3943 w
(and) 4664 3943 w
(the) 4885 3943 w
(DLL) 720 4063 w
(can) 944 4063 w
(therefore) 1155 4063 w
(accidentally) 1645 4063 w
(or) 2257 4063 w
(deliberately) 2402 4063 w
(violate) 3011 4063 w
(the) 3373 4063 w
(interface,) 3571 4063 w
(weakening) 4070 4063 w
(security.) 4629 4063 w
(Also,) 720 4183 w
(a) 1010 4183 w
(program) 1113 4183 w
(using) 1578 4183 w
(a) 1893 4183 w
(library) 1997 4183 w
(to) 2356 4183 w
(implement) 2503 4183 w
(secure) 3070 4183 w
(services) 3436 4183 w
(must) 3872 4183 w
(run) 4164 4183 w
(at) 4378 4183 w
(a) 4519 4183 w
(privilege) 4623 4183 w
(level) 720 4303 w
(necessary) 993 4303 w
(to) 1519 4303 w
(provide) 1668 4303 w
(the) 2084 4303 w
(service;) 2290 4303 w
(separating) 2708 4303 w
(the) 3269 4303 w
(security) 3474 4303 w
(to) 3903 4303 w
(a) 4051 4303 w
(different) 4156 4303 w
(program) 4624 4303 w
(makes) 720 4423 w
(it) 1070 4423 w
(possible) 1173 4423 w
(to) 1613 4423 w
(run) 1748 4423 w
(the) 1950 4423 w
(services) 2142 4423 w
(at) 2566 4423 w
(a) 2695 4423 w
(weaker) 2787 4423 w
(privilege) 3167 4423 w
(level,) 3622 4423 w
(isolating) 3914 4423 w
(the) 4367 4423 w
(privileged) 4560 4423 w
(code to a single, more trustworthy component.) 720 4543 w
(Following) 720 4699 w
(the) 1242 4699 w
(lead) 1455 4699 w
(of) 1717 4699 w
(the) 1874 4699 w
(SSH) 2088 4699 w
(agent) 2329 4699 w
([Ylon96],) 2660 4699 w
(we) 3157 4699 w
(give) 3349 4699 w
(each) 3607 4699 w
(user) 3890 4699 w
(an) 4159 4699 w
(agent) 4335 4699 w
(process) 4666 4699 w
(responsible) 720 4819 w
(for) 1353 4819 w
(holding) 1563 4819 w
(and) 2002 4819 w
(using) 2253 4819 w
(the) 2589 4819 w
(user) 2814 4819 w
10 /LucidaSansUnicode20 f
(\031) 3024 4819 w
10 /LucidaSansUnicode00 f
(s) 3056 4819 w
(keys.) 3177 4819 w
(The) 3528 4819 w
(agent) 3779 4819 w
(program) 4121 4819 w
(is) 4607 4819 w
(called) 4757 4819 w
10 /LucidaTypewriter f
(factotum) 720 4939 w
10 /LucidaSansUnicode00 f
(because) 1336 4939 w
(of) 1770 4939 w
(its) 1908 4939 w
(similarity) 2066 4939 w
(to) 2552 4939 w
(the) 2691 4939 w
(proverbial) 2887 4939 w
(servant) 3418 4939 w
(with) 3813 4939 w
(the) 4059 4939 w
(power) 4255 4939 w
(to) 4594 4939 w
(act) 4733 4939 w
(on) 4917 4939 w
(behalf) 720 5059 w
(of) 1070 5059 w
(his) 1216 5059 w
(master) 1406 5059 w
(because) 1787 5059 w
(he) 2229 5059 w
(holds) 2395 5059 w
(the) 2709 5059 w
(keys) 2912 5059 w
(to) 3177 5059 w
(all) 3323 5059 w
(the) 3484 5059 w
(master) 3686 5059 w
10 /LucidaSansUnicode20 f
(\031) 4019 5059 w
10 /LucidaSansUnicode00 f
(s) 4051 5059 w
(possessions.) 4149 5059 w
(It) 4847 5059 w
(is) 4960 5059 w
(essential) 720 5179 w
(that) 1184 5179 w
10 /LucidaTypewriter f
(factotum) 1414 5179 w
10 /LucidaSansUnicode00 f
(keep) 2029 5179 w
(the) 2301 5179 w
(keys) 2495 5179 w
(secret) 2751 5179 w
(and) 3082 5179 w
(use) 3301 5179 w
(them) 3509 5179 w
(only) 3796 5179 w
(in) 4039 5179 w
(the) 4169 5179 w
(owner) 4363 5179 w
10 /LucidaSansUnicode20 f
(\031) 4660 5179 w
10 /LucidaSansUnicode00 f
(s) 4692 5179 w
(inter\255) 4782 5179 w
(est.) 720 5299 w
(Later) 998 5299 w
(we) 1310 5299 w
10 /LucidaSansUnicode20 f
(\031) 1443 5299 w
10 /LucidaSansUnicode00 f
(ll) 1475 5299 w
(discuss) 1603 5299 w
(some) 2030 5299 w
(changes) 2360 5299 w
(to) 2828 5299 w
(the) 2995 5299 w
(kernel) 3219 5299 w
(to) 3590 5299 w
(reduce) 3757 5299 w
(the) 4155 5299 w
(possibility) 4379 5299 w
(of) 4942 5299 w
10 /LucidaTypewriter f
(factotum) 720 5419 w
10 /LucidaSansUnicode00 f
(leaking information inadvertently.) 1328 5419 w
10 /LucidaTypewriter f
(Factotum) 720 5575 w
10 /LucidaSansUnicode00 f
(is) 1332 5575 w
(implemented,) 1448 5575 w
(like) 2153 5575 w
(most) 2361 5575 w
(Plan) 2639 5575 w
(9) 2877 5575 w
(services,) 2977 5575 w
(as) 3433 5575 w
(a) 3576 5575 w
(file) 3668 5575 w
(server.) 3856 5575 w
(It) 4254 5575 w
(is) 4357 5575 w
(convention\255) 4474 5575 w
(ally) 720 5695 w
(mounted) 939 5695 w
(upon) 1426 5695 w
(the) 1727 5695 w
(directory) 1935 5695 w
10 /LucidaTypewriter f
(/mnt/factotum) 2419 5695 w
10 /LucidaSansUnicode00 f
(and) 3408 5695 w
(the) 3641 5695 w
(files) 3849 5695 w
(it) 4104 5695 w
(serves) 4223 5695 w
(there) 4583 5695 w
(are) 4888 5695 w
(analogous) 720 5815 w
(to) 1261 5815 w
(virtual) 1402 5815 w
(devices) 1750 5815 w
(that) 2152 5815 w
(provide) 2387 5815 w
(access) 2796 5815 w
(to,) 3155 5815 w
(and) 3329 5815 w
(control) 3553 5815 w
(of,) 3939 5815 w
(the) 4113 5815 w
(services) 4312 5815 w
(of) 4743 5815 w
(the) 4885 5815 w
10 /LucidaTypewriter f
(factotum) 720 5935 w
10 /LucidaSansUnicode00 f
(.) 1296 5935 w
(The) 1395 5935 w
(next) 1611 5935 w
(few) 1862 5935 w
(sections) 2067 5935 w
(describe) 2500 5935 w
(the) 2945 5935 w
(design) 3135 5935 w
(of) 3493 5935 w
10 /LucidaTypewriter f
(factotum) 3626 5935 w
10 /LucidaSansUnicode00 f
(and) 4237 5935 w
(how) 4452 5935 w
(it) 4686 5935 w
(oper\255) 4786 5935 w
(ates with the other pieces of Plan 9 to provide security services.) 720 6055 w
(Logging in) 3881 6055 w
(To) 720 6211 w
(make) 878 6211 w
(the) 1174 6211 w
(discussions) 1363 6211 w
(that) 1958 6211 w
(follow) 2184 6211 w
(more) 2513 6211 w
(concrete,) 2799 6211 w
(we) 3281 6211 w
(begin) 3449 6211 w
(with) 3756 6211 w
(a) 3996 6211 w
(couple) 4086 6211 w
(of) 4443 6211 w
(examples) 4576 6211 w
(showing) 720 6331 w
(how) 1159 6331 w
(the) 1394 6331 w
(Plan) 1584 6331 w
(9) 1820 6331 w
(security) 1918 6331 w
(architecture) 2332 6331 w
(appears) 2945 6331 w
(to) 3364 6331 w
(the) 3497 6331 w
(user.) 3687 6331 w
(These) 3996 6331 w
(examples) 4319 6331 w
(both) 4817 6331 w
(involve) 720 6451 w
(a) 1100 6451 w
(user) 1194 6451 w
10 /LucidaTypewriter f
(gre) 1443 6451 w
10 /LucidaSansUnicode00 f
(logging) 1698 6451 w
(in) 2104 6451 w
(after) 2234 6451 w
(booting) 2500 6451 w
(a) 2915 6451 w
(local) 3010 6451 w
(machine.) 3275 6451 w
(The) 3787 6451 w
(user) 4008 6451 w
(may) 4258 6451 w
(or) 4498 6451 w
(may) 4640 6451 w
(not) 4880 6451 w
(have) 720 6571 w
(a) 987 6571 w
(secure) 1084 6571 w
(store) 1442 6571 w
(in) 1729 6571 w
(which) 1861 6571 w
(all) 2183 6571 w
(his) 2337 6571 w
(keys) 2520 6571 w
(are) 2778 6571 w
(kept.) 2971 6571 w
(If) 3290 6571 w
(he) 3397 6571 w
(does,) 3556 6571 w
10 /LucidaTypewriter f
(factotum) 3860 6571 w
10 /LucidaSansUnicode00 f
(will) 4477 6571 w
(prompt) 4682 6571 w
(him) 720 6691 w
(for) 941 6691 w
(the) 1117 6691 w
(password) 1309 6691 w
(to) 1808 6691 w
(the) 1943 6691 w
(secure) 2135 6691 w
(store) 2489 6691 w
(and) 2772 6691 w
(obtain) 2989 6691 w
(keys) 3333 6691 w
(from) 3587 6691 w
(it,) 3856 6691 w
(prompting) 3992 6691 w
(only) 4541 6691 w
(when) 4783 6691 w
(a key isn) 720 6811 w
10 /LucidaSansUnicode20 f
(\031) 1147 6811 w
10 /LucidaSansUnicode00 f
(t found in the store.) 1179 6811 w
(If not,) 2217 6811 w
10 /LucidaTypewriter f
(factotum) 2539 6811 w
10 /LucidaSansUnicode00 f
(must prompt for each key.) 3147 6811 w
(In) 720 6967 w
(the) 864 6967 w
(typescripts,) 1072 6967 w
10 /LucidaTypewriter f
(\\n) 1688 6967 w
10 /LucidaSansUnicode00 f
(represents) 1885 6967 w
(a) 2452 6967 w
(literal) 2560 6967 w
(newline) 2889 6967 w
(character) 3313 6967 w
(typed) 3815 6967 w
(to) 4140 6967 w
(force) 4292 6967 w
(a) 4592 6967 w
(default) 4701 6967 w
(response.) 720 7087 w
(User input is in italics, and long lines are folded and indented to fit.) 1257 7087 w
(This) 720 7243 w
(first) 971 7243 w
(example) 1212 7243 w
(shows) 1671 7243 w
(a) 2019 7243 w
(user) 2120 7243 w
(logging) 2376 7243 w
(in) 2789 7243 w
(without) 2926 7243 w
(help) 3337 7243 w
(from) 3594 7243 w
(the) 3873 7243 w
(secure) 4075 7243 w
(store.) 4439 7243 w
(First,) 4796 7243 w
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10 /LucidaSansUnicode00 f
(\255 4 \255) 2783 480 w
10 /LucidaTypewriter f
(factotum) 720 840 w
10 /LucidaSansUnicode00 f
(prompts for a user name that the local kernel will use:) 1328 840 w
9 /LucidaTypewriter f
(user[none]:) 1008 1010 w
9 /Helvetica f
(gre) 1788 1010 w
10 /LucidaSansUnicode00 f
(\(Default) 720 1190 w
(responses) 1151 1190 w
(appear) 1690 1190 w
(in) 2070 1190 w
(square) 2208 1190 w
(brackets.\)) 2583 1190 w
(The) 3139 1190 w
(kernel) 3367 1190 w
(then) 3716 1190 w
(starts) 3980 1190 w
(accessing) 4299 1190 w
(local) 4815 1190 w
(resources and requests, through) 720 1310 w
10 /LucidaTypewriter f
(factotum) 2334 1310 w
10 /LucidaSansUnicode00 f
(, a user/password pair to do so:) 2910 1310 w
9 /LucidaTypewriter f
(!Adding) 1008 1480 w
(key:) 1528 1480 w
(dom=cs.bell-labs.com) 1853 1480 w
(proto=p9sk1) 1268 1590 w
(user[gre]:) 1008 1700 w
9 /Helvetica f
(\\n) 1723 1700 w
9 /LucidaTypewriter f
(password:) 1008 1810 w
9 /Helvetica f
(****) 1658 1810 w
10 /LucidaSansUnicode00 f
(Now the user is logged in to the local system, and the mail client starts up:) 720 1990 w
9 /LucidaTypewriter f
(!Adding) 1008 2160 w
(key:) 1528 2160 w
(proto=apop) 1853 2160 w
(server=plan9.bell-labs.com) 1268 2270 w
(user[gre]:) 1008 2380 w
9 /Helvetica f
(\\n) 1723 2380 w
9 /LucidaTypewriter f
(password:) 1008 2490 w
9 /Helvetica f
(****) 1658 2490 w
10 /LucidaTypewriter f
(Factotum) 720 2670 w
10 /LucidaSansUnicode00 f
(is) 1337 2670 w
(doing) 1458 2670 w
(all) 1776 2670 w
(the) 1930 2670 w
(prompting) 2126 2670 w
(and) 2678 2670 w
(the) 2899 2670 w
(applications) 3095 2670 w
(being) 3722 2670 w
(started) 4036 2670 w
(are) 4418 2670 w
(not) 4612 2670 w
(even) 4814 2670 w
(touching the keys.) 720 2790 w
(Note that it) 1678 2790 w
10 /LucidaSansUnicode20 f
(\031) 2227 2790 w
10 /LucidaSansUnicode00 f
(s always clear what key is being requested.) 2259 2790 w
(Now) 720 2946 w
(consider) 974 2946 w
(the) 1430 2946 w
(same) 1627 2946 w
(login) 1924 2946 w
(sequence,) 2209 2946 w
(but) 2740 2946 w
(in) 2944 2946 w
(the) 3077 2946 w
(case) 3275 2946 w
(where) 3531 2946 w
10 /LucidaTypewriter f
(gre) 3866 2946 w
10 /LucidaSansUnicode00 f
(has) 4125 2946 w
(a) 4336 2946 w
(secure) 4434 2946 w
(store) 4794 2946 w
(account:) 720 3066 w
9 /LucidaTypewriter f
(user[none]:) 1008 3236 w
9 /Helvetica f
(gre) 1788 3236 w
9 /LucidaTypewriter f
(secstore) 1008 3346 w
(password:) 1593 3346 w
9 /Helvetica f
(******) 2243 3346 w
9 /LucidaTypewriter f
(STA) 1008 3456 w
(PIN+SecurID:) 1268 3456 w
9 /Helvetica f
(******) 2113 3456 w
10 /LucidaSansUnicode00 f
(That) 720 3636 w
10 /LucidaSansUnicode20 f
(\031) 937 3636 w
10 /LucidaSansUnicode00 f
(s) 969 3636 w
(the) 1062 3636 w
(last) 1259 3636 w
10 /LucidaTypewriter f
(gre) 1473 3636 w
10 /LucidaSansUnicode00 f
(will) 1731 3636 w
(hear) 1937 3636 w
(from) 2193 3636 w
10 /LucidaTypewriter f
(factotum) 2467 3636 w
10 /LucidaSansUnicode00 f
(unless) 3085 3636 w
(an) 3438 3636 w
(attempt) 3597 3636 w
(is) 4017 3636 w
(made) 4139 3636 w
(to) 4448 3636 w
(contact) 4588 3636 w
(a) 4985 3636 w
(system for which no key is kept in the secure store.) 720 3756 w
(The factotum) 3288 3756 w
(Each) 720 3912 w
(computer) 983 3912 w
(running) 1488 3912 w
(Plan) 1909 3912 w
(9) 2151 3912 w
(has) 2255 3912 w
(one) 2464 3912 w
(user) 2684 3912 w
(id) 2935 3912 w
(that) 3068 3912 w
(owns) 3300 3912 w
(all) 3592 3912 w
(the) 3746 3912 w
(resources) 3943 3912 w
(on) 4455 3912 w
(that) 4620 3912 w
(sys\255) 4853 3912 w
(tem) 720 4032 w
10 /LucidaSansUnicode20 f
(\024) 944 4032 w
10 /LucidaSansUnicode00 f
(the) 1082 4032 w
(scheduler,) 1275 4032 w
(local) 1816 4032 w
(disks,) 2079 4032 w
(network) 2401 4032 w
(interfaces,) 2831 4032 w
(etc.) 3376 4032 w
(That) 3622 4032 w
(user,) 3877 4032 w
(the) 4157 4032 w
10 /LucidaSans-Italic f
(host) 4350 4032 w
(owner) 4593 4032 w
10 /LucidaSansUnicode00 f
(,) 4891 4032 w
(is) 4960 4032 w
(the) 720 4152 w
(closest) 911 4152 w
(analogue) 1283 4152 w
(in) 1761 4152 w
(Plan) 1888 4152 w
(9) 2125 4152 w
(to) 2224 4152 w
(a) 2358 4152 w
(Unix) 2449 4152 w
10 /LucidaTypewriter f
(root) 2706 4152 w
10 /LucidaSansUnicode00 f
(account) 3030 4152 w
(\(although) 3446 4152 w
(it) 3946 4152 w
(is) 4049 4152 w
(far) 4166 4152 w
(weaker;) 4336 4152 w
(rather) 4748 4152 w
(than) 720 4272 w
(having) 983 4272 w
(special) 1352 4272 w
(powers,) 1733 4272 w
(as) 2161 4272 w
(its) 2313 4272 w
(name) 2476 4272 w
(implies) 2788 4272 w
(the) 3184 4272 w
(host) 3385 4272 w
(owner) 3642 4272 w
(is) 3985 4272 w
(just) 4111 4272 w
(a) 4337 4272 w
(regular) 4438 4272 w
(user) 4830 4272 w
(that) 720 4392 w
(happens) 963 4392 w
(to) 1427 4392 w
(own) 1578 4392 w
(the) 1831 4392 w
(resources) 2039 4392 w
(of) 2562 4392 w
(the) 2713 4392 w
(local) 2921 4392 w
(machine\).) 3199 4392 w
(On) 3757 4392 w
(a) 3950 4392 w
(single-user) 4058 4392 w
(system,) 4668 4392 w
(which) 720 4512 w
(we) 1037 4512 w
(call) 1206 4512 w
(a) 1406 4512 w
(terminal,) 1497 4512 w
(the) 1967 4512 w
(host) 2158 4512 w
(owner) 2405 4512 w
(is) 2738 4512 w
(the) 2854 4512 w
(id) 3045 4512 w
(of) 3173 4512 w
(the) 3307 4512 w
(terminal) 3497 4512 w
10 /LucidaSansUnicode20 f
(\031) 3899 4512 w
10 /LucidaSansUnicode00 f
(s) 3931 4512 w
(user.) 4017 4512 w
(Shared) 4326 4512 w
(servers) 4692 4512 w
(such) 720 4632 w
(as) 989 4632 w
(CPU) 1139 4632 w
(servers) 1376 4632 w
(normally) 1768 4632 w
(have) 2234 4632 w
(a) 2503 4632 w
(pseudo-user) 2602 4632 w
(that) 3270 4632 w
(initially) 3505 4632 w
(owns) 3900 4632 w
(all) 4195 4632 w
(resources.) 4352 4632 w
(By) 4930 4632 w
(default,) 720 4752 w
10 /LucidaTypewriter f
(factotum) 1123 4752 w
10 /LucidaSansUnicode00 f
(executes as, and therefore has the privileges of, the host owner.) 1731 4752 w
(New) 720 4908 w
(processes) 969 4908 w
(run) 1492 4908 w
(as) 1699 4908 w
(the) 1847 4908 w
(same) 2044 4908 w
(user) 2341 4908 w
(as) 2593 4908 w
(the) 2741 4908 w
(process) 2938 4908 w
(which) 3354 4908 w
(created) 3678 4908 w
(them.) 4080 4908 w
(When) 4435 4908 w
(a) 4744 4908 w
(pro\255) 4842 4908 w
(cess) 720 5028 w
(must) 981 5028 w
(take) 1276 5028 w
(on) 1534 5028 w
(the) 1709 5028 w
(identity) 1916 5028 w
(of) 2333 5028 w
(a) 2483 5028 w
(new) 2590 5028 w
(user,) 2837 5028 w
(such) 3131 5028 w
(as) 3409 5028 w
(to) 3567 5028 w
(provide) 3717 5028 w
(a) 4133 5028 w
(login) 4239 5028 w
(shell) 4533 5028 w
(on) 4811 5028 w
(a) 4985 5028 w
(shared) 720 5148 w
(CPU) 1102 5148 w
(server,) 1349 5148 w
(it) 1732 5148 w
(does) 1852 5148 w
(so) 2137 5148 w
(by) 2303 5148 w
(proving) 2473 5148 w
(to) 2898 5148 w
(the) 3051 5148 w
(host) 3261 5148 w
(owner) 3527 5148 w
10 /LucidaSansUnicode20 f
(\031) 3824 5148 w
10 /LucidaSansUnicode00 f
(s) 3856 5148 w
10 /LucidaTypewriter f
(factotum) 3962 5148 w
10 /LucidaSansUnicode00 f
(that) 4593 5148 w
(it) 4839 5148 w
(is) 4960 5148 w
(authorized) 720 5268 w
(to) 1323 5268 w
(do) 1501 5268 w
(so.) 1705 5268 w
(This) 1961 5268 w
(is) 2246 5268 w
(done) 2406 5268 w
(by) 2728 5268 w
(running) 2923 5268 w
(an) 3382 5268 w
(authentication) 3578 5268 w
(protocol) 4352 5268 w
(with) 4835 5268 w
10 /LucidaTypewriter f
(factotum) 720 5388 w
10 /LucidaSansUnicode00 f
(to) 1340 5388 w
(prove) 1482 5388 w
(that) 1799 5388 w
(the) 2034 5388 w
(process) 2233 5388 w
(has) 2651 5388 w
(access) 2863 5388 w
(to) 3222 5388 w
(secret) 3364 5388 w
(information) 3700 5388 w
(which) 4311 5388 w
(only) 4636 5388 w
(the) 4885 5388 w
(new) 720 5508 w
(user) 948 5508 w
(should possess.) 1191 5508 w
(For example, consider the setup in Figure 1a.) 2031 5508 w
(If a user on the) 4303 5508 w
(terminal) 720 5628 w
(wants) 1162 5628 w
(to) 1484 5628 w
(log) 1622 5628 w
(on) 1814 5628 w
(to) 1977 5628 w
(the) 2115 5628 w
(CPU) 2310 5628 w
(server) 2543 5628 w
(using) 2880 5628 w
(the) 3186 5628 w
(Plan) 3381 5628 w
(9) 3622 5628 w
10 /LucidaTypewriter f
(cpu) 3726 5628 w
10 /LucidaSansUnicode00 f
(service) 3983 5628 w
([Pike93],) 4360 5628 w
(then) 4823 5628 w
11 /LucidaSans-Italic f
(P) 720 5748 w
8 /LucidaSans-Italic f
(T) 797 5770 w
10 /LucidaSansUnicode00 f
(might) 892 5748 w
(be) 1211 5748 w
(the) 1366 5748 w
10 /LucidaTypewriter f
(cpu) 1557 5748 w
10 /LucidaSansUnicode00 f
(client) 1809 5748 w
(program) 2109 5748 w
(and) 2561 5748 w
11 /LucidaSans-Italic f
(P) 2780 5748 w
8 /LucidaSans-Italic f
(C) 2857 5770 w
10 /LucidaSansUnicode00 f
(the) 2956 5748 w
10 /LucidaTypewriter f
(cpu) 3147 5748 w
10 /LucidaSansUnicode00 f
(server.) 3399 5748 w
(Neither) 3796 5748 w
11 /LucidaSans-Italic f
(P) 4186 5748 w
8 /LucidaSans-Italic f
(C) 4263 5770 w
10 /LucidaSansUnicode00 f
(nor) 4361 5748 w
11 /LucidaSans-Italic f
(P) 4560 5748 w
8 /LucidaSans-Italic f
(T) 4637 5770 w
10 /LucidaSansUnicode00 f
(knows) 4731 5748 w
(the) 720 5868 w
(details) 908 5868 w
(of) 1261 5868 w
(the) 1392 5868 w
(authentication.) 1580 5868 w
(They) 2372 5868 w
(do) 2639 5868 w
(need) 2797 5868 w
(to) 3068 5868 w
(be) 3200 5868 w
(able) 3353 5868 w
(to) 3590 5868 w
(shuttle) 3722 5868 w
(messages) 4090 5868 w
(back) 4599 5868 w
(and) 4860 5868 w
(forth) 720 5988 w
(between) 1012 5988 w
(the) 1473 5988 w
(two) 1682 5988 w
10 /LucidaTypewriter f
(factotums) 1911 5988 w
10 /LucidaSansUnicode00 f
(,) 2559 5988 w
(but) 2645 5988 w
(this) 2861 5988 w
(is) 3094 5988 w
(a) 3228 5988 w
(generic) 3337 5988 w
(function) 3748 5988 w
(easily) 4203 5988 w
(performed) 4529 5988 w
(without) 720 6108 w
(knowing,) 1120 6108 w
(or) 1598 6108 w
(being) 1735 6108 w
(able) 2042 6108 w
(to) 2280 6108 w
(extract,) 2413 6108 w
(secrets) 2818 6108 w
(in) 3196 6108 w
(the) 3322 6108 w
(messages.) 3512 6108 w
11 /LucidaSans-Italic f
(P) 4092 6108 w
8 /LucidaSans-Italic f
(T) 4169 6130 w
10 /LucidaSansUnicode00 f
(will) 4263 6108 w
(make) 4463 6108 w
(a) 4761 6108 w
(net\255) 4852 6108 w
(work) 720 6228 w
(connection) 1000 6228 w
(to) 1575 6228 w
11 /LucidaSans-Italic f
(P) 1716 6228 w
8 /LucidaSans-Italic f
(C) 1793 6250 w
10 /LucidaSansUnicode00 f
(.) 1856 6228 w
11 /LucidaSans-Italic f
(P) 1969 6228 w
8 /LucidaSans-Italic f
(T) 2046 6250 w
10 /LucidaSansUnicode00 f
(and) 2148 6228 w
11 /LucidaSans-Italic f
(P) 2374 6228 w
8 /LucidaSans-Italic f
(C) 2451 6250 w
10 /LucidaSansUnicode00 f
(will) 2557 6228 w
(then) 2764 6228 w
(relay) 3024 6228 w
(messages) 3300 6228 w
(between) 3818 6228 w
(the) 4267 6228 w
10 /LucidaTypewriter f
(factotum) 4464 6228 w
10 /LucidaSansUnicode00 f
(owned) 720 6348 w
(by) 1073 6348 w
(the) 1222 6348 w
(user,) 1411 6348 w
11 /LucidaSans-Italic f
(F) 1687 6348 w
8 /LucidaSans-Italic f
(T) 1759 6370 w
10 /LucidaSansUnicode00 f
(,) 1818 6348 w
(and) 1884 6348 w
(the) 2098 6348 w
(one) 2287 6348 w
(owned) 2500 6348 w
(by) 2853 6348 w
(the) 3002 6348 w
(CPU) 3191 6348 w
(server,) 3418 6348 w
11 /LucidaSans-Italic f
(F) 3781 6348 w
8 /LucidaSans-Italic f
(C) 3853 6370 w
10 /LucidaSansUnicode00 f
(,) 3916 6348 w
(until) 3982 6348 w
(mutual) 4235 6348 w
(authenti\255) 4607 6348 w
(cation) 720 6468 w
(has) 1056 6468 w
(been) 1265 6468 w
(established.) 1543 6468 w
(Later) 2200 6468 w
(sections) 2483 6468 w
(describe) 2922 6468 w
(the) 3373 6468 w
(RPC) 3569 6468 w
(between) 3797 6468 w
10 /LucidaTypewriter f
(factotum) 4244 6468 w
10 /LucidaSansUnicode00 f
(and) 4860 6468 w
(applications and the library functions to support proxy operations.) 720 6588 w
(The) 720 6744 w
(kernel) 960 6744 w
(always) 1321 6744 w
(uses) 1699 6744 w
(a) 1978 6744 w
(single) 2092 6744 w
(local) 2440 6744 w
(instance) 2724 6744 w
(of) 3186 6744 w
10 /LucidaTypewriter f
(factotum) 3343 6744 w
10 /LucidaSansUnicode00 f
(,) 3919 6744 w
(running) 4010 6744 w
(as) 4449 6744 w
(the) 4614 6744 w
(host) 4829 6744 w
(owner,) 720 6864 w
(for) 1082 6864 w
(its) 1254 6864 w
(authentication) 1404 6864 w
(purposes,) 2132 6864 w
(but) 2645 6864 w
(a) 2840 6864 w
(regular) 2928 6864 w
(user may start multiple) 3307 6864 w
10 /LucidaTypewriter f
(factotum) 4464 6864 w
10 /LucidaSansUnicode00 f
(agents.) 720 6984 w
(In) 1141 6984 w
(fact,) 1267 6984 w
(the) 1514 6984 w
10 /LucidaTypewriter f
(factotum) 1704 6984 w
10 /LucidaSansUnicode00 f
(representing) 2315 6984 w
(the) 2966 6984 w
(user) 3156 6984 w
(need) 3401 6984 w
(not) 3673 6984 w
(be) 3868 6984 w
(running) 4022 6984 w
(on) 4437 6984 w
(the) 4595 6984 w
(same) 4785 6984 w
(machine) 720 7104 w
(as) 1169 7104 w
(its) 1315 7104 w
(client.) 1472 7104 w
(For) 1840 7104 w
(instance,) 2036 7104 w
(it) 2511 7104 w
(is) 2617 7104 w
(easy) 2737 7104 w
(for) 2991 7104 w
(a) 3170 7104 w
(user) 3265 7104 w
(on) 3515 7104 w
(a) 3678 7104 w
(CPU) 3773 7104 w
(server,) 4006 7104 w
(through) 4375 7104 w
(stan\255) 4802 7104 w
(dard) 720 7224 w
(Plan) 977 7224 w
(9) 1213 7224 w
(operations,) 1311 7224 w
(to) 1894 7224 w
(replace) 2027 7224 w
(the) 2413 7224 w
10 /LucidaTypewriter f
(/mnt/factotum) 2603 7224 w
10 /LucidaSansUnicode00 f
(in) 3574 7224 w
(the) 3700 7224 w
(user) 3890 7224 w
10 /LucidaSansUnicode20 f
(\031) 4100 7224 w
10 /LucidaSansUnicode00 f
(s) 4132 7224 w
(private) 4218 7224 w
(file) 4587 7224 w
(name) 4774 7224 w
cleartomark
showpage
saveobj restore
%%EndPage: 4 4
%%Page: 5 5
/saveobj save def
mark
5 pagesetup
10 /LucidaSansUnicode00 f
(\255 5 \255) 2783 480 w
(space) 720 840 w
(on) 1033 840 w
(the) 1193 840 w
(server) 1385 840 w
(with) 1719 840 w
(a) 1961 840 w
(connection) 2053 840 w
(to) 2621 840 w
(the) 2755 840 w
10 /LucidaTypewriter f
(factotum) 2946 840 w
10 /LucidaSansUnicode00 f
(running) 3558 840 w
(on) 3974 840 w
(the) 4133 840 w
(terminal.) 4324 840 w
(\(The) 4826 840 w
(usual) 720 960 w
(file) 1018 960 w
(system) 1208 960 w
(permissions) 1587 960 w
(prevent) 2213 960 w
(interlopers) 2619 960 w
(from) 3184 960 w
(doing) 3455 960 w
(so) 3772 960 w
(maliciously.\)) 3924 960 w
(This) 4602 960 w
(per\255) 4847 960 w
(mits) 720 1080 w
(secure operations on the CPU server to be transparently validated by the user) 963 1080 w
10 /LucidaSansUnicode20 f
(\031) 4725 1080 w
10 /LucidaSansUnicode00 f
(s own) 4757 1080 w
10 /LucidaTypewriter f
(factotum) 720 1200 w
10 /LucidaSansUnicode00 f
(,) 1296 1200 w
(so) 1369 1200 w
(secrets) 1522 1200 w
(need) 1906 1200 w
(never) 2184 1200 w
(leave) 2493 1200 w
(the) 2783 1200 w
(user) 2980 1200 w
10 /LucidaSansUnicode20 f
(\031) 3190 1200 w
10 /LucidaSansUnicode00 f
(s) 3222 1200 w
(terminal.) 3315 1200 w
(SSH) 3823 1200 w
(agent) 4047 1200 w
([Ylon96]) 4361 1200 w
(does) 4809 1200 w
(much) 720 1320 w
(the) 1036 1320 w
(same) 1239 1320 w
(with) 1541 1320 w
(special) 1793 1320 w
(SSH) 2174 1320 w
(protocol) 2403 1320 w
(messages,) 2854 1320 w
(but) 3408 1320 w
(an) 3617 1320 w
(advantage) 3781 1320 w
(to) 4325 1320 w
(making) 4470 1320 w
(our) 4876 1320 w
(agent) 720 1440 w
(a) 1043 1440 w
(file) 1149 1440 w
(system) 1351 1440 w
(is) 1742 1440 w
(that) 1873 1440 w
(we) 2115 1440 w
(need) 2299 1440 w
(no) 2587 1440 w
(new) 2761 1440 w
(mechanism) 3007 1440 w
(to) 3610 1440 w
(access) 3759 1440 w
(our) 4125 1440 w
(remote) 4340 1440 w
(agent;) 4736 1440 w
(remote file access is sufficient.) 720 1560 w
(Within) 720 1716 w
10 /LucidaTypewriter f
(factotum) 1078 1716 w
10 /LucidaSansUnicode00 f
(,) 1654 1716 w
(each) 1739 1716 w
(protocol) 2016 1716 w
(is) 2473 1716 w
(implemented) 2606 1716 w
(as) 3296 1716 w
(a) 3455 1716 w
(state) 3563 1716 w
(machine) 3853 1716 w
(with) 4315 1716 w
(a) 4574 1716 w
(generic) 4683 1716 w
(interface,) 720 1836 w
(so) 1214 1836 w
(protocols) 1364 1836 w
(are) 1857 1836 w
(in) 2047 1836 w
(essence) 2176 1836 w
(pluggable) 2597 1836 w
(modules,) 3116 1836 w
(easy) 3601 1836 w
(to) 3852 1836 w
(add,) 3987 1836 w
(modify,) 4237 1836 w
(or) 4641 1836 w
(drop.) 4780 1836 w
(Writing) 720 1956 w
(a) 1106 1956 w
(message) 1201 1956 w
(to) 1665 1956 w
(and) 1803 1956 w
(reading) 2023 1956 w
(a) 2431 1956 w
(message) 2526 1956 w
(from) 2990 1956 w
10 /LucidaTypewriter f
(factotum) 3262 1956 w
10 /LucidaSansUnicode00 f
(each) 3878 1956 w
(require) 4142 1956 w
(a) 4530 1956 w
(separate) 4626 1956 w
(RPC) 720 2076 w
(and) 950 2076 w
(result) 1173 2076 w
(in) 1492 2076 w
(a) 1626 2076 w
(single) 1724 2076 w
(state) 2056 2076 w
(transition.) 2335 2076 w
(Therefore) 2906 2076 w
10 /LucidaTypewriter f
(factotum) 3422 2076 w
10 /LucidaSansUnicode00 f
(always) 4041 2076 w
(runs) 4403 2076 w
(to) 4662 2076 w
(com\255) 4802 2076 w
(pletion) 720 2196 w
(on) 1115 2196 w
(every) 1296 2196 w
(RPC) 1611 2196 w
(and) 1856 2196 w
(never) 2094 2196 w
(blocks) 2419 2196 w
(waiting) 2790 2196 w
(for) 3199 2196 w
(input) 3396 2196 w
(during) 3707 2196 w
(any) 4085 2196 w
(authentication.) 4313 2196 w
(Moreover,) 720 2316 w
(the) 1244 2316 w
(number) 1437 2316 w
(of) 1852 2316 w
(simultaneous) 1988 2316 w
(authentications) 2674 2316 w
(is) 3458 2316 w
(limited) 3576 2316 w
(only) 3950 2316 w
(by) 4191 2316 w
(the) 4343 2316 w
(amount) 4535 2316 w
(of) 4942 2316 w
(memory we) 720 2436 w
10 /LucidaSansUnicode20 f
(\031) 1281 2436 w
10 /LucidaSansUnicode00 f
(re willing to dedicate to representing the state machines.) 1313 2436 w
(Authentication) 720 2592 w
(protocols) 1493 2592 w
(are) 2012 2592 w
(implemented) 2229 2592 w
(only) 2931 2592 w
(within) 3200 2592 w
10 /LucidaTypewriter f
(factotum) 3561 2592 w
10 /LucidaSansUnicode00 f
(,) 4137 2592 w
(but) 4234 2592 w
(adding) 4461 2592 w
(and) 4860 2592 w
(removing) 720 2712 w
(protocols) 1215 2712 w
(does) 1709 2712 w
(require) 1979 2712 w
(relinking) 2366 2712 w
(the) 2833 2712 w
(binary,) 3027 2712 w
(so) 3400 2712 w
10 /LucidaTypewriter f
(factotum) 3551 2712 w
10 /LucidaSansUnicode00 f
(processes) 4165 2712 w
(\(but) 4684 2712 w
(no) 4917 2712 w
(others\) need to be restarted in order to take advantage of new or repaired protocols.) 720 2832 w
(At) 720 2988 w
(the) 886 2988 w
(time) 1101 2988 w
(of) 1376 2988 w
(writing,) 1534 2988 w
10 /LucidaTypewriter f
(factotum) 1963 2988 w
10 /LucidaSansUnicode00 f
(contains) 2599 2988 w
(authentication) 3067 2988 w
(modules) 3823 2988 w
(for) 4299 2988 w
(the) 4499 2988 w
(Plan) 4715 2988 w
(9) 4977 2988 w
(shared) 720 3108 w
(key) 1082 3108 w
(protocol) 1281 3108 w
(\(p9sk1\),) 1718 3108 w
(for) 2147 3108 w
(SSH) 2319 3108 w
10 /LucidaSansUnicode20 f
(\031) 2501 3108 w
10 /LucidaSansUnicode00 f
(s) 2533 3108 w
(RSA) 2617 3108 w
(authentication,) 2836 3108 w
(passwords) 3596 3108 w
(in) 4142 3108 w
(the) 4266 3108 w
(clear,) 4454 3108 w
(APOP,) 4751 3108 w
(CRAM,) 720 3228 w
(PPP) 1085 3228 w
10 /LucidaSansUnicode20 f
(\031) 1250 3228 w
10 /LucidaSansUnicode00 f
(s) 1282 3228 w
(CHAP,) 1379 3228 w
(Microsoft) 1724 3228 w
(PPP) 2224 3228 w
10 /LucidaSansUnicode20 f
(\031) 2389 3228 w
10 /LucidaSansUnicode00 f
(s) 2421 3228 w
(MSCHAP,) 2518 3228 w
(and) 3003 3228 w
(VNC) 3229 3228 w
10 /LucidaSansUnicode20 f
(\031) 3437 3228 w
10 /LucidaSansUnicode00 f
(s) 3469 3228 w
(challenge/response.) 3566 3228 w
(We) 4632 3228 w
10 /LucidaSansUnicode20 f
(\031) 4774 3228 w
10 /LucidaSansUnicode00 f
(re) 4806 3228 w
(in) 4949 3228 w
(the process of adding support for TLS handshakes.) 720 3348 w
(Local capabilities) 3263 3348 w
(A) 720 3504 w
(capability) 833 3504 w
(system,) 1340 3504 w
(managed) 1756 3504 w
(by) 2246 3504 w
(the) 2405 3504 w
(kernel,) 2604 3504 w
(is) 2982 3504 w
(used) 3107 3504 w
(to) 3384 3504 w
(empower) 3527 3504 w
10 /LucidaTypewriter f
(factotum) 4019 3504 w
10 /LucidaSansUnicode00 f
(to) 4640 3504 w
(grant) 4783 3504 w
(permission) 720 3624 w
(to) 1293 3624 w
(another) 1428 3624 w
(process) 1839 3624 w
(to) 2250 3624 w
(change) 2385 3624 w
(its) 2770 3624 w
(user) 2924 3624 w
(id.) 3171 3624 w
(A) 3364 3624 w
(kernel) 3470 3624 w
(device) 3809 3624 w
(driver) 4153 3624 w
(implements) 4471 3624 w
(two) 720 3744 w
(files,) 934 3744 w
10 /LucidaTypewriter f
(/dev/caphash) 1207 3744 w
10 /LucidaSansUnicode00 f
(and) 2110 3744 w
10 /LucidaTypewriter f
(/dev/capuse) 2329 3744 w
10 /LucidaSansUnicode00 f
(.) 3121 3744 w
(The) 3224 3744 w
(write-only) 3444 3744 w
(file) 3985 3744 w
10 /LucidaTypewriter f
(/dev/caphash) 4176 3744 w
10 /LucidaSansUnicode00 f
(can) 720 3864 w
(be) 944 3864 w
(opened) 1119 3864 w
(only) 1536 3864 w
(by) 1796 3864 w
(the) 1967 3864 w
(host) 2178 3864 w
(owner,) 2445 3864 w
(and) 2830 3864 w
(only) 3066 3864 w
(once.) 3326 3864 w
10 /LucidaTypewriter f
(Factotum) 3676 3864 w
10 /LucidaSansUnicode00 f
(opens) 4307 3864 w
(this) 4655 3864 w
(file) 4889 3864 w
(immediately after booting.) 720 3984 w
(To) 720 4140 w
(use) 896 4140 w
(the) 1117 4140 w
(files,) 1324 4140 w
10 /LucidaTypewriter f
(factotum) 1610 4140 w
10 /LucidaSansUnicode00 f
(creates) 2238 4140 w
(a) 2637 4140 w
(string) 2744 4140 w
(of) 3078 4140 w
(the) 3228 4140 w
(form) 3436 4140 w
10 /LucidaSans-Italic f
(userid1) 3721 4140 w
10 /LucidaTypewriter f
(@) 4086 4140 w
10 /LucidaSans-Italic f
(userid2) 4158 4140 w
10 /LucidaTypewriter f
(@) 4523 4140 w
10 /LucidaSans-Italic f
(random-) 4595 4140 w
(string) 720 4260 w
10 /LucidaSansUnicode00 f
(,) 1007 4260 w
(uses) 1084 4260 w
(SHA1) 1349 4260 w
(HMAC) 1654 4260 w
(to) 1996 4260 w
(hash) 2138 4260 w
10 /LucidaSans-Italic f
(userid1) 2412 4260 w
10 /LucidaTypewriter f
(@) 2777 4260 w
10 /LucidaSans-Italic f
(userid2) 2849 4260 w
10 /LucidaSansUnicode00 f
(with) 3258 4260 w
(key) 3507 4260 w
10 /LucidaSans-Italic f
(random-string) 3717 4260 w
10 /LucidaSansUnicode00 f
(,) 4449 4260 w
(and) 4525 4260 w
(writes) 4749 4260 w
(that) 720 4380 w
(hash) 954 4380 w
(to) 1227 4380 w
10 /LucidaTypewriter f
(/dev/caphash) 1368 4380 w
10 /LucidaSansUnicode00 f
(.) 2232 4380 w
10 /LucidaTypewriter f
(Factotum) 2339 4380 w
10 /LucidaSansUnicode00 f
(then) 2958 4380 w
(passes) 3218 4380 w
(the) 3588 4380 w
(original) 3786 4380 w
(string) 4198 4380 w
(to) 4524 4380 w
(another) 4666 4380 w
(process) 720 4500 w
(on) 1154 4500 w
(the) 1337 4500 w
(same) 1552 4500 w
(machine,) 1867 4500 w
(running) 2367 4500 w
(as) 2807 4500 w
(user) 2972 4500 w
10 /LucidaSans-Italic f
(userid1) 3241 4500 w
10 /LucidaSansUnicode00 f
(,) 3606 4500 w
(which) 3697 4500 w
(writes) 4037 4500 w
(the) 4387 4500 w
(string) 4601 4500 w
(to) 4942 4500 w
10 /LucidaTypewriter f
(/dev/capuse) 720 4620 w
10 /LucidaSansUnicode00 f
(.) 1512 4620 w
(The) 1612 4620 w
(kernel) 1829 4620 w
(hashes) 2167 4620 w
(the) 2540 4620 w
(string) 2731 4620 w
(and) 3049 4620 w
(looks) 3265 4620 w
(for) 3561 4620 w
(a) 3736 4620 w
(matching) 3827 4620 w
(hash) 4314 4620 w
(in) 4580 4620 w
(its) 4708 4620 w
(list.) 4862 4620 w
(If) 720 4740 w
(it) 837 4740 w
(finds) 954 4740 w
(one,) 1247 4740 w
(the) 1509 4740 w
(writing) 1715 4740 w
(process) 2103 4740 w
10 /LucidaSansUnicode20 f
(\031) 2477 4740 w
10 /LucidaSansUnicode00 f
(s) 2509 4740 w
(user) 2611 4740 w
(id) 2872 4740 w
(changes) 3015 4740 w
(from) 3465 4740 w
10 /LucidaSans-Italic f
(userid1) 3748 4740 w
10 /LucidaSansUnicode00 f
(to) 4164 4740 w
10 /LucidaSans-Italic f
(userid2) 4313 4740 w
10 /LucidaSansUnicode00 f
(.) 4678 4740 w
(Once) 4793 4740 w
(used, or if a timeout expires, the capability is discarded by the kernel.) 720 4860 w
(The) 720 5016 w
(capabilities) 934 5016 w
(are) 1514 5016 w
(hashed) 1699 5016 w
(to) 2081 5016 w
(keep) 2212 5016 w
(them) 2478 5016 w
(secret) 2759 5016 w
(if) 3084 5016 w
(someone) 3183 5016 w
(is) 3656 5016 w
(spying) 3769 5016 w
(on) 4121 5016 w
(kernel) 4277 5016 w
(memory.) 4612 5016 w
(Also,) 720 5136 w
(they) 997 5136 w
(are) 1239 5136 w
(local) 1426 5136 w
(to) 1686 5136 w
(the) 1819 5136 w
(machine) 2009 5136 w
(on) 2452 5136 w
(which) 2610 5136 w
(they) 2926 5136 w
(are) 3167 5136 w
(created.) 3353 5136 w
(Hence) 3810 5136 w
(a) 4143 5136 w
10 /LucidaTypewriter f
(factotum) 4232 5136 w
10 /LucidaSansUnicode00 f
(run\255) 4842 5136 w
(ning) 720 5256 w
(on) 976 5256 w
(one) 1140 5256 w
(system) 1360 5256 w
(cannot) 1741 5256 w
(pass) 2110 5256 w
(capabilities) 2371 5256 w
(to) 2960 5256 w
(processes) 3100 5256 w
(on) 3623 5256 w
(another) 3788 5256 w
(and) 4204 5256 w
(expect) 4426 5256 w
(them) 4792 5256 w
(to work.) 720 5376 w
(Keys) 1183 5376 w
(We) 720 5532 w
(define) 899 5532 w
(the) 1239 5532 w
(word) 1431 5532 w
10 /LucidaSans-Italic f
(key) 1710 5532 w
10 /LucidaSansUnicode00 f
(to) 1913 5532 w
(mean) 2048 5532 w
(not) 2351 5532 w
(only) 2548 5532 w
(a) 2789 5532 w
(secret,) 2881 5532 w
(but) 3242 5532 w
(also) 3441 5532 w
(a) 3674 5532 w
(description) 3766 5532 w
(of) 4346 5532 w
(the) 4482 5532 w
(context) 4675 5532 w
(in) 720 5652 w
(which) 858 5652 w
(that) 1186 5652 w
(secret) 1424 5652 w
(is) 1763 5652 w
(to) 1890 5652 w
(be) 2035 5652 w
(used:) 2201 5652 w
(the) 2511 5652 w
(protocol,) 2712 5652 w
(server,) 3194 5652 w
(user,) 3569 5652 w
(etc.) 3857 5652 w
(to) 4079 5652 w
(which) 4223 5652 w
(it) 4550 5652 w
(applies.) 4662 5652 w
(That) 720 5772 w
(is,) 980 5772 w
(a) 1135 5772 w
(key) 1233 5772 w
(is) 1442 5772 w
(a) 1565 5772 w
(combination) 1663 5772 w
(of) 2309 5772 w
(secret) 2450 5772 w
(and) 2785 5772 w
(descriptive) 3008 5772 w
(information) 3579 5772 w
(used) 4189 5772 w
(to) 4465 5772 w
(authenti\255) 4607 5772 w
(cate) 720 5892 w
(the) 954 5892 w
(identities) 1144 5892 w
(of) 1628 5892 w
(parties) 1761 5892 w
(transmitting) 2128 5892 w
(or) 2758 5892 w
(receiving) 2895 5892 w
(information.) 3367 5892 w
(The) 4032 5892 w
(set) 4247 5892 w
(of) 4425 5892 w
(keys) 4557 5892 w
(used) 4808 5892 w
(in) 720 6012 w
(any) 856 6012 w
(authentication) 1070 6012 w
(depends) 1810 6012 w
(both) 2269 6012 w
(on) 2537 6012 w
(the) 2705 6012 w
(protocol) 2905 6012 w
(and) 3354 6012 w
(on) 3579 6012 w
(parameters) 3747 6012 w
(passed) 4340 6012 w
(by) 4724 6012 w
(the) 4885 6012 w
(program requesting the authentication.) 720 6132 w
(Taking) 720 6288 w
(a) 1113 6288 w
(tip) 1232 6288 w
(from) 1425 6288 w
(SDSI) 1721 6288 w
([RiLa],) 1997 6288 w
(which) 2359 6288 w
(represents) 2704 6288 w
(security) 3282 6288 w
(information) 3725 6288 w
(as) 4356 6288 w
(textual) 4526 6288 w
(S-) 4928 6288 w
(expressions,) 720 6408 w
(keys) 1378 6408 w
(in) 1639 6408 w
(Plan) 1774 6408 w
(9) 2019 6408 w
(are) 2126 6408 w
(represented) 2322 6408 w
(as) 2947 6408 w
(plain) 3096 6408 w
(UTF-8) 3377 6408 w
(text.) 3727 6408 w
(Text) 4025 6408 w
(is) 4285 6408 w
(easily) 4408 6408 w
(under\255) 4723 6408 w
(stood) 720 6528 w
(and) 1029 6528 w
(manipulated) 1245 6528 w
(by) 1886 6528 w
(users.) 2038 6528 w
(By) 2400 6528 w
(contrast,) 2547 6528 w
(a) 3011 6528 w
(binary) 3103 6528 w
(or) 3442 6528 w
(other) 3581 6528 w
(cryptic) 3875 6528 w
(format) 4236 6528 w
(can) 4597 6528 w
(actu\255) 4802 6528 w
(ally) 720 6648 w
(reduce) 932 6648 w
(overall) 1308 6648 w
(security.) 1678 6648 w
(Binary) 2168 6648 w
(formats) 2512 6648 w
(are) 2934 6648 w
(difficult) 3132 6648 w
(for) 3552 6648 w
(users) 3737 6648 w
(to) 4044 6648 w
(examine) 4188 6648 w
(and) 4646 6648 w
(can) 4872 6648 w
(only) 720 6768 w
(be) 978 6768 w
(cracked) 1151 6768 w
(by) 1580 6768 w
(special) 1750 6768 w
(tools,) 2139 6768 w
(themselves) 2465 6768 w
(poorly) 3063 6768 w
(understood) 3425 6768 w
(by) 4037 6768 w
(most) 4207 6768 w
(users.) 4504 6768 w
(For) 4884 6768 w
(example,) 720 6888 w
(very) 1219 6888 w
(few) 1474 6888 w
(people) 1698 6888 w
(know) 2080 6888 w
(or) 2392 6888 w
(understand) 2548 6888 w
(what) 3153 6888 w
10 /LucidaSansUnicode20 f
(\031) 3384 6888 w
10 /LucidaSansUnicode00 f
(s) 3416 6888 w
(inside) 3520 6888 w
(their) 3863 6888 w
(X.509) 4141 6888 w
(certificates.) 4478 6888 w
(Most) 720 7008 w
(don) 995 7008 w
10 /LucidaSansUnicode20 f
(\031) 1181 7008 w
10 /LucidaSansUnicode00 f
(t) 1213 7008 w
(even) 1290 7008 w
(know) 1556 7008 w
(where) 1854 7008 w
(in) 2186 7008 w
(the) 2317 7008 w
(system) 2512 7008 w
(to) 2892 7008 w
(find) 3030 7008 w
(them.) 3261 7008 w
(Therefore,) 3613 7008 w
(they) 4159 7008 w
(have) 4407 7008 w
(no) 4673 7008 w
(idea) 4837 7008 w
(what) 720 7128 w
(they) 993 7128 w
(are) 1242 7128 w
(trusting,) 1436 7128 w
(and) 1891 7128 w
(why,) 2113 7128 w
(and) 2378 7128 w
(are) 2600 7128 w
(powerless) 2793 7128 w
(to) 3319 7128 w
(change) 3458 7128 w
(their) 3847 7128 w
(trust) 4113 7128 w
(relationships.) 4382 7128 w
(Textual, centrally stored and managed keys are easier to use and safer.) 720 7248 w
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6 pagesetup
10 /LucidaSansUnicode00 f
(\255 6 \255) 2783 480 w
(Plan) 720 840 w
(9) 965 840 w
(has) 1072 840 w
(historically) 1284 840 w
(represented) 1854 840 w
(databases) 2480 840 w
(as) 3010 840 w
(attribute/value) 3160 840 w
(pairs,) 3928 840 w
(since) 4243 840 w
(they) 4536 840 w
(are) 4788 840 w
(a) 4985 840 w
(good) 720 960 w
(foundation) 1013 960 w
(for) 1588 960 w
(selection) 1773 960 w
(and) 2251 960 w
(projection) 2476 960 w
(operations.) 3012 960 w
10 /LucidaTypewriter f
(Factotum) 3637 960 w
10 /LucidaSansUnicode00 f
(therefore) 4258 960 w
(repre\255) 4750 960 w
(sents) 720 1080 w
(the) 1022 1080 w
(keys) 1222 1080 w
(in) 1484 1080 w
(the) 1620 1080 w
(format) 1820 1080 w
10 /LucidaSans-Italic f
(attribute) 2189 1080 w
10 /LucidaTypewriter f
(=) 2617 1080 w
10 /LucidaSans-Italic f
(value) 2689 1080 w
10 /LucidaSansUnicode00 f
(,) 2948 1080 w
(where) 3025 1080 w
10 /LucidaSans-Italic f
(attribute) 3362 1080 w
10 /LucidaSansUnicode00 f
(is) 3835 1080 w
(an) 3961 1080 w
(identifier,) 4124 1080 w
(possibly) 4641 1080 w
(with) 720 1200 w
(a) 964 1200 w
(single-character) 1058 1200 w
(prefix,) 1893 1200 w
(and) 2251 1200 w
10 /LucidaSans-Italic f
(value) 2470 1200 w
10 /LucidaSansUnicode00 f
(is) 2768 1200 w
(an) 2887 1200 w
(arbitrary) 3043 1200 w
(quoted) 3496 1200 w
(string.) 3877 1200 w
(The) 4262 1200 w
(pairs) 4482 1200 w
(them\255) 4759 1200 w
(selves) 720 1320 w
(are) 1051 1320 w
(separated) 1240 1320 w
(by) 1754 1320 w
(white) 1906 1320 w
(space.) 2204 1320 w
(For) 2581 1320 w
(example,) 2774 1320 w
(a) 3256 1320 w
(Plan) 3348 1320 w
(9) 3586 1320 w
(key) 3686 1320 w
(and) 3889 1320 w
(an) 4106 1320 w
(APOP) 4260 1320 w
(key) 4554 1320 w
(might) 4757 1320 w
(be represented like this:) 720 1440 w
9 /LucidaTypewriter f
(dom=bell-labs.com) 1008 1610 w
(proto=p9sk1) 2178 1610 w
(user=gre) 2958 1610 w
(!password='don''t) 1528 1720 w
(tell') 2698 1720 w
(proto=apop) 1008 1830 w
(server=x.y.com) 1723 1830 w
(user=gre) 2698 1830 w
(!password='bite) 1528 1940 w
(me') 2568 1940 w
10 /LucidaSansUnicode00 f
(If) 720 2120 w
(a) 825 2120 w
(value) 919 2120 w
(is) 1212 2120 w
(empty) 1331 2120 w
(or) 1671 2120 w
(contains) 1812 2120 w
(white) 2259 2120 w
(space) 2559 2120 w
(or) 2875 2120 w
(single) 3017 2120 w
(quotes,) 3346 2120 w
(it) 3748 2120 w
(must) 3854 2120 w
(be) 4137 2120 w
(quoted;) 4296 2120 w
(quotes) 4710 2120 w
(are) 720 2240 w
(represented) 921 2240 w
(by) 1552 2240 w
(doubled) 1716 2240 w
(single) 2162 2240 w
(quotes.) 2500 2240 w
(Attributes) 2943 2240 w
(that) 3474 2240 w
(begin) 3713 2240 w
(with) 4033 2240 w
(an) 4286 2240 w
(exclamation) 4451 2240 w
(mark) 720 2360 w
(\() 1022 2360 w
10 /LucidaTypewriter f
(!) 1055 2360 w
10 /LucidaSansUnicode00 f
(\)) 1127 2360 w
(are) 1215 2360 w
(considered) 1422 2360 w
10 /LucidaSans-Italic f
(secret) 2010 2360 w
10 /LucidaSansUnicode00 f
(.) 2301 2360 w
10 /LucidaTypewriter f
(Factotum) 2420 2360 w
10 /LucidaSansUnicode00 f
(will) 3051 2360 w
(never) 3270 2360 w
(let) 3592 2360 w
(a) 3769 2360 w
(secret) 3879 2360 w
(value) 4226 2360 w
(escape) 4535 2360 w
(its) 4923 2360 w
(address space and will suppress keyboard echo when asking the user to type one.) 720 2480 w
(A) 720 2636 w
(program) 835 2636 w
(requesting) 1297 2636 w
(authentication) 1862 2636 w
(selects) 2603 2636 w
(a) 2980 2636 w
(key) 3082 2636 w
(by) 3295 2636 w
(providing) 3457 2636 w
(a) 3966 2636 w
10 /LucidaSans-Italic f
(query) 4068 2636 w
10 /LucidaSansUnicode00 f
(,) 4347 2636 w
(a) 4426 2636 w
(list) 4528 2636 w
(of) 4721 2636 w
(ele\255) 4866 2636 w
(ments) 720 2756 w
(to) 1063 2756 w
(be) 1205 2756 w
(matched) 1367 2756 w
(by) 1827 2756 w
(the) 1985 2756 w
(key.) 2183 2756 w
(Each) 2456 2756 w
(element) 2721 2756 w
(in) 3153 2756 w
(the) 3287 2756 w
(list) 3485 2756 w
(is) 3674 2756 w
(either) 3797 2756 w
(an) 4121 2756 w
10 /LucidaSans-Italic f
(attribute) 4281 2756 w
10 /LucidaTypewriter f
(=) 4709 2756 w
10 /LucidaSans-Italic f
(value) 4781 2756 w
10 /LucidaSansUnicode00 f
(pair,) 720 2876 w
(which) 974 2876 w
(is) 1289 2876 w
(satisfied) 1404 2876 w
(by) 1847 2876 w
(keys) 1997 2876 w
(with) 2249 2876 w
(exactly) 2489 2876 w
(that) 2865 2876 w
(pair;) 3091 2876 w
(or) 3346 2876 w
(an) 3483 2876 w
(attribute) 3635 2876 w
(followed) 4087 2876 w
(by) 4535 2876 w
(a) 4685 2876 w
(ques\255) 4775 2876 w
(tion) 720 2996 w
(mark,) 946 2996 w
10 /LucidaSans-Italic f
(attribute) 1261 2996 w
10 /LucidaTypewriter f
(?) 1689 2996 w
10 /LucidaSansUnicode00 f
(,) 1761 2996 w
(which) 1829 2996 w
(is) 2146 2996 w
(satisfied) 2262 2996 w
(by) 2706 2996 w
(keys) 2857 2996 w
(with) 3110 2996 w
(some) 3351 2996 w
(pair) 3648 2996 w
(specifying) 3872 2996 w
(the) 4400 2996 w
(attribute.) 4591 2996 w
(A) 720 3116 w
(key) 822 3116 w
(matches) 1021 3116 w
(a) 1459 3116 w
(query) 1547 3116 w
(if) 1854 3116 w
(every) 1953 3116 w
(element) 2243 3116 w
(in) 2666 3116 w
(the) 2791 3116 w
(list) 2980 3116 w
(is) 3160 3116 w
(satisfied.) 3274 3116 w
(For) 3780 3116 w
(instance,) 3970 3116 w
(to) 4439 3116 w
(select) 4571 3116 w
(the) 4885 3116 w
(APOP key in the previous example, an APOP client process might specify the query) 720 3236 w
9 /LucidaTypewriter f
(server=x.y.com) 1008 3406 w
(proto=apop) 1983 3406 w
10 /LucidaSansUnicode00 f
(Internally,) 720 3586 w
10 /LucidaTypewriter f
(factotum) 1239 3586 w
10 /LucidaSansUnicode20 f
(\031) 1815 3586 w
10 /LucidaSansUnicode00 f
(s) 1847 3586 w
(APOP) 1933 3586 w
(module) 2225 3586 w
(would) 2625 3586 w
(add) 2953 3586 w
(the) 3170 3586 w
(requirements) 3361 3586 w
(of) 4044 3586 w
(having) 4178 3586 w
10 /LucidaTypewriter f
(user) 4536 3586 w
10 /LucidaSansUnicode00 f
(and) 4860 3586 w
10 /LucidaTypewriter f
(!password) 720 3706 w
10 /LucidaSansUnicode00 f
(attributes, forming the query) 1400 3706 w
9 /LucidaTypewriter f
(server=x.y.com) 1008 3876 w
(proto=apop) 1983 3876 w
(user?) 2698 3876 w
(!password?) 3088 3876 w
10 /LucidaSansUnicode00 f
(when searching for an appropriate key.) 720 4056 w
10 /LucidaTypewriter f
(Factotum) 720 4212 w
10 /LucidaSansUnicode00 f
(modules expect keys to have some) 1328 4212 w
(well-known) 3061 4212 w
(attributes.) 3663 4212 w
(For) 4228 4212 w
(instance,) 4417 4212 w
(the) 4885 4212 w
10 /LucidaTypewriter f
(proto) 720 4332 w
10 /LucidaSansUnicode00 f
(attribute) 1127 4332 w
(specifies) 1591 4332 w
(the) 2061 4332 w
(protocol) 2263 4332 w
(module) 2714 4332 w
(responsible) 3125 4332 w
(for) 3734 4332 w
(using) 3920 4332 w
(a) 4232 4332 w
(particular) 4333 4332 w
(key,) 4842 4332 w
(and) 720 4452 w
(protocol) 951 4452 w
(modules) 1406 4452 w
(may) 1872 4452 w
(expect) 2124 4452 w
(other) 2500 4452 w
(well-known) 2809 4452 w
(attributes) 3430 4452 w
(\(many) 3950 4452 w
(expect) 4297 4452 w
(keys) 4673 4452 w
(to) 4942 4452 w
(have) 720 4572 w
10 /LucidaTypewriter f
(!password) 988 4572 w
10 /LucidaSansUnicode00 f
(attributes,) 1679 4572 w
(for) 2222 4572 w
(example\).) 2404 4572 w
(Additional) 2957 4572 w
(attributes) 3497 4572 w
(can) 4008 4572 w
(be) 4219 4572 w
(used) 4380 4572 w
(as) 4654 4572 w
(com\255) 4802 4572 w
(ments) 720 4692 w
(or) 1068 4692 w
(for) 1219 4692 w
(further) 1407 4692 w
(discrimination) 1792 4692 w
(without) 2534 4692 w
(intervention) 2949 4692 w
(by) 3583 4692 w
10 /LucidaTypewriter f
(factotum) 3748 4692 w
10 /LucidaSansUnicode00 f
(;) 4324 4692 w
(for) 4406 4692 w
(example,) 4595 4692 w
(the) 720 4812 w
(APOP) 915 4812 w
(and) 1212 4812 w
(IMAP) 1432 4812 w
(mail) 1711 4812 w
(clients) 1957 4812 w
(conventionally) 2312 4812 w
(include) 3050 4812 w
(a) 3442 4812 w
10 /LucidaTypewriter f
(server) 3537 4812 w
10 /LucidaSansUnicode00 f
(attribute) 4009 4812 w
(to) 4466 4812 w
(select) 4604 4812 w
(an) 4923 4812 w
(appropriate key for authentication.) 720 4932 w
(Unlike) 720 5088 w
(in) 1056 5088 w
(SDSI,) 1181 5088 w
(keys) 1459 5088 w
(in) 1710 5088 w
(Plan) 1835 5088 w
(9) 2070 5088 w
(have) 2167 5088 w
(no) 2426 5088 w
(nested) 2583 5088 w
(structure.) 2942 5088 w
(This) 3478 5088 w
(design) 3717 5088 w
(keeps) 4074 5088 w
(the) 4392 5088 w
(represen\255) 4581 5088 w
(tation) 720 5208 w
(simple) 1044 5208 w
(and) 1408 5208 w
(straightforward.) 1631 5208 w
(If) 2487 5208 w
(necessary,) 2595 5208 w
(we) 3144 5208 w
(could) 3319 5208 w
(add) 3627 5208 w
(a) 3850 5208 w
(nested) 3947 5208 w
(attribute) 4314 5208 w
(or,) 4773 5208 w
(in) 4949 5208 w
(the manner of relational databases, an attribute that) 720 5328 w
(selects) 3296 5328 w
(another) 3660 5328 w
(tuple,) 4067 5328 w
(but) 4379 5328 w
(so) 4574 5328 w
(far) 4719 5328 w
(the) 4885 5328 w
(simple design has been sufficient.) 720 5448 w
(A) 720 5604 w
(simple) 833 5604 w
(common) 1198 5604 w
(structure) 1663 5604 w
(for) 2145 5604 w
(all) 2328 5604 w
(keys) 2485 5604 w
(makes) 2746 5604 w
(them) 3103 5604 w
(easy) 3395 5604 w
(for) 3653 5604 w
(users) 3836 5604 w
(to) 4142 5604 w
(administer,) 4285 5604 w
(but) 4878 5604 w
(the) 720 5724 w
(set) 914 5724 w
(of) 1097 5724 w
(attributes) 1234 5724 w
(and) 1741 5724 w
(their) 1960 5724 w
(interpretation) 2224 5724 w
(is) 2929 5724 w
(still) 3048 5724 w
(protocol-specific) 3262 5724 w
(and) 4129 5724 w
(can) 4347 5724 w
(be) 4553 5724 w
(subtle.) 4710 5724 w
(Users) 720 5844 w
(may) 1042 5844 w
(still) 1296 5844 w
(need) 1525 5844 w
(to) 1816 5844 w
(consult) 1968 5844 w
(a) 2375 5844 w
(manual) 2484 5844 w
(to) 2895 5844 w
(understand) 3048 5844 w
(all) 3655 5844 w
(details.) 3823 5844 w
(Many) 4262 5844 w
(attributes) 4572 5844 w
(\() 720 5964 w
10 /LucidaTypewriter f
(proto) 753 5964 w
10 /LucidaSansUnicode00 f
(,) 1113 5964 w
10 /LucidaTypewriter f
(user) 1192 5964 w
10 /LucidaSansUnicode00 f
(,) 1480 5964 w
10 /LucidaTypewriter f
(password) 1559 5964 w
10 /LucidaSansUnicode00 f
(,) 2135 5964 w
10 /LucidaTypewriter f
(server) 2214 5964 w
10 /LucidaSansUnicode00 f
(\)) 2646 5964 w
(are) 2726 5964 w
(self-explanatory) 2925 5964 w
(and) 3775 5964 w
(our) 4001 5964 w
(short) 4211 5964 w
(experience) 4509 5964 w
(has) 720 6084 w
(not) 926 6084 w
(uncovered) 1124 6084 w
(any) 1666 6084 w
(particular) 1873 6084 w
(difficulty) 2374 6084 w
(in) 2838 6084 w
(handling) 2967 6084 w
(keys.) 3430 6084 w
(Things) 3750 6084 w
(will) 4118 6084 w
(likely) 4321 6084 w
(get) 4613 6084 w
(mes\255) 4807 6084 w
(sier,) 720 6204 w
(however,) 965 6204 w
(when) 1438 6204 w
(we) 1731 6204 w
(grapple) 1900 6204 w
(with) 2305 6204 w
(public) 2546 6204 w
(keys) 2878 6204 w
(and) 3130 6204 w
(their) 3345 6204 w
(myriad) 3605 6204 w
(components.) 3973 6204 w
(Protect\255) 4669 6204 w
(ing keys) 720 6324 w
(Secrets must be prevented from escaping) 720 6480 w
10 /LucidaTypewriter f
(factotum) 2767 6480 w
10 /LucidaSansUnicode00 f
(.) 3343 6480 w
(There) 3440 6480 w
(are) 3751 6480 w
(a) 3936 6480 w
(number) 4024 6480 w
(of) 4434 6480 w
(ways) 4565 6480 w
(they) 4833 6480 w
(could) 720 6600 w
(leak:) 1024 6600 w
(another) 1292 6600 w
(process) 1704 6600 w
(might) 2116 6600 w
(be) 2437 6600 w
(able) 2594 6600 w
(to) 2834 6600 w
(debug) 2969 6600 w
(the) 3312 6600 w
(agent) 3504 6600 w
(process,) 3813 6600 w
(the) 4256 6600 w
(agent) 4448 6600 w
(might) 4757 6600 w
(swap) 720 6720 w
(out) 1001 6720 w
(to) 1196 6720 w
(disk,) 1329 6720 w
(or) 1597 6720 w
(the) 1735 6720 w
(process) 1926 6720 w
(might) 2336 6720 w
(willingly) 2655 6720 w
(disclose) 3089 6720 w
(the) 3516 6720 w
(key.) 3707 6720 w
(The) 3973 6720 w
(last) 4190 6720 w
(is) 4398 6720 w
(the) 4514 6720 w
(easiest) 4705 6720 w
(to avoid: secret information in a key is marked as such, and whenever) 720 6840 w
10 /LucidaTypewriter f
(factotum) 4149 6840 w
10 /LucidaSansUnicode00 f
(prints) 4757 6840 w
(keys) 720 6960 w
(or) 978 6960 w
(queries) 1121 6960 w
(for) 1520 6960 w
(new) 1700 6960 w
(ones,) 1936 6960 w
(it) 2239 6960 w
(is) 2346 6960 w
(careful) 2467 6960 w
(to) 2840 6960 w
(avoid) 2980 6960 w
(displaying) 3282 6960 w
(secret) 3819 6960 w
(information.) 4153 6960 w
(\(The) 4826 6960 w
(only) 720 7080 w
(exception) 967 7080 w
(to) 1486 7080 w
(this) 1627 7080 w
(is) 1849 7080 w
(the) 1972 7080 w
10 /LucidaSansUnicode20 f
(\030\030) 2170 7080 w
10 /LucidaSansUnicode00 f
(plaintext) 2234 7080 w
(password) 2706 7080 w
10 /LucidaSansUnicode20 f
(\031\031) 3168 7080 w
10 /LucidaSansUnicode00 f
(protocol,) 3275 7080 w
(which) 3754 7080 w
(consists) 4078 7080 w
(of) 4514 7080 w
(sending) 4655 7080 w
(the) 720 7200 w
(values) 964 7200 w
(of) 1358 7200 w
(the) 1545 7200 w
10 /LucidaTypewriter f
(user) 1789 7200 w
10 /LucidaSansUnicode00 f
(and) 2166 7200 w
10 /LucidaTypewriter f
(!password) 2435 7200 w
10 /LucidaSansUnicode00 f
(attributes.) 3172 7200 w
(Only) 3793 7200 w
(keys) 4103 7200 w
(tagged) 4410 7200 w
(with) 4835 7200 w
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10 /LucidaSansUnicode00 f
(\255 7 \255) 2783 480 w
10 /LucidaTypewriter f
(proto=pass) 720 840 w
10 /LucidaSansUnicode00 f
(can have their passwords disclosed by this mechanism.\)) 1472 840 w
(Preventing) 720 996 w
(the) 1267 996 w
(first) 1457 996 w
(two) 1687 996 w
(forms) 1897 996 w
(of) 2215 996 w
(leakage) 2348 996 w
(requires) 2754 996 w
(help) 3188 996 w
(from) 3433 996 w
(the) 3700 996 w
(kernel.) 3890 996 w
(In) 4291 996 w
(Plan) 4417 996 w
(9,) 4653 996 w
(every) 4783 996 w
(process) 720 1116 w
(is) 1136 1116 w
(represented) 1258 1116 w
(by) 1882 1116 w
(a) 2039 1116 w
(directory) 2136 1116 w
(in) 2609 1116 w
(the) 2742 1116 w
10 /LucidaTypewriter f
(/proc) 2938 1116 w
10 /LucidaSansUnicode00 f
(file) 3339 1116 w
(system.) 3531 1116 w
(Using) 3976 1116 w
(the) 4290 1116 w
(files) 4486 1116 w
(in) 4729 1116 w
(this) 4861 1116 w
(directory,) 720 1236 w
(other) 1277 1236 w
(processes) 1628 1236 w
(could) 2203 1236 w
(\(with) 2563 1236 w
(appropriate) 2895 1236 w
(access) 3554 1236 w
(permission\)) 3964 1236 w
(examine) 4628 1236 w
10 /LucidaTypewriter f
(factotum) 720 1356 w
10 /LucidaSansUnicode20 f
(\031) 1296 1356 w
10 /LucidaSansUnicode00 f
(s) 1328 1356 w
(memory) 1420 1356 w
(and) 1857 1356 w
(registers.) 2078 1356 w
10 /LucidaTypewriter f
(Factotum) 2607 1356 w
10 /LucidaSansUnicode00 f
(is) 3224 1356 w
(protected) 3345 1356 w
(from) 3851 1356 w
(processes) 4124 1356 w
(of) 4645 1356 w
(other) 4783 1356 w
(users) 720 1476 w
(by) 1017 1476 w
(the) 1168 1476 w
(default) 1359 1476 w
(access) 1734 1476 w
(bits) 2085 1476 w
(of) 2301 1476 w
(its) 2435 1476 w
10 /LucidaTypewriter f
(/proc) 2588 1476 w
10 /LucidaSansUnicode00 f
(directory.) 2984 1476 w
(However,) 3515 1476 w
(we) 4000 1476 w
10 /LucidaSansUnicode20 f
(\031) 4133 1476 w
10 /LucidaSansUnicode00 f
(d) 4165 1476 w
(also) 4265 1476 w
(like) 4498 1476 w
(to) 4707 1476 w
(pro\255) 4842 1476 w
(tect) 720 1596 w
(the) 937 1596 w
(agent) 1128 1596 w
(from) 1436 1596 w
(other) 1704 1596 w
(processes) 1997 1596 w
(owned) 2514 1596 w
(by) 2869 1596 w
(the) 3020 1596 w
(same) 3211 1596 w
(user,) 3502 1596 w
(both) 3780 1596 w
(to) 4039 1596 w
(avoid) 4173 1596 w
(honest) 4469 1596 w
(mis\255) 4834 1596 w
(takes) 720 1716 w
(and) 1024 1716 w
(to) 1251 1716 w
(prevent) 1396 1716 w
(an) 1810 1716 w
(unattended) 1975 1716 w
(terminal) 2576 1716 w
(being) 3026 1716 w
(exploited) 3346 1716 w
(to) 3849 1716 w
(discover) 3995 1716 w
(secret) 4447 1716 w
(pass\255) 4787 1716 w
(words.) 720 1836 w
(To) 1116 1836 w
(do) 1279 1836 w
(this,) 1442 1836 w
(we) 1692 1836 w
(added) 1864 1836 w
(a) 2203 1836 w
(control) 2297 1836 w
(message) 2677 1836 w
(to) 3139 1836 w
10 /LucidaTypewriter f
(/proc) 3275 1836 w
10 /LucidaSansUnicode00 f
(called) 3673 1836 w
10 /LucidaTypewriter f
(private) 3994 1836 w
10 /LucidaSansUnicode00 f
(.) 4498 1836 w
(Once) 4600 1836 w
(the) 4885 1836 w
10 /LucidaTypewriter f
(factotum) 720 1956 w
10 /LucidaSansUnicode00 f
(process) 1334 1956 w
(has) 1746 1956 w
(written) 1952 1956 w
10 /LucidaTypewriter f
(private) 2329 1956 w
10 /LucidaSansUnicode00 f
(to) 2872 1956 w
(its) 3009 1956 w
10 /LucidaTypewriter f
(/proc/) 3165 1956 w
10 /LucidaSans-Italic f
(pid) 3597 1956 w
10 /LucidaTypewriter f
(/ctl) 3748 1956 w
10 /LucidaSansUnicode00 f
(file,) 4075 1956 w
(no) 4297 1956 w
(process) 4459 1956 w
(can) 4872 1956 w
(access) 720 2076 w
10 /LucidaTypewriter f
(factotum) 1079 2076 w
10 /LucidaSansUnicode20 f
(\031) 1655 2076 w
10 /LucidaSansUnicode00 f
(s) 1687 2076 w
(memory) 1782 2076 w
(through) 2222 2076 w
10 /LucidaTypewriter f
(/proc) 2653 2076 w
10 /LucidaSansUnicode00 f
(.) 3013 2076 w
(\(Plan) 3121 2076 w
(9) 3399 2076 w
(has) 3506 2076 w
(no) 3718 2076 w
(other) 3885 2076 w
(mechanism,) 4186 2076 w
(such) 4814 2076 w
(as) 720 2196 w
10 /LucidaTypewriter f
(/dev/kmem) 858 2196 w
10 /LucidaSansUnicode00 f
(, for accessing a process) 1506 2196 w
10 /LucidaSansUnicode20 f
(\031) 2702 2196 w
10 /LucidaSansUnicode00 f
(s memory.\)) 2734 2196 w
(Similarly,) 720 2352 w
(the) 1201 2352 w
(agent) 1394 2352 w
10 /LucidaSansUnicode20 f
(\031) 1666 2352 w
10 /LucidaSansUnicode00 f
(s) 1698 2352 w
(address) 1787 2352 w
(space) 2205 2352 w
(should) 2519 2352 w
(not) 2885 2352 w
(be) 3084 2352 w
(swapped) 3242 2352 w
(out,) 3709 2352 w
(to) 3940 2352 w
(prevent) 4077 2352 w
(discovering) 4483 2352 w
(unencrypted) 720 2472 w
(keys) 1377 2472 w
(on) 1646 2472 w
(the) 1821 2472 w
(swapping) 2028 2472 w
(media.) 2542 2472 w
(The) 2954 2472 w
10 /LucidaTypewriter f
(noswap) 3187 2472 w
10 /LucidaSansUnicode00 f
(control) 3670 2472 w
(message) 4063 2472 w
(in) 4538 2472 w
10 /LucidaTypewriter f
(/proc) 4680 2472 w
10 /LucidaSansUnicode00 f
(prevents) 720 2592 w
(this) 1181 2592 w
(scenario.) 1403 2592 w
(Neither) 1916 2592 w
10 /LucidaTypewriter f
(private) 2314 2592 w
10 /LucidaSansUnicode00 f
(nor) 2861 2592 w
10 /LucidaTypewriter f
(noswap) 3068 2592 w
10 /LucidaSansUnicode00 f
(is) 3543 2592 w
(specific) 3666 2592 w
(to) 4077 2592 w
10 /LucidaTypewriter f
(factotum) 4219 2592 w
10 /LucidaSansUnicode00 f
(;) 4795 2592 w
(any) 4871 2592 w
(process) 720 2712 w
(can) 1133 2712 w
(use) 1340 2712 w
(them.) 1548 2712 w
(Both) 1899 2712 w
(are) 2156 2712 w
(useful,) 2347 2712 w
(for) 2715 2712 w
(instance,) 2893 2712 w
(to) 3367 2712 w
(protect) 3504 2712 w
(any) 3889 2712 w
(user-level) 4096 2712 w
(program) 4624 2712 w
(providing critical file services for the kernel.) 720 2832 w
(Despite) 720 2988 w
(our) 1121 2988 w
(precautions,) 1319 2988 w
(attackers) 1953 2988 w
(might) 2428 2988 w
(still) 2745 2988 w
(find) 2954 2988 w
(a) 3179 2988 w
(way) 3268 2988 w
(to) 3486 2988 w
(gain) 3618 2988 w
(access) 3860 2988 w
(to) 4210 2988 w
(a) 4343 2988 w
(process) 4433 2988 w
(run\255) 4842 2988 w
(ning) 720 3108 w
(as) 971 3108 w
(the) 1113 3108 w
(host) 1304 3108 w
(owner) 1551 3108 w
(on) 1884 3108 w
(a) 2043 3108 w
(machine.) 2134 3108 w
(Although) 2641 3108 w
(they) 3120 3108 w
(could) 3362 3108 w
(not) 3663 3108 w
(directly) 3858 3108 w
(access) 4251 3108 w
(the) 4601 3108 w
(keys,) 4791 3108 w
(attackers) 720 3228 w
(could) 1207 3228 w
(use) 1519 3228 w
(the) 1734 3228 w
(local) 1935 3228 w
10 /LucidaTypewriter f
(factotum) 2206 3228 w
10 /LucidaSansUnicode00 f
(to) 2828 3228 w
(perform) 2972 3228 w
(authentications) 3410 3228 w
(for) 4202 3228 w
(them.) 4388 3228 w
(In) 4747 3228 w
(the) 4885 3228 w
(case) 720 3348 w
(of) 972 3348 w
(some) 1109 3348 w
(keys,) 1409 3348 w
(for) 1697 3348 w
(example) 1875 3348 w
(those) 2327 3348 w
(locking) 2633 3348 w
(bank) 3024 3348 w
(accounts,) 3301 3348 w
(we) 3802 3348 w
(want) 3974 3348 w
(a) 4243 3348 w
(way) 4336 3348 w
(to) 4558 3348 w
(disable) 4694 3348 w
(or) 720 3468 w
(at) 874 3468 w
(least) 1018 3468 w
(detect) 1298 3468 w
(such) 1650 3468 w
(access.) 1928 3468 w
(That) 2359 3468 w
(is) 2628 3468 w
(the) 2760 3468 w
(role) 2967 3468 w
(of) 3206 3468 w
(the) 3356 3468 w
10 /LucidaTypewriter f
(confirm) 3563 3468 w
10 /LucidaSansUnicode00 f
(attribute) 4120 3468 w
(in) 4590 3468 w
(a) 4734 3468 w
(key.) 4842 3468 w
(Whenever) 720 3588 w
(a) 1229 3588 w
(key) 1322 3588 w
(with) 1526 3588 w
(a) 1769 3588 w
10 /LucidaTypewriter f
(confirm) 1862 3588 w
10 /LucidaSansUnicode00 f
(attribute) 2404 3588 w
(is) 2859 3588 w
(accessed,) 2976 3588 w
(the) 3479 3588 w
(local) 3671 3588 w
(user) 3933 3588 w
(must) 4180 3588 w
(confirm) 4460 3588 w
(use) 4871 3588 w
(of the key via a local GUI.) 720 3708 w
(The next section describes the actual mechanism.) 2013 3708 w
(We) 720 3864 w
(have) 905 3864 w
(not) 1173 3864 w
(addressed) 1376 3864 w
(leaks) 1918 3864 w
(possible) 2210 3864 w
(as) 2656 3864 w
(a) 2805 3864 w
(result) 2903 3864 w
(of) 3222 3864 w
(someone) 3364 3864 w
(rebooting) 3848 3864 w
(or) 4364 3864 w
(resetting) 4510 3864 w
(a) 4985 3864 w
(machine) 720 3984 w
(running) 1163 3984 w
10 /LucidaTypewriter f
(factotum) 1578 3984 w
10 /LucidaSansUnicode00 f
(.) 2154 3984 w
(For) 2253 3984 w
(example,) 2444 3984 w
(someone) 2924 3984 w
(could) 3399 3984 w
(reset) 3700 3984 w
(a) 3976 3984 w
(machine) 4065 3984 w
(and) 4507 3984 w
(reboot) 4721 3984 w
(it) 720 4104 w
(with) 824 4104 w
(a) 1067 4104 w
(debugger) 1160 4104 w
(instead) 1664 4104 w
(of) 2056 4104 w
(a) 2193 4104 w
(kernel,) 2287 4104 w
(allowing) 2660 4104 w
(them) 3103 4104 w
(to) 3390 4104 w
(examine) 3527 4104 w
(the) 3978 4104 w
(contents) 4172 4104 w
(of) 4628 4104 w
(mem\255) 4765 4104 w
(ory) 720 4224 w
(and) 910 4224 w
(find) 1126 4224 w
(keys.) 1353 4224 w
(We) 1670 4224 w
(have) 1848 4224 w
(not) 2109 4224 w
(found) 2305 4224 w
(a) 2626 4224 w
(satisfactory) 2717 4224 w
(solution) 3310 4224 w
(to) 3738 4224 w
(this) 3871 4224 w
(problem.) 4085 4224 w
(Factotum) 4590 4224 w
(transactions) 720 4344 w
(External) 720 4500 w
(programs) 1168 4500 w
(manage) 1688 4500 w
10 /LucidaTypewriter f
(factotum) 2124 4500 w
10 /LucidaSansUnicode20 f
(\031) 2700 4500 w
10 /LucidaSansUnicode00 f
(s) 2732 4500 w
(internal) 2836 4500 w
(key) 3260 4500 w
(state) 3479 4500 w
(through) 3768 4500 w
(its) 4208 4500 w
(file) 4379 4500 w
(interface,) 4584 4500 w
(writing) 720 4620 w
(textual) 1095 4620 w
10 /LucidaTypewriter f
(key) 1470 4620 w
10 /LucidaSansUnicode00 f
(and) 1724 4620 w
10 /LucidaTypewriter f
(delkey) 1942 4620 w
10 /LucidaSansUnicode00 f
(commands) 2412 4620 w
(to) 2979 4620 w
(the) 3115 4620 w
10 /LucidaTypewriter f
(/mnt/factotum/ctl) 3308 4620 w
10 /LucidaSansUnicode00 f
(file.) 4570 4620 w
(Both) 4822 4620 w
(commands) 720 4740 w
(take) 1292 4740 w
(a) 1541 4740 w
(list) 1640 4740 w
(of) 1830 4740 w
(attributes) 1972 4740 w
(as) 2484 4740 w
(an) 2634 4740 w
(argument.) 2795 4740 w
10 /LucidaTypewriter f
(Key) 3371 4740 w
10 /LucidaSansUnicode00 f
(creates) 3631 4740 w
(a) 4022 4740 w
(key) 4121 4740 w
(with) 4331 4740 w
(the) 4580 4740 w
(given) 4779 4740 w
(attributes,) 720 4860 w
(replacing) 1262 4860 w
(any) 1751 4860 w
(extant) 1961 4860 w
(key) 2310 4860 w
(with) 2517 4860 w
(an) 2763 4860 w
(identical) 2921 4860 w
(set) 3373 4860 w
(of) 3558 4860 w
(public) 3697 4860 w
(attributes.) 4035 4860 w
10 /LucidaTypewriter f
(Delkey) 4608 4860 w
10 /LucidaSansUnicode00 f
(deletes) 720 4980 w
(all) 1111 4980 w
(keys) 1267 4980 w
(that) 1527 4980 w
(match) 1761 4980 w
(the) 2102 4980 w
(given) 2300 4980 w
(set) 2604 4980 w
(of) 2791 4980 w
(attributes.) 2932 4980 w
(Reading) 3507 4980 w
(the) 3940 4980 w
10 /LucidaTypewriter f
(ctl) 4138 4980 w
10 /LucidaSansUnicode00 f
(file) 4397 4980 w
(returns) 4591 4980 w
(a) 4985 4980 w
(list) 720 5100 w
(of) 903 5100 w
(keys,) 1038 5100 w
(one) 1324 5100 w
(per) 1540 5100 w
(line,) 1737 5100 w
(displaying) 1982 5100 w
(only) 2514 5100 w
(public) 2755 5100 w
(attributes.) 3089 5100 w
(The) 3658 5100 w
(following) 3875 5100 w
(example) 4358 5100 w
(illus\255) 4807 5100 w
(trates these interactions.) 720 5220 w
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8 pagesetup
10 /LucidaSansUnicode00 f
(\255 8 \255) 2783 480 w
9 /LucidaTypewriter f
(%) 1008 830 w
(cd) 1138 830 w
(/mnt/factotum) 1333 830 w
(%) 1008 940 w
(ls) 1138 940 w
(-l) 1333 940 w
(-lrw-------) 1008 1050 w
(gre) 1788 1050 w
(gre) 2048 1050 w
(0) 2308 1050 w
(Jan) 2438 1050 w
(30) 2698 1050 w
(22:17) 2893 1050 w
(confirm) 3283 1050 w
(--rw-------) 1008 1160 w
(gre) 1788 1160 w
(gre) 2048 1160 w
(0) 2308 1160 w
(Jan) 2438 1160 w
(30) 2698 1160 w
(22:17) 2893 1160 w
(ctl) 3283 1160 w
(-lr--------) 1008 1270 w
(gre) 1788 1270 w
(gre) 2048 1270 w
(0) 2308 1270 w
(Jan) 2438 1270 w
(30) 2698 1270 w
(22:17) 2893 1270 w
(log) 3283 1270 w
(-lrw-------) 1008 1380 w
(gre) 1788 1380 w
(gre) 2048 1380 w
(0) 2308 1380 w
(Jan) 2438 1380 w
(30) 2698 1380 w
(22:17) 2893 1380 w
(needkey) 3283 1380 w
(--r--r--r--) 1008 1490 w
(gre) 1788 1490 w
(gre) 2048 1490 w
(0) 2308 1490 w
(Jan) 2438 1490 w
(30) 2698 1490 w
(22:17) 2893 1490 w
(proto) 3283 1490 w
(--rw-rw-rw-) 1008 1600 w
(gre) 1788 1600 w
(gre) 2048 1600 w
(0) 2308 1600 w
(Jan) 2438 1600 w
(30) 2698 1600 w
(22:17) 2893 1600 w
(rpc) 3283 1600 w
(%) 1008 1710 w
(cat) 1138 1710 w
(>ctl) 1398 1710 w
(key) 1008 1820 w
(dom=bell-labs.com) 1268 1820 w
(proto=p9sk1) 2438 1820 w
(user=gre) 3218 1820 w
(!password='don''t) 1268 1930 w
(tell') 2438 1930 w
(key) 1008 2040 w
(proto=apop) 1268 2040 w
(server=x.y.com) 1983 2040 w
(user=gre) 2958 2040 w
(!password='bite) 1268 2150 w
(me') 2308 2150 w
(^D) 1008 2260 w
(%) 1008 2370 w
(cat) 1138 2370 w
(ctl) 1398 2370 w
(key) 1008 2480 w
(dom=bell-labs.com) 1268 2480 w
(proto=p9sk1) 2438 2480 w
(user=gre) 3218 2480 w
(key) 1008 2590 w
(proto=apop) 1268 2590 w
(server=x.y.com) 1983 2590 w
(user=gre) 2958 2590 w
(%) 1008 2700 w
(echo) 1138 2700 w
('delkey) 1463 2700 w
(proto=apop') 1983 2700 w
(>ctl) 2763 2700 w
(%) 1008 2810 w
(cat) 1138 2810 w
(ctl) 1398 2810 w
(key) 1008 2920 w
(dom=bell-labs.com) 1268 2920 w
(proto=p9sk1) 2438 2920 w
(user=gre) 3218 2920 w
(%) 1008 3030 w
10 /LucidaSansUnicode00 f
(\(A file with the) 720 3210 w
10 /LucidaTypewriter f
(l) 1461 3210 w
10 /LucidaSansUnicode00 f
(bit set can be opened by only one process at a time.\)) 1565 3210 w
(The) 720 3366 w
(heart) 946 3366 w
(of) 1242 3366 w
(the) 1385 3366 w
(interface) 1585 3366 w
(is) 2054 3366 w
(the) 2179 3366 w
10 /LucidaTypewriter f
(rpc) 2379 3366 w
10 /LucidaSansUnicode00 f
(file.) 2641 3366 w
(Programs) 2902 3366 w
(authenticate) 3407 3366 w
(with) 4052 3366 w
10 /LucidaTypewriter f
(factotum) 4303 3366 w
10 /LucidaSansUnicode00 f
(by) 4925 3366 w
(writing) 720 3486 w
(a) 1096 3486 w
(request) 1190 3486 w
(to) 1595 3486 w
(the) 1732 3486 w
10 /LucidaTypewriter f
(rpc) 1926 3486 w
10 /LucidaSansUnicode00 f
(file) 2181 3486 w
(and) 2371 3486 w
(reading) 2590 3486 w
(back) 2997 3486 w
(the) 3263 3486 w
(reply;) 3457 3486 w
(this) 3769 3486 w
(sequence) 3987 3486 w
(is) 4483 3486 w
(called) 4602 3486 w
(an) 4923 3486 w
(RPC) 720 3606 w
10 /LucidaSans-Italic f
(transaction) 939 3606 w
10 /LucidaSansUnicode00 f
(.) 1494 3606 w
(Requests and replies have the same format: a textual verb possibly fol\255) 1590 3606 w
(lowed) 720 3726 w
(by) 1048 3726 w
(arguments,) 1205 3726 w
(which) 1798 3726 w
(may) 2121 3726 w
(be) 2363 3726 w
(textual) 2524 3726 w
(or) 2903 3726 w
(binary.) 3047 3726 w
(The) 3455 3726 w
(most) 3678 3726 w
(common) 3962 3726 w
(reply) 4425 3726 w
(verb) 4707 3726 w
(is) 4960 3726 w
10 /LucidaTypewriter f
(ok) 720 3846 w
10 /LucidaSansUnicode00 f
(,) 864 3846 w
(indicating) 930 3846 w
(success.) 1443 3846 w
(An) 1914 3846 w
(RPC) 2079 3846 w
(session) 2300 3846 w
(begins) 2695 3846 w
(with) 3052 3846 w
(a) 3291 3846 w
10 /LucidaTypewriter f
(start) 3380 3846 w
10 /LucidaSansUnicode00 f
(transaction;) 3774 3846 w
(the) 4382 3846 w
(argument) 4572 3846 w
(is) 720 3966 w
(a) 841 3966 w
(key) 936 3966 w
(query) 1142 3966 w
(as) 1456 3966 w
(described) 1602 3966 w
(earlier.) 2115 3966 w
(Once) 2526 3966 w
(started,) 2813 3966 w
(an) 3225 3966 w
(RPC) 3382 3966 w
(conversation) 3609 3966 w
(usually) 4267 3966 w
(consists) 4647 3966 w
(of) 720 4086 w
(a) 861 4086 w
(sequence) 959 4086 w
(of) 1459 4086 w
10 /LucidaTypewriter f
(read) 1600 4086 w
10 /LucidaSansUnicode00 f
(and) 1931 4086 w
10 /LucidaTypewriter f
(write) 2154 4086 w
10 /LucidaSansUnicode00 f
(transactions.) 2557 4086 w
(If) 3256 4086 w
(the) 3365 4086 w
(conversation) 3563 4086 w
(is) 4224 4086 w
(successful,) 4347 4086 w
(an) 4923 4086 w
10 /LucidaTypewriter f
(authinfo) 720 4206 w
10 /LucidaSansUnicode00 f
(transaction) 1342 4206 w
(will) 1929 4206 w
(return) 2139 4206 w
(information) 2484 4206 w
(about) 3097 4206 w
(the) 3420 4206 w
(identities) 3620 4206 w
(learned) 4114 4206 w
(during) 4521 4206 w
(the) 4885 4206 w
(transaction.) 720 4326 w
(The) 1365 4326 w
10 /LucidaTypewriter f
(attr) 1586 4326 w
10 /LucidaSansUnicode00 f
(transaction) 1914 4326 w
(returns) 2495 4326 w
(a) 2885 4326 w
(list) 2980 4326 w
(of) 3166 4326 w
(attributes) 3304 4326 w
(for) 3812 4326 w
(the) 3991 4326 w
(current) 4187 4326 w
(conversa\255) 4578 4326 w
(tion;) 720 4446 w
(the) 991 4446 w
(list) 1196 4446 w
(includes) 1392 4446 w
(any) 1845 4446 w
(attributes) 2064 4446 w
(given) 2582 4446 w
(in) 2893 4446 w
(the) 3034 4446 w
10 /LucidaTypewriter f
(start) 3239 4446 w
10 /LucidaSansUnicode00 f
(query) 3649 4446 w
(as) 3973 4446 w
(well) 4129 4446 w
(as) 4370 4446 w
(any) 4525 4446 w
(public) 4743 4446 w
(attributes from keys being used.) 720 4566 w
(As) 720 4722 w
(an) 891 4722 w
(example) 1059 4722 w
(of) 1524 4722 w
(the) 1674 4722 w
(RPC) 1881 4722 w
(file) 2120 4722 w
(in) 2323 4722 w
(action,) 2466 4722 w
(consider) 2845 4722 w
(a) 3311 4722 w
(mail) 3418 4722 w
(client) 3676 4722 w
(connecting) 3992 4722 w
(to) 4577 4722 w
(a) 4727 4722 w
(mail) 4834 4722 w
(server) 720 4842 w
(and) 1077 4842 w
(authenticating) 1316 4842 w
(using) 2071 4842 w
(the) 2396 4842 w
(POP3) 2610 4842 w
(protocol) 2920 4842 w
10 /LucidaSansUnicode20 f
(\031) 3324 4842 w
10 /LucidaSansUnicode00 f
(s) 3356 4842 w
(APOP) 3466 4842 w
(challenge-response) 3782 4842 w
(com\255) 4802 4842 w
(mand.) 720 4962 w
(There) 1094 4962 w
(are) 1409 4962 w
(four) 1598 4962 w
(programs) 1836 4962 w
(involved:) 2340 4962 w
(the) 2813 4962 w
(mail) 3005 4962 w
(client) 3249 4962 w
11 /LucidaSans-Italic f
(P) 3551 4962 w
8 /LucidaSans-Italic f
(C) 3628 4984 w
10 /LucidaSansUnicode00 f
(,) 3691 4962 w
(the) 3761 4962 w
(client) 3954 4962 w
10 /LucidaTypewriter f
(factotum) 4256 4962 w
11 /LucidaSans-Italic f
(F) 4873 4962 w
8 /LucidaSans-Italic f
(C) 4945 4984 w
10 /LucidaSansUnicode00 f
(,) 5008 4962 w
(the) 720 5082 w
(mail) 914 5082 w
(server) 1159 5082 w
11 /LucidaSans-Italic f
(P) 1495 5082 w
8 /LucidaSans-Italic f
(S) 1572 5104 w
10 /LucidaSansUnicode00 f
(,) 1625 5082 w
(and) 1696 5082 w
(the) 1915 5082 w
(server) 2109 5082 w
10 /LucidaTypewriter f
(factotum) 2445 5082 w
11 /LucidaSans-Italic f
(F) 3063 5082 w
8 /LucidaSans-Italic f
(S) 3135 5104 w
10 /LucidaSansUnicode00 f
(.) 3188 5082 w
(All) 3290 5082 w
(authentication) 3455 5082 w
(computations) 4188 5082 w
(are) 4888 5082 w
(handled) 720 5202 w
(by) 1159 5202 w
(the) 1323 5202 w
10 /LucidaTypewriter f
(factotum) 1527 5202 w
10 /LucidaSansUnicode00 f
(processes.) 2152 5202 w
(The) 2746 5202 w
(mail) 2976 5202 w
(programs) 3231 5202 w
10 /LucidaSansUnicode20 f
(\031) 3698 5202 w
10 /LucidaSansUnicode00 f
(role) 3779 5202 w
(is) 4016 5202 w
(just) 4146 5202 w
(to) 4376 5202 w
(relay) 4524 5202 w
(mes\255) 4807 5202 w
(sages.) 720 5322 w
(At) 720 5478 w
(startup,) 904 5478 w
(the) 1360 5478 w
(mail) 1593 5478 w
(server) 1878 5478 w
(at) 2254 5478 w
10 /LucidaTypewriter f
(x.y.com) 2425 5478 w
10 /LucidaSansUnicode00 f
(begins) 3008 5478 w
(an) 3410 5478 w
(APOP) 3606 5478 w
(conversation) 3942 5478 w
(with) 4639 5478 w
(its) 4923 5478 w
10 /LucidaTypewriter f
(factotum) 720 5598 w
10 /LucidaSansUnicode00 f
(to obtain the banner greeting, which includes a challenge:) 1328 5598 w
11 /LucidaSans-Italic f
(P) 1008 5768 w
8 /LucidaSans-Italic f
(S) 1085 5790 w
11 /S f
(\256) 1147 5768 w
11 /LucidaSans-Italic f
(F) 1265 5768 w
8 /LucidaSans-Italic f
(S) 1337 5790 w
9 /LucidaTypewriter f
(:) 1390 5768 w
(start) 1520 5768 w
(proto=apop) 1910 5768 w
(role=server) 2625 5768 w
11 /LucidaSans-Italic f
(F) 1008 5878 w
8 /LucidaSans-Italic f
(S) 1080 5900 w
11 /S f
(\256) 1142 5878 w
11 /LucidaSans-Italic f
(P) 1260 5878 w
8 /LucidaSans-Italic f
(S) 1337 5900 w
9 /LucidaTypewriter f
(:) 1390 5878 w
(ok) 1520 5878 w
11 /LucidaSans-Italic f
(P) 1008 5988 w
8 /LucidaSans-Italic f
(S) 1085 6010 w
11 /S f
(\256) 1147 5988 w
11 /LucidaSans-Italic f
(F) 1265 5988 w
8 /LucidaSans-Italic f
(S) 1337 6010 w
9 /LucidaTypewriter f
(:) 1390 5988 w
(read) 1520 5988 w
11 /LucidaSans-Italic f
(F) 1008 6098 w
8 /LucidaSans-Italic f
(S) 1080 6120 w
11 /S f
(\256) 1142 6098 w
11 /LucidaSans-Italic f
(P) 1260 6098 w
8 /LucidaSans-Italic f
(S) 1337 6120 w
9 /LucidaTypewriter f
(:) 1390 6098 w
(ok) 1520 6098 w
(+OK) 1715 6098 w
(POP3) 1975 6098 w
9 /LucidaSans-Italic f
(challenge) 2300 6098 w
10 /LucidaSansUnicode00 f
(Having obtained the challenge, the server greets the client:) 720 6278 w
11 /LucidaSans-Italic f
(P) 1008 6448 w
8 /LucidaSans-Italic f
(S) 1085 6470 w
11 /S f
(\256) 1147 6448 w
11 /LucidaSans-Italic f
(P) 1265 6448 w
8 /LucidaSans-Italic f
(C) 1342 6470 w
9 /LucidaTypewriter f
(:) 1405 6448 w
(+OK) 1535 6448 w
(POP3) 1795 6448 w
9 /LucidaSans-Italic f
(challenge) 2120 6448 w
10 /LucidaSansUnicode00 f
(The client then uses an APOP conversation with its) 720 6628 w
10 /LucidaTypewriter f
(factotum) 3204 6628 w
10 /LucidaSansUnicode00 f
(to obtain a response:) 3812 6628 w
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9 pagesetup
10 /LucidaSansUnicode00 f
(\255 9 \255) 2783 480 w
11 /LucidaSans-Italic f
(P) 1008 830 w
8 /LucidaSans-Italic f
(C) 1085 852 w
11 /S f
(\256) 1157 830 w
11 /LucidaSans-Italic f
(F) 1275 830 w
8 /LucidaSans-Italic f
(C) 1347 852 w
9 /LucidaTypewriter f
(:) 1410 830 w
(start) 1540 830 w
(proto=apop) 1930 830 w
(role=client) 2645 830 w
(server=x.y.com) 1788 940 w
11 /LucidaSans-Italic f
(F) 1008 1050 w
8 /LucidaSans-Italic f
(C) 1080 1072 w
11 /S f
(\256) 1152 1050 w
11 /LucidaSans-Italic f
(P) 1270 1050 w
8 /LucidaSans-Italic f
(C) 1347 1072 w
9 /LucidaTypewriter f
(:) 1410 1050 w
(ok) 1540 1050 w
11 /LucidaSans-Italic f
(P) 1008 1160 w
8 /LucidaSans-Italic f
(C) 1085 1182 w
11 /S f
(\256) 1157 1160 w
11 /LucidaSans-Italic f
(F) 1275 1160 w
8 /LucidaSans-Italic f
(C) 1347 1182 w
9 /LucidaTypewriter f
(:) 1410 1160 w
(write) 1540 1160 w
(+OK) 1930 1160 w
(POP3) 2190 1160 w
9 /LucidaSans-Italic f
(challenge) 2515 1160 w
11 /LucidaSans-Italic f
(F) 1008 1270 w
8 /LucidaSans-Italic f
(C) 1080 1292 w
11 /S f
(\256) 1152 1270 w
11 /LucidaSans-Italic f
(P) 1270 1270 w
8 /LucidaSans-Italic f
(C) 1347 1292 w
9 /LucidaTypewriter f
(:) 1410 1270 w
(ok) 1540 1270 w
11 /LucidaSans-Italic f
(P) 1008 1380 w
8 /LucidaSans-Italic f
(C) 1085 1402 w
11 /S f
(\256) 1157 1380 w
11 /LucidaSans-Italic f
(F) 1275 1380 w
8 /LucidaSans-Italic f
(C) 1347 1402 w
9 /LucidaTypewriter f
(:) 1410 1380 w
(read) 1540 1380 w
11 /LucidaSans-Italic f
(F) 1008 1490 w
8 /LucidaSans-Italic f
(C) 1080 1512 w
11 /S f
(\256) 1152 1490 w
11 /LucidaSans-Italic f
(P) 1270 1490 w
8 /LucidaSans-Italic f
(C) 1347 1512 w
9 /LucidaTypewriter f
(:) 1410 1490 w
(ok) 1540 1490 w
(APOP) 1735 1490 w
(gre) 2060 1490 w
9 /LucidaSans-Italic f
(response) 2320 1490 w
10 /LucidaTypewriter f
(Factotum) 720 1670 w
10 /LucidaSansUnicode00 f
(requires) 1347 1670 w
(that) 1797 1670 w
10 /LucidaTypewriter f
(start) 2039 1670 w
10 /LucidaSansUnicode00 f
(requests) 2451 1670 w
(include) 2920 1670 w
(a) 3324 1670 w
10 /LucidaTypewriter f
(proto) 3431 1670 w
10 /LucidaSansUnicode00 f
(attribute,) 3843 1670 w
(and) 4344 1670 w
(the) 4576 1670 w
(APOP) 4783 1670 w
(module) 720 1790 w
(requires) 1122 1790 w
(an) 1559 1790 w
(additional) 1714 1790 w
10 /LucidaTypewriter f
(role) 2235 1790 w
10 /LucidaSansUnicode00 f
(attribute,) 2561 1790 w
(but) 3047 1790 w
(the) 3246 1790 w
(other) 3438 1790 w
(attributes) 3732 1790 w
(are) 4237 1790 w
(optional) 4426 1790 w
(and) 4860 1790 w
(only) 720 1910 w
(restrict) 978 1910 w
(the) 1375 1910 w
(key) 1584 1910 w
(space.) 1804 1910 w
(Before) 2198 1910 w
(responding) 2561 1910 w
(to) 3165 1910 w
(the) 3317 1910 w
10 /LucidaTypewriter f
(start) 3526 1910 w
10 /LucidaSansUnicode00 f
(transaction,) 3940 1910 w
(the) 4567 1910 w
(client) 4776 1910 w
10 /LucidaTypewriter f
(factotum) 720 2030 w
10 /LucidaSansUnicode00 f
(looks) 1331 2030 w
(for) 1626 2030 w
(a) 1800 2030 w
(key) 1890 2030 w
(to) 2090 2030 w
(use) 2222 2030 w
(for) 2425 2030 w
(the) 2598 2030 w
(rest) 2787 2030 w
(of) 3006 2030 w
(the) 3138 2030 w
(conversation.) 3327 2030 w
(Because) 4043 2030 w
(of) 4466 2030 w
(the) 4598 2030 w
(argu\255) 4787 2030 w
(ments) 720 2150 w
(in) 1065 2150 w
(the) 1203 2150 w
10 /LucidaTypewriter f
(start) 1405 2150 w
10 /LucidaSansUnicode00 f
(request,) 1812 2150 w
(the) 2257 2150 w
(key) 2459 2150 w
(must) 2672 2150 w
(have) 2962 2150 w
(public) 3234 2150 w
(attributes) 3578 2150 w
10 /LucidaTypewriter f
(proto=apop) 4093 2150 w
10 /LucidaSansUnicode00 f
(and) 4860 2150 w
10 /LucidaTypewriter f
(server=x.y.com) 720 2270 w
10 /LucidaSansUnicode00 f
(;) 1728 2270 w
(as) 1803 2270 w
(mentioned) 1952 2270 w
(earlier,) 2514 2270 w
(the) 2896 2270 w
(APOP) 3094 2270 w
(module) 3394 2270 w
(additionally) 3801 2270 w
(requires) 4408 2270 w
(that) 4849 2270 w
(the) 720 2390 w
(key) 925 2390 w
(have) 1141 2390 w
10 /LucidaTypewriter f
(user) 1416 2390 w
10 /LucidaSansUnicode00 f
(and) 1754 2390 w
10 /LucidaTypewriter f
(!password) 1984 2390 w
10 /LucidaSansUnicode00 f
(attributes.) 2682 2390 w
(Now) 3264 2390 w
(that) 3526 2390 w
(the) 3768 2390 w
(client) 3974 2390 w
(has) 4289 2390 w
(obtained) 4508 2390 w
(a) 4985 2390 w
(response from its) 720 2510 w
10 /LucidaTypewriter f
(factotum) 1606 2510 w
10 /LucidaSansUnicode00 f
(, it echoes that response to the server:) 2182 2510 w
11 /LucidaSans-Italic f
(P) 1008 2680 w
8 /LucidaSans-Italic f
(C) 1085 2702 w
11 /S f
(\256) 1157 2680 w
11 /LucidaSans-Italic f
(P) 1275 2680 w
8 /LucidaSans-Italic f
(S) 1352 2702 w
9 /LucidaTypewriter f
(:) 1405 2680 w
(APOP) 1535 2680 w
(gre) 1860 2680 w
9 /LucidaSans-Italic f
(response) 2120 2680 w
10 /LucidaSansUnicode00 f
(Similarly,) 720 2860 w
(the) 1198 2860 w
(server) 1388 2860 w
(passes) 1720 2860 w
(this) 2082 2860 w
(message) 2296 2860 w
(to) 2755 2860 w
(its) 2889 2860 w
10 /LucidaTypewriter f
(factotum) 3042 2860 w
10 /LucidaSansUnicode00 f
(and) 3654 2860 w
(obtains) 3870 2860 w
(another) 4264 2860 w
(to) 4674 2860 w
(send) 4808 2860 w
(back.) 720 2980 w
11 /LucidaSans-Italic f
(P) 1008 3150 w
8 /LucidaSans-Italic f
(S) 1085 3172 w
11 /S f
(\256) 1147 3150 w
11 /LucidaSans-Italic f
(F) 1265 3150 w
8 /LucidaSans-Italic f
(S) 1337 3172 w
9 /LucidaTypewriter f
(:) 1390 3150 w
(write) 1520 3150 w
(APOP) 1910 3150 w
(gre) 2235 3150 w
9 /LucidaSans-Italic f
(response) 2495 3150 w
11 /LucidaSans-Italic f
(F) 1008 3260 w
8 /LucidaSans-Italic f
(S) 1080 3282 w
11 /S f
(\256) 1142 3260 w
11 /LucidaSans-Italic f
(P) 1260 3260 w
8 /LucidaSans-Italic f
(S) 1337 3282 w
9 /LucidaTypewriter f
(:) 1390 3260 w
(ok) 1520 3260 w
11 /LucidaSans-Italic f
(P) 1008 3370 w
8 /LucidaSans-Italic f
(S) 1085 3392 w
11 /S f
(\256) 1147 3370 w
11 /LucidaSans-Italic f
(F) 1265 3370 w
8 /LucidaSans-Italic f
(S) 1337 3392 w
9 /LucidaTypewriter f
(:) 1390 3370 w
(read) 1520 3370 w
11 /LucidaSans-Italic f
(F) 1008 3480 w
8 /LucidaSans-Italic f
(S) 1080 3502 w
11 /S f
(\256) 1142 3480 w
11 /LucidaSans-Italic f
(P) 1260 3480 w
8 /LucidaSans-Italic f
(S) 1337 3502 w
9 /LucidaTypewriter f
(:) 1390 3480 w
(ok) 1520 3480 w
(+OK) 1715 3480 w
(welcome) 1975 3480 w
11 /LucidaSans-Italic f
(P) 1008 3700 w
8 /LucidaSans-Italic f
(S) 1085 3722 w
11 /S f
(\256) 1147 3700 w
11 /LucidaSans-Italic f
(P) 1265 3700 w
8 /LucidaSans-Italic f
(C) 1342 3722 w
9 /LucidaTypewriter f
(:) 1405 3700 w
(+OK) 1535 3700 w
(welcome) 1795 3700 w
10 /LucidaSansUnicode00 f
(Now) 720 3880 w
(the) 972 3880 w
(authentication) 1167 3880 w
(protocol) 1902 3880 w
(is) 2346 3880 w
(done,) 2466 3880 w
(and) 2781 3880 w
(the) 3002 3880 w
(server) 3198 3880 w
(can) 3536 3880 w
(retrieve) 3745 3880 w
(information) 4154 3880 w
(about) 4762 3880 w
(what the protocol established.) 720 4000 w
11 /LucidaSans-Italic f
(P) 1008 4170 w
8 /LucidaSans-Italic f
(S) 1085 4192 w
11 /S f
(\256) 1147 4170 w
11 /LucidaSans-Italic f
(F) 1265 4170 w
8 /LucidaSans-Italic f
(S) 1337 4192 w
9 /LucidaTypewriter f
(:) 1390 4170 w
(authinfo) 1520 4170 w
11 /LucidaSans-Italic f
(F) 1008 4280 w
8 /LucidaSans-Italic f
(S) 1080 4302 w
11 /S f
(\256) 1142 4280 w
11 /LucidaSans-Italic f
(P) 1260 4280 w
8 /LucidaSans-Italic f
(S) 1337 4302 w
9 /LucidaTypewriter f
(:) 1390 4280 w
(ok) 1520 4280 w
(client=gre) 1715 4280 w
(capability=) 1788 4390 w
9 /LucidaSans-Italic f
(capability) 2503 4390 w
10 /LucidaSansUnicode00 f
(The) 720 4570 w
10 /LucidaTypewriter f
(authinfo) 936 4570 w
10 /LucidaSansUnicode00 f
(data) 1547 4570 w
(is) 1792 4570 w
(a) 1907 4570 w
(list) 1997 4570 w
(of) 2178 4570 w
10 /LucidaSans-Italic f
(attr) 2311 4570 w
10 /LucidaTypewriter f
(=) 2496 4570 w
10 /LucidaSans-Italic f
(value) 2568 4570 w
10 /LucidaSansUnicode00 f
(pairs,) 2862 4570 w
(here) 3168 4570 w
(a) 3418 4570 w
(client) 3508 4570 w
(user) 3807 4570 w
(name) 4053 4570 w
(and) 4355 4570 w
(a) 4571 4570 w
(capabil\255) 4662 4570 w
(ity.) 720 4690 w
(\(Protocols) 951 4690 w
(that) 1479 4690 w
(establish) 1718 4690 w
(shared) 2199 4690 w
(secrets) 2575 4690 w
(or) 2966 4690 w
(provide) 3116 4690 w
(mutual) 3529 4690 w
(authentication) 3915 4690 w
(indicate) 4658 4690 w
(this by adding appropriate) 720 4810 w
10 /LucidaSans-Italic f
(attr) 2040 4810 w
10 /LucidaTypewriter f
(=) 2225 4810 w
10 /LucidaSans-Italic f
(value) 2297 4810 w
10 /LucidaSansUnicode00 f
(pairs.\)) 2588 4810 w
(The capability can be used by the server to) 2956 4810 w
(change) 720 4930 w
(its) 1115 4930 w
(identity) 1279 4930 w
(to) 1691 4930 w
(that) 1835 4930 w
(of) 2072 4930 w
(the) 2216 4930 w
(client,) 2417 4930 w
(as) 2759 4930 w
(described) 2911 4930 w
(earlier.) 3430 4930 w
(Once) 3847 4930 w
(it) 4140 4930 w
(has) 4252 4930 w
(changed) 4466 4930 w
(its) 4923 4930 w
(identity, the server can access and serve the client) 720 5050 w
10 /LucidaSansUnicode20 f
(\031) 3163 5050 w
10 /LucidaSansUnicode00 f
(s mailbox.) 3195 5050 w
(Two) 720 5206 w
(more) 967 5206 w
(files) 1264 5206 w
(provide) 1512 5206 w
(hooks) 1923 5206 w
(for) 2262 5206 w
(a) 2447 5206 w
(graphical) 2548 5206 w
10 /LucidaTypewriter f
(factotum) 3041 5206 w
10 /LucidaSansUnicode00 f
(control) 3663 5206 w
(interface.) 4051 5206 w
(The) 4585 5206 w
(first,) 4813 5206 w
10 /LucidaTypewriter f
(confirm) 720 5326 w
10 /LucidaSansUnicode00 f
(,) 1224 5326 w
(allows) 1296 5326 w
(the) 1638 5326 w
(user) 1833 5326 w
(detailed) 2083 5326 w
(control) 2511 5326 w
(over) 2893 5326 w
(the) 3143 5326 w
(use) 3338 5326 w
(of) 3547 5326 w
(certain) 3684 5326 w
(keys.) 4054 5326 w
(If) 4374 5326 w
(a) 4479 5326 w
(key) 4573 5326 w
(has) 4778 5326 w
(a) 4985 5326 w
10 /LucidaTypewriter f
(confirm=) 720 5446 w
10 /LucidaSansUnicode00 f
(attribute,) 1333 5446 w
(then) 1819 5446 w
(the) 2073 5446 w
(user) 2265 5446 w
(must) 2512 5446 w
(approve) 2792 5446 w
(each) 3220 5446 w
(use) 3481 5446 w
(of) 3687 5446 w
(the) 3822 5446 w
(key.) 4015 5446 w
(A) 4283 5446 w
(separate) 4390 5446 w
(pro\255) 4842 5446 w
(gram) 720 5566 w
(with) 1014 5566 w
(a) 1262 5566 w
(graphical) 1360 5566 w
(interface) 1850 5566 w
(reads) 2317 5566 w
(from) 2626 5566 w
(the) 2901 5566 w
10 /LucidaTypewriter f
(confirm) 3098 5566 w
10 /LucidaSansUnicode00 f
(file) 3644 5566 w
(to) 3837 5566 w
(see) 3977 5566 w
(when) 4182 5566 w
(a) 4481 5566 w
(confirma\255) 4578 5566 w
(tion is necessary.) 720 5686 w
(The read blocks until a key usage needs to be approved, whereupon it) 1624 5686 w
(will return a line of the form) 720 5806 w
9 /LucidaTypewriter f
(confirm) 1008 5976 w
(tag=1) 1528 5976 w
9 /LucidaSans-Italic f
(attributes) 1918 5976 w
10 /LucidaSansUnicode00 f
(requesting) 720 6156 w
(permission) 1279 6156 w
(to) 1855 6156 w
(use) 1994 6156 w
(the) 2204 6156 w
(key) 2400 6156 w
(with) 2607 6156 w
(those) 2853 6156 w
(public) 3161 6156 w
(attributes.) 3499 6156 w
(The) 4072 6156 w
(graphical) 4294 6156 w
(inter\255) 4782 6156 w
(face then prompts the user for approval and writes back) 720 6276 w
9 /LucidaTypewriter f
(tag=1) 1008 6446 w
(answer=yes) 1398 6446 w
10 /LucidaSansUnicode00 f
(\(or) 720 6626 w
10 /LucidaTypewriter f
(answer=no) 887 6626 w
10 /LucidaSansUnicode00 f
(\).) 1535 6626 w
(The) 720 6782 w
(second) 935 6782 w
(file,) 1313 6782 w
10 /LucidaTypewriter f
(needkey) 1530 6782 w
10 /LucidaSansUnicode00 f
(,) 2034 6782 w
(diverts) 2100 6782 w
(key) 2463 6782 w
(requests.) 2663 6782 w
(In) 3178 6782 w
(the) 3304 6782 w
(APOP) 3494 6782 w
(example,) 3786 6782 w
(if) 4266 6782 w
(a) 4367 6782 w
(suitable) 4457 6782 w
(key) 4874 6782 w
(had) 720 6902 w
(not) 947 6902 w
(been) 1154 6902 w
(found) 1438 6902 w
(during) 1770 6902 w
(the) 2136 6902 w
10 /LucidaTypewriter f
(start) 2338 6902 w
10 /LucidaSansUnicode00 f
(transaction,) 2745 6902 w
10 /LucidaTypewriter f
(factotum) 3364 6902 w
10 /LucidaSansUnicode00 f
(would) 3986 6902 w
(have) 4324 6902 w
(indicated) 4595 6902 w
(failure by returning a response indicating what key was needed:) 720 7022 w
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10 pagesetup
10 /LucidaSansUnicode00 f
(\255 10 \255) 2752 480 w
11 /LucidaSans-Italic f
(F) 1008 830 w
8 /LucidaSans-Italic f
(C) 1080 852 w
11 /S f
(\256) 1152 830 w
11 /LucidaSans-Italic f
(P) 1270 830 w
8 /LucidaSans-Italic f
(C) 1347 852 w
9 /LucidaTypewriter f
(:) 1410 830 w
(needkey) 1540 830 w
(proto=apop) 2060 830 w
(server=x.y.com) 1268 940 w
(user?) 2243 940 w
(!password?) 2633 940 w
10 /LucidaSansUnicode00 f
(A) 720 1120 w
(typical) 836 1120 w
(client) 1199 1120 w
(would) 1511 1120 w
(then) 1851 1120 w
(prompt) 2116 1120 w
(the) 2522 1120 w
(user) 2725 1120 w
(for) 2983 1120 w
(the) 3170 1120 w
(desired) 3373 1120 w
(key) 3780 1120 w
(information,) 3994 1120 w
(create) 4641 1120 w
(a) 4985 1120 w
(new) 720 1240 w
(key) 955 1240 w
(via) 1160 1240 w
(the) 1335 1240 w
10 /LucidaTypewriter f
(ctl) 1529 1240 w
10 /LucidaSansUnicode00 f
(file,) 1784 1240 w
(and) 2006 1240 w
(then) 2225 1240 w
(reissue) 2481 1240 w
(the) 2866 1240 w
10 /LucidaTypewriter f
(start) 3060 1240 w
10 /LucidaSansUnicode00 f
(request.) 3459 1240 w
(If) 3928 1240 w
(the) 4033 1240 w
10 /LucidaTypewriter f
(needkey) 4227 1240 w
10 /LucidaSansUnicode00 f
(file) 4770 1240 w
(is) 4960 1240 w
(open,) 720 1360 w
(then) 1046 1360 w
(instead) 1315 1360 w
(of) 1720 1360 w
(failing,) 1870 1360 w
(the) 2257 1360 w
(transaction) 2464 1360 w
(will) 3058 1360 w
(block,) 3275 1360 w
(and) 3622 1360 w
(the) 3855 1360 w
(next) 4063 1360 w
(read) 4332 1360 w
(from) 4600 1360 w
(the) 4885 1360 w
10 /LucidaTypewriter f
(/mnt/factotum/needkey) 720 1480 w
10 /LucidaSansUnicode00 f
(file will return a line of the form) 2264 1480 w
9 /LucidaTypewriter f
(needkey) 1008 1650 w
(tag=1) 1528 1650 w
9 /LucidaSans-Italic f
(attributes) 1918 1650 w
10 /LucidaSansUnicode00 f
(The) 720 1830 w
(graphical) 943 1830 w
(interface) 1433 1830 w
(then) 1900 1830 w
(prompts) 2160 1830 w
(the) 2612 1830 w
(user) 2810 1830 w
(for) 3063 1830 w
(the) 3245 1830 w
(needed) 3443 1830 w
(key) 3842 1830 w
(information,) 4051 1830 w
(creates) 4693 1830 w
(the key via the) 720 1950 w
10 /LucidaTypewriter f
(ctl) 1460 1950 w
10 /LucidaSansUnicode00 f
(file, and writes back) 1708 1950 w
10 /LucidaTypewriter f
(tag=1) 2717 1950 w
10 /LucidaSansUnicode00 f
(to resume the transaction.) 3109 1950 w
(The) 720 2106 w
(remaining) 935 2106 w
(files) 1458 2106 w
(are) 1694 2106 w
(informational) 1880 2106 w
(and) 2565 2106 w
(used) 2779 2106 w
(for) 3045 2106 w
(debugging.) 3218 2106 w
(The) 3837 2106 w
10 /LucidaTypewriter f
(proto) 4052 2106 w
10 /LucidaSansUnicode00 f
(file) 4446 2106 w
(contains) 4632 2106 w
(a) 720 2226 w
(list) 852 2226 w
(of) 1075 2226 w
(supported) 1250 2226 w
(protocols) 1824 2226 w
(\(to) 2356 2226 w
(see) 2563 2226 w
(what) 2802 2226 w
(protocols) 3109 2226 w
(the) 3640 2226 w
(system) 3871 2226 w
(supports,) 4287 2226 w
10 /LucidaTypewriter f
(cat) 4824 2226 w
(/mnt/factotum/proto) 720 2346 w
10 /LucidaSansUnicode00 f
(\),) 2088 2346 w
(and) 2192 2346 w
(the) 2411 2346 w
10 /LucidaTypewriter f
(log) 2605 2346 w
10 /LucidaSansUnicode00 f
(file) 2861 2346 w
(contains) 3052 2346 w
(a) 3500 2346 w
(log) 3595 2346 w
(of) 3787 2346 w
(operations) 3925 2346 w
(and) 4481 2346 w
(debug\255) 4701 2346 w
(ging output enabled by a) 720 2466 w
10 /LucidaTypewriter f
(debug) 1971 2466 w
10 /LucidaSansUnicode00 f
(control message.) 2363 2466 w
(The next few sections explain how) 720 2622 w
10 /LucidaTypewriter f
(factotum) 2432 2622 w
10 /LucidaSansUnicode00 f
(is used by system services.) 3040 2622 w
10 /LucidaSans-Demi f
(3.) 720 2862 w
(Authentication in 9P) 873 2862 w
10 /LucidaSansUnicode00 f
(Plan) 720 3018 w
(9) 962 3018 w
(uses) 1066 3018 w
(a) 1327 3018 w
(remote) 1423 3018 w
(file) 1808 3018 w
(access) 2000 3018 w
(protocol,) 2356 3018 w
(9P) 2833 3018 w
([Pike93],) 2992 3018 w
(to) 3455 3018 w
(connect) 3594 3018 w
(to) 4015 3018 w
(resources) 4154 3018 w
(such) 4666 3018 w
(as) 4934 3018 w
(the) 720 3138 w
(file) 917 3138 w
(server) 1110 3138 w
(and) 1449 3138 w
(remote) 1671 3138 w
(processes.) 2056 3138 w
(The) 2642 3138 w
(original) 2864 3138 w
(design) 3273 3138 w
(for) 3637 3138 w
(9P) 3817 3138 w
(included) 3976 3138 w
(special) 4432 3138 w
(mes\255) 4807 3138 w
(sages) 720 3258 w
(at) 1031 3258 w
(the) 1159 3258 w
(start) 1350 3258 w
(of) 1607 3258 w
(a) 1741 3258 w
(conversation) 1832 3258 w
(to) 2486 3258 w
(authenticate) 2620 3258 w
(the) 3255 3258 w
(user.) 3446 3258 w
(Multiple) 3756 3258 w
(users) 4183 3258 w
(can) 4480 3258 w
(share) 4684 3258 w
(a) 4985 3258 w
(single) 720 3378 w
(connection,) 1046 3378 w
(such) 1647 3378 w
(as) 1910 3378 w
(when) 2053 3378 w
(a) 2347 3378 w
(CPU) 2439 3378 w
(server) 2669 3378 w
(runs) 3002 3378 w
(processes) 3254 3378 w
(for) 3771 3378 w
(many) 3946 3378 w
(users) 4244 3378 w
(connected) 4541 3378 w
(to) 720 3498 w
(a) 854 3498 w
(single) 945 3498 w
(file) 1270 3498 w
(server,) 1457 3498 w
(but) 1822 3498 w
(each) 2021 3498 w
(must) 2282 3498 w
(authenticate) 2562 3498 w
(separately.) 3198 3498 w
(The) 3794 3498 w
(authentication) 4012 3498 w
(proto\255) 4744 3498 w
(col,) 720 3618 w
(similar) 935 3618 w
(to) 1304 3618 w
(that) 1444 3618 w
(of) 1676 3618 w
(Kerberos) 1815 3618 w
([Stei88],) 2290 3618 w
(used) 2731 3618 w
(a) 3004 3618 w
(sequence) 3100 3618 w
(of) 3598 3618 w
(messages) 3737 3618 w
(passed) 4253 3618 w
(between) 4633 3618 w
(client,) 720 3738 w
(file) 1061 3738 w
(server,) 1257 3738 w
(and) 1631 3738 w
(authentication) 1856 3738 w
(server) 2596 3738 w
(to) 2938 3738 w
(verify) 3081 3738 w
(the) 3394 3738 w
(identities) 3595 3738 w
(of) 4090 3738 w
(the) 4234 3738 w
(user,) 4435 3738 w
(calling) 4723 3738 w
(machine,) 720 3858 w
(and) 1196 3858 w
(serving) 1412 3858 w
(machine.) 1801 3858 w
(One) 2309 3858 w
(major) 2541 3858 w
(drawback) 2857 3858 w
(to) 3356 3858 w
(the) 3490 3858 w
(design) 3681 3858 w
(was) 4039 3858 w
(that) 4257 3858 w
(the) 4483 3858 w
(authen\255) 4673 3858 w
(tication) 720 3978 w
(method) 1115 3978 w
(was) 1521 3978 w
(defined) 1738 3978 w
(by) 2138 3978 w
(9P) 2287 3978 w
(itself) 2439 3978 w
(and) 2712 3978 w
(could) 2926 3978 w
(not) 3226 3978 w
(be) 3420 3978 w
(changed.) 3573 3978 w
(Moreover,) 4050 3978 w
(there) 4570 3978 w
(was) 4857 3978 w
(no) 720 4098 w
(mechanism) 893 4098 w
(to) 1495 4098 w
(relegate) 1642 4098 w
(authentication) 2083 4098 w
(to) 2827 4098 w
(an) 2974 4098 w
(external) 3140 4098 w
(\(trusted\)) 3586 4098 w
(agent,) 4048 4098 w
(so) 4401 4098 w
(a) 4562 4098 w
(process) 4666 4098 w
(implementing) 720 4218 w
(9P) 1430 4218 w
(needed,) 1587 4218 w
(besides) 2014 4218 w
(support) 2423 4218 w
(for) 2841 4218 w
(file) 3020 4218 w
(service,) 3211 4218 w
(a) 3619 4218 w
(substantial) 3714 4218 w
(body) 4285 4218 w
(of) 4564 4218 w
(crypto\255) 4702 4218 w
(graphic code to implement a handful of early messages in the protocol.) 720 4338 w
(A) 720 4494 w
(recent) 829 4494 w
(redesign) 1172 4494 w
(of) 1632 4494 w
(9P) 1770 4494 w
(addressed) 1928 4494 w
(a) 2467 4494 w
(number) 2562 4494 w
(of) 2979 4494 w
(file) 3117 4494 w
(service) 3308 4494 w
(issues) 3684 4494 w
(outside) 4024 4494 w
(the) 4423 4494 w
(scope) 4619 4494 w
(of) 4942 4494 w
(this) 720 4614 w
(paper.) 944 4614 w
(On) 1331 4614 w
(issues) 1516 4614 w
(of) 1861 4614 w
(authentication,) 2004 4614 w
(there) 2776 4614 w
(were) 3073 4614 w
(two) 3348 4614 w
(goals:) 3568 4614 w
(first,) 3903 4614 w
(to) 4175 4614 w
(remove) 4317 4614 w
(details) 4720 4614 w
(about) 720 4734 w
(authentication) 1042 4734 w
(from) 1781 4734 w
(the) 2057 4734 w
(protocol) 2256 4734 w
(itself;) 2704 4734 w
(second,) 3019 4734 w
(to) 3439 4734 w
(allow) 3581 4734 w
(an) 3877 4734 w
(external) 4039 4734 w
(program) 4481 4734 w
(to) 4942 4734 w
(execute) 720 4854 w
(the) 1159 4854 w
(authentication) 1373 4854 w
(part) 2127 4854 w
(of) 2382 4854 w
(the) 2539 4854 w
(protocol.) 2753 4854 w
(In) 3280 4854 w
(particular,) 3430 4854 w
(we) 3984 4854 w
(wanted) 4176 4854 w
(a) 4585 4854 w
(way) 4699 4854 w
(to) 4942 4854 w
(quickly incorporate ideas found in other systems such as SFS [Mazi99].) 720 4974 w
(Since) 720 5130 w
(9P) 1008 5130 w
(is) 1162 5130 w
(a) 1278 5130 w
(file) 1369 5130 w
(service) 1556 5130 w
(protocol,) 1929 5130 w
(the) 2402 5130 w
(solution) 2594 5130 w
(involved) 3023 5130 w
(creating) 3464 5130 w
(a) 3894 5130 w
(new) 3986 5130 w
(type) 4218 5130 w
(of) 4463 5130 w
(file) 4598 5130 w
(to) 4786 5130 w
(be) 4921 5130 w
(served:) 720 5250 w
(an) 1104 5250 w
10 /LucidaSans-Italic f
(authentication) 1254 5250 w
(file) 1989 5250 w
10 /LucidaSansUnicode00 f
(.) 2138 5250 w
(When) 2235 5250 w
(a) 2534 5250 w
(new user connects to a 9P service, the connection) 2622 5250 w
(has) 720 5370 w
(the) 921 5370 w
(permissions) 1109 5370 w
(of) 1729 5370 w
10 /LucidaSansUnicode20 f
(\030) 1861 5370 w
10 /LucidaTypewriter f
(none) 1893 5370 w
10 /LucidaSansUnicode20 f
(\031) 2181 5370 w
10 /LucidaSansUnicode00 f
(,) 2213 5370 w
(a) 2279 5370 w
(state) 2368 5370 w
(that) 2638 5370 w
(allows) 2863 5370 w
(no) 3199 5370 w
(general) 3356 5370 w
(file) 3751 5370 w
(access) 3936 5370 w
(but) 4285 5370 w
(permits) 4481 5370 w
(the) 4885 5370 w
(user) 720 5490 w
(to) 967 5490 w
(open) 1102 5490 w
(an) 1381 5490 w
(authentication) 1535 5490 w
(file) 2267 5490 w
(by) 2454 5490 w
(sending) 2605 5490 w
(a) 3026 5490 w
(special) 3117 5490 w
(message,) 3487 5490 w
(generated) 3979 5490 w
(by) 4503 5490 w
(the) 4654 5490 w
(new) 4845 5490 w
10 /LucidaTypewriter f
(fauth) 720 5610 w
10 /LucidaSansUnicode00 f
(system call:) 1112 5610 w
9 /LucidaTypewriter f
(afd) 1008 5780 w
(=) 1268 5780 w
(fauth\(int) 1398 5780 w
(fd,) 2048 5780 w
(char) 2308 5780 w
(*servicename\);) 2633 5780 w
10 /LucidaSansUnicode00 f
(Here) 720 5960 w
10 /LucidaTypewriter f
(fd) 992 5960 w
10 /LucidaSansUnicode00 f
(is) 1181 5960 w
(the) 1306 5960 w
(user) 1506 5960 w
10 /LucidaSansUnicode20 f
(\031) 1716 5960 w
10 /LucidaSansUnicode00 f
(s) 1748 5960 w
(file) 1844 5960 w
(descriptor) 2040 5960 w
(for) 2578 5960 w
(the) 2762 5960 w
(established) 2963 5960 w
(network) 3561 5960 w
(connection) 3999 5960 w
(to) 4577 5960 w
(the) 4721 5960 w
(9P) 4922 5960 w
(server) 720 6080 w
(and) 1051 6080 w
10 /LucidaTypewriter f
(servicename) 1265 6080 w
10 /LucidaSansUnicode00 f
(is) 2091 6080 w
(the) 2205 6080 w
(name) 2394 6080 w
(of) 2694 6080 w
(the) 2826 6080 w
(desired) 3014 6080 w
(service) 3406 6080 w
(offered) 3775 6080 w
(on) 4159 6080 w
(that) 4315 6080 w
(server,) 4539 6080 w
(for) 4901 6080 w
(example) 720 6200 w
(the) 1187 6200 w
(file) 1396 6200 w
(subsystem) 1601 6200 w
(to) 2172 6200 w
(be) 2325 6200 w
(accessed.) 2499 6200 w
(The) 3052 6200 w
(returned) 3288 6200 w
(file) 3761 6200 w
(descriptor,) 3967 6200 w
10 /LucidaTypewriter f
(afd) 4547 6200 w
10 /LucidaSansUnicode00 f
(,) 4763 6200 w
(is) 4850 6200 w
(a) 4985 6200 w
(unique) 720 6320 w
(handle) 1088 6320 w
(representing) 1449 6320 w
(the) 2099 6320 w
(authentication) 2288 6320 w
(file) 3017 6320 w
(created) 3201 6320 w
(for) 3593 6320 w
(this) 3765 6320 w
(connection) 3977 6320 w
(to) 4542 6320 w
(authen\255) 4673 6320 w
(ticate) 720 6440 w
(to) 1021 6440 w
(this) 1155 6440 w
(service;) 1370 6440 w
(it) 1774 6440 w
(is) 1877 6440 w
(analogous) 1994 6440 w
(to) 2529 6440 w
(a) 2664 6440 w
(capability.) 2756 6440 w
(The) 3320 6440 w
(authentication) 3538 6440 w
(file) 4270 6440 w
(represented) 4458 6440 w
(by) 720 6560 w
10 /LucidaTypewriter f
(afd) 868 6560 w
10 /LucidaSansUnicode00 f
(is not otherwise addressable on the server, such as through the file name hierar\255) 1116 6560 w
(chy.) 720 6680 w
(Otherwise,) 989 6680 w
(it) 1548 6680 w
(behaves) 1655 6680 w
(like) 2091 6680 w
(a) 2304 6680 w
(regular) 2400 6680 w
(file;) 2787 6680 w
(most) 3011 6680 w
(important,) 3294 6680 w
(it) 3845 6680 w
(accepts) 3952 6680 w
(standard) 4357 6680 w
(read) 4825 6680 w
(and write operations.) 720 6800 w
(To) 720 6956 w
(prove) 878 6956 w
(its) 1185 6956 w
(identity,) 1336 6956 w
(the) 1767 6956 w
(user) 1956 6956 w
(process) 2200 6956 w
(\(via) 2609 6956 w
10 /LucidaTypewriter f
(factotum) 2813 6956 w
10 /LucidaSansUnicode00 f
(\)) 3389 6956 w
(executes) 3457 6956 w
(the) 3922 6956 w
(authentication) 4112 6956 w
(pro\255) 4842 6956 w
(tocol,) 720 7076 w
(described) 1026 7076 w
(in) 1534 7076 w
(the) 1660 7076 w
(next) 1850 7076 w
(section) 2101 7076 w
(of) 2483 7076 w
(this) 2616 7076 w
(paper,) 2830 7076 w
(over) 3175 7076 w
(the) 3420 7076 w
10 /LucidaTypewriter f
(afd) 3610 7076 w
10 /LucidaSansUnicode00 f
(file) 3861 7076 w
(descriptor) 4047 7076 w
(with) 4574 7076 w
(ordi\255) 4813 7076 w
(nary) 720 7196 w
(reads) 965 7196 w
(and) 1266 7196 w
(writes.) 1481 7196 w
(When) 1871 7196 w
(client) 2172 7196 w
(and) 2471 7196 w
(server) 2686 7196 w
(have) 3018 7196 w
(successfully) 3278 7196 w
(negotiated,) 3896 7196 w
(the) 4482 7196 w
(authen\255) 4673 7196 w
(tication file changes state so it can be used as evidence of authority in) 720 7316 w
10 /LucidaTypewriter f
(mount) 4168 7316 w
10 /LucidaSansUnicode00 f
(.) 4528 7316 w
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10 /LucidaSansUnicode00 f
(\255 11 \255) 2752 480 w
(Once) 720 840 w
(identity) 1015 840 w
(is) 1428 840 w
(established,) 1556 840 w
(the) 2188 840 w
(process) 2391 840 w
(presents) 2813 840 w
(the) 3279 840 w
(\(now) 3483 840 w
(verified\)) 3765 840 w
10 /LucidaTypewriter f
(afd) 4210 840 w
10 /LucidaSansUnicode00 f
(as) 4475 840 w
(proof) 4630 840 w
(of) 4942 840 w
(identity to the) 720 960 w
10 /LucidaTypewriter f
(mount) 1434 960 w
10 /LucidaSansUnicode00 f
(system call:) 1826 960 w
9 /LucidaTypewriter f
(mount\(int) 1008 1130 w
(fd,) 1658 1130 w
(int) 1918 1130 w
(afd,) 2178 1130 w
(char) 2503 1130 w
(*mountpoint,) 2828 1130 w
(int) 1398 1240 w
(flag,) 1658 1240 w
(char) 2048 1240 w
(*servicename\)) 2373 1240 w
10 /LucidaSansUnicode00 f
(If) 720 1420 w
(the) 823 1420 w
10 /LucidaTypewriter f
(mount) 1015 1420 w
10 /LucidaSansUnicode00 f
(succeeds,) 1412 1420 w
(the) 1922 1420 w
(user) 2114 1420 w
(now) 2361 1420 w
(has) 2599 1420 w
(appropriate) 2805 1420 w
(permissions) 3407 1420 w
(for) 4032 1420 w
(the) 4209 1420 w
(file) 4402 1420 w
(hierarchy) 4591 1420 w
(made visible at the mount point.) 720 1540 w
(This) 720 1696 w
(sequence) 965 1696 w
(of) 1462 1696 w
(events) 1600 1696 w
(has) 1954 1696 w
(several) 2163 1696 w
(advantages.) 2544 1696 w
(First,) 3197 1696 w
(the) 3482 1696 w
(actual) 3678 1696 w
(authentication) 4008 1696 w
(proto\255) 4744 1696 w
(col) 720 1816 w
(is) 895 1816 w
(implemented) 1009 1816 w
(using) 1680 1816 w
(regular) 1980 1816 w
(reads) 2360 1816 w
(and) 2660 1816 w
(writes,) 2874 1816 w
(not) 3231 1816 w
(special) 3425 1816 w
(9P) 3793 1816 w
(messages,) 3945 1816 w
(so) 4486 1816 w
(they) 4632 1816 w
(can) 4872 1816 w
(be) 720 1936 w
(processed,) 881 1936 w
(forwarded,) 1448 1936 w
(proxied,) 2016 1936 w
(and) 2464 1936 w
(so) 2686 1936 w
(on) 2840 1936 w
(by) 3005 1936 w
(any) 3162 1936 w
(9P) 3374 1936 w
(agent) 3535 1936 w
(without) 3850 1936 w
(special) 4258 1936 w
(arrange\255) 4635 1936 w
(ment.) 720 2056 w
(Second,) 1065 2056 w
(the) 1477 2056 w
(business) 1665 2056 w
(of) 2123 2056 w
(negotiating) 2254 2056 w
(the) 2839 2056 w
(authentication) 3027 2056 w
(by) 3755 2056 w
(reading) 3903 2056 w
(and writing the) 4304 2056 w
(authentication) 720 2176 w
(file) 1457 2176 w
(can) 1651 2176 w
(be) 1862 2176 w
(delegated) 2024 2176 w
(to) 2544 2176 w
(an) 2685 2176 w
(outside) 2845 2176 w
(agent,) 3247 2176 w
(in) 3594 2176 w
(particular) 3728 2176 w
10 /LucidaTypewriter f
(factotum) 4234 2176 w
10 /LucidaSansUnicode00 f
(;) 4810 2176 w
(the) 4885 2176 w
(programs) 720 2296 w
(that) 1246 2296 w
(implement) 1496 2296 w
(the) 2073 2296 w
(client) 2287 2296 w
(and) 2610 2296 w
(server) 2849 2296 w
(ends) 3205 2296 w
(of) 3496 2296 w
(a) 3653 2296 w
(9P) 3767 2296 w
(conversation) 3944 2296 w
(need) 4621 2296 w
(no) 4917 2296 w
(authentication) 720 2416 w
(or) 1467 2416 w
(cryptographic) 1621 2416 w
(code.) 2341 2416 w
(Third,) 2689 2416 w
(since) 3032 2416 w
(the) 3334 2416 w
(authentication) 3542 2416 w
(protocol) 4290 2416 w
(is) 4747 2416 w
(not) 4880 2416 w
(defined) 720 2536 w
(by) 1146 2536 w
(9P) 1321 2536 w
(itself,) 1499 2536 w
(it) 1830 2536 w
(is) 1956 2536 w
(easy) 2095 2536 w
(to) 2368 2536 w
(change) 2525 2536 w
(and) 2932 2536 w
(can) 3171 2536 w
(even) 3398 2536 w
(be) 3683 2536 w
(negotiated) 3861 2536 w
(dynamically.) 4438 2536 w
(Finally,) 720 2656 w
(since) 1107 2656 w
10 /LucidaTypewriter f
(afd) 1401 2656 w
10 /LucidaSansUnicode00 f
(acts) 1662 2656 w
(like) 1901 2656 w
(a) 2118 2656 w
(capability,) 2218 2656 w
(it) 2758 2656 w
(can) 2870 2656 w
(be) 3084 2656 w
(treated) 3249 2656 w
(like) 3640 2656 w
(one:) 3858 2656 w
(handed) 4115 2656 w
(to) 4522 2656 w
(another) 4666 2656 w
(process) 720 2776 w
(to) 1134 2776 w
(give) 1272 2776 w
(it) 1511 2776 w
(special) 1617 2776 w
(permissions;) 1991 2776 w
(kept) 2650 2776 w
(around) 2904 2776 w
(for) 3287 2776 w
(later) 3465 2776 w
(use) 3722 2776 w
(when) 3930 2776 w
(authentication) 4226 2776 w
(is) 4960 2776 w
(again required; or closed to make sure no other process can use it.) 720 2896 w
(All) 720 3052 w
(these) 894 3052 w
(advantages) 1203 3052 w
(stem) 1798 3052 w
(from) 2082 3052 w
(moving) 2361 3052 w
(the) 2767 3052 w
(authentication) 2969 3052 w
(negotiation) 3711 3052 w
(into) 4309 3052 w
(reads) 4546 3052 w
(and) 4860 3052 w
(writes) 720 3172 w
(on) 1045 3172 w
(a) 1202 3172 w
(separate) 1291 3172 w
(file.) 1739 3172 w
(As) 1988 3172 w
(is) 2141 3172 w
(often) 2254 3172 w
(the) 2540 3172 w
(case) 2728 3172 w
(in) 2974 3172 w
(Plan) 3098 3172 w
(9,) 3332 3172 w
(making) 3460 3172 w
(a) 3852 3172 w
(resource) 3940 3172 w
(\(here) 4392 3172 w
(authen\255) 4673 3172 w
(tication\)) 720 3292 w
(accessible) 1155 3292 w
(with) 1688 3292 w
(a) 1934 3292 w
(file-like) 2030 3292 w
(interface) 2452 3292 w
(reduces) 2917 3292 w
10 /LucidaSans-Italic f
(a) 3338 3292 w
(priori) 3440 3292 w
10 /LucidaSansUnicode00 f
(the) 3753 3292 w
(need) 3949 3292 w
(for) 4227 3292 w
(special) 4407 3292 w
(inter\255) 4782 3292 w
(faces.) 720 3412 w
(Plan 9 shared key protocol) 720 3568 w
(In) 720 3724 w
(addition) 844 3724 w
(to) 1276 3724 w
(the) 1407 3724 w
(various) 1596 3724 w
(standard) 1981 3724 w
(protocols) 2442 3724 w
(supported) 2931 3724 w
(by) 3462 3724 w
10 /LucidaTypewriter f
(factotum) 3611 3724 w
10 /LucidaSansUnicode00 f
(,) 4187 3724 w
(we) 4253 3724 w
(use) 4420 3724 w
(a) 4623 3724 w
(shared) 4712 3724 w
(key) 720 3844 w
(protocol) 922 3844 w
(for) 1362 3844 w
(native) 1536 3844 w
(Plan) 1862 3844 w
(9) 2098 3844 w
(authentication.) 2196 3844 w
(This) 2990 3844 w
(protocol) 3230 3844 w
(provides) 3669 3844 w
(backward) 4120 3844 w
(compati\255) 4618 3844 w
(bility) 720 3964 w
(with) 994 3964 w
(older) 1234 3964 w
(versions) 1519 3964 w
(of) 1957 3964 w
(the) 2090 3964 w
(system.) 2280 3964 w
(One) 2719 3964 w
(reason) 2950 3964 w
(for) 3311 3964 w
(the) 3485 3964 w
(new) 3675 3964 w
(architecture) 3905 3964 w
(is) 4519 3964 w
(to) 4635 3964 w
(let) 4769 3964 w
(us) 4927 3964 w
(replace such protocols in the near future with more cryptographically secure ones.) 720 4084 w
10 /LucidaSans-Italic f
(P9sk1) 720 4240 w
10 /LucidaSansUnicode00 f
(is) 1061 4240 w
(a) 1191 4240 w
(shared) 1296 4240 w
(key) 1674 4240 w
(protocol) 1890 4240 w
(that) 2344 4240 w
(uses) 2585 4240 w
(tickets) 2855 4240 w
(much) 3224 4240 w
(like) 3542 4240 w
(those) 3764 4240 w
(in) 4081 4240 w
(the) 4222 4240 w
(original) 4427 4240 w
(Ker\255) 4845 4240 w
(beros.) 720 4360 w
(The) 1091 4360 w
(difference) 1307 4360 w
(is) 1829 4360 w
(that) 1943 4360 w
(we) 2168 4360 w
10 /LucidaSansUnicode20 f
(\031) 2301 4360 w
10 /LucidaSansUnicode00 f
(ve) 2333 4360 w
(replaced) 2475 4360 w
(the) 2923 4360 w
(expiration) 3112 4360 w
(time) 3640 4360 w
(in) 3889 4360 w
(Kerberos) 4014 4360 w
(tickets) 4482 4360 w
(with) 4835 4360 w
(a random nonce parameter and a counter.) 720 4480 w
(We summarize it here:) 2832 4480 w
11 /LucidaSans-Italic f
(C) 1008 4650 w
11 /S f
(\256) 1092 4650 w
11 /LucidaSans-Italic f
(S) 1210 4650 w
11 /LucidaSansUnicode00 f
(:) 1280 4650 w
11 /LucidaSans-Italic f
(nonce) 1500 4650 w
8 /LucidaSans-Italic f
(C) 1825 4672 w
11 /LucidaSans-Italic f
(S) 1008 4760 w
11 /S f
(\256) 1078 4760 w
11 /LucidaSans-Italic f
(C) 1196 4760 w
11 /LucidaSansUnicode00 f
(:) 1280 4760 w
11 /LucidaSans-Italic f
(nonce) 1500 4760 w
8 /LucidaSans-Italic f
(S) 1825 4782 w
11 /LucidaSansUnicode00 f
(,) 1887 4760 w
11 /LucidaSans-Italic f
(uid) 1931 4760 w
8 /LucidaSans-Italic f
(S) 2111 4782 w
11 /LucidaSansUnicode00 f
(,) 2173 4760 w
11 /LucidaSans-Italic f
(domain) 2217 4760 w
8 /LucidaSans-Italic f
(S) 2629 4782 w
11 /LucidaSans-Italic f
(C) 1008 4980 w
11 /S f
(\256) 1092 4980 w
11 /LucidaSans-Italic f
(A) 1210 4980 w
11 /LucidaSansUnicode00 f
(:) 1295 4980 w
11 /LucidaSans-Italic f
(nonce) 1515 4980 w
8 /LucidaSans-Italic f
(S) 1840 5002 w
11 /LucidaSansUnicode00 f
(,) 1902 4980 w
11 /LucidaSans-Italic f
(uid) 1946 4980 w
8 /LucidaSans-Italic f
(S) 2126 5002 w
11 /LucidaSansUnicode00 f
(,) 2188 4980 w
11 /LucidaSans-Italic f
(domain) 2232 4980 w
8 /LucidaSans-Italic f
(S) 2644 5002 w
11 /LucidaSansUnicode00 f
(,) 2706 4980 w
11 /LucidaSans-Italic f
(uid) 2750 4980 w
8 /LucidaSans-Italic f
(C) 2930 5002 w
11 /LucidaSansUnicode00 f
(,) 3002 4980 w
11 /LucidaSans-Italic f
(factotum) 1593 5090 w
8 /LucidaSans-Italic f
(C) 2087 5112 w
11 /LucidaSans-Italic f
(A) 1008 5200 w
11 /S f
(\256) 1093 5200 w
11 /LucidaSans-Italic f
(C) 1211 5200 w
11 /LucidaSansUnicode00 f
(:) 1295 5200 w
11 /LucidaSans-Italic f
(K) 1515 5200 w
8 /LucidaSans-Italic f
(C) 1598 5222 w
11 /LucidaSansUnicode00 f
({) 1670 5200 w
11 /LucidaSans-Italic f
(nonce) 1715 5200 w
8 /LucidaSans-Italic f
(S) 2040 5222 w
11 /LucidaSansUnicode00 f
(,) 2102 5200 w
11 /LucidaSans-Italic f
(uid) 2146 5200 w
8 /LucidaSans-Italic f
(C) 2326 5222 w
11 /LucidaSansUnicode00 f
(,) 2398 5200 w
11 /LucidaSans-Italic f
(uid) 2442 5200 w
8 /LucidaSans-Italic f
(S) 2622 5222 w
8 /LucidaSansUnicode00 f
(,) 2672 5222 w
11 /LucidaSans-Italic f
(K) 2716 5200 w
8 /LucidaSans-Italic f
(n) 2799 5222 w
11 /LucidaSansUnicode00 f
(}) 2867 5200 w
(,) 2912 5200 w
11 /LucidaSans-Italic f
(K) 1593 5310 w
8 /LucidaSans-Italic f
(S) 1676 5332 w
11 /LucidaSansUnicode00 f
({) 1738 5310 w
11 /LucidaSans-Italic f
(nonce) 1783 5310 w
8 /LucidaSans-Italic f
(S) 2108 5332 w
11 /LucidaSansUnicode00 f
(,) 2170 5310 w
11 /LucidaSans-Italic f
(uid) 2214 5310 w
8 /LucidaSans-Italic f
(C) 2394 5332 w
11 /LucidaSansUnicode00 f
(,) 2466 5310 w
11 /LucidaSans-Italic f
(uid) 2510 5310 w
8 /LucidaSans-Italic f
(S) 2690 5332 w
8 /LucidaSansUnicode00 f
(,) 2740 5332 w
11 /LucidaSans-Italic f
(K) 2784 5310 w
8 /LucidaSans-Italic f
(n) 2867 5332 w
11 /LucidaSansUnicode00 f
(}) 2935 5310 w
11 /LucidaSans-Italic f
(C) 1008 5530 w
11 /S f
(\256) 1092 5530 w
11 /LucidaSans-Italic f
(S) 1210 5530 w
11 /LucidaSansUnicode00 f
(:) 1280 5530 w
11 /LucidaSans-Italic f
(K) 1500 5530 w
8 /LucidaSans-Italic f
(S) 1583 5552 w
11 /LucidaSansUnicode00 f
({) 1645 5530 w
11 /LucidaSans-Italic f
(nonce) 1690 5530 w
8 /LucidaSans-Italic f
(S) 2015 5552 w
11 /LucidaSansUnicode00 f
(,) 2077 5530 w
11 /LucidaSans-Italic f
(uid) 2121 5530 w
8 /LucidaSans-Italic f
(C) 2301 5552 w
11 /LucidaSansUnicode00 f
(,) 2373 5530 w
11 /LucidaSans-Italic f
(uid) 2417 5530 w
8 /LucidaSans-Italic f
(S) 2597 5552 w
11 /LucidaSansUnicode00 f
(,) 2659 5530 w
11 /LucidaSans-Italic f
(K) 2703 5530 w
8 /LucidaSans-Italic f
(n) 2786 5552 w
11 /LucidaSansUnicode00 f
(}) 2854 5530 w
(,) 2899 5530 w
11 /LucidaSans-Italic f
(K) 1593 5640 w
8 /LucidaSans-Italic f
(n) 1676 5662 w
11 /LucidaSansUnicode00 f
({) 1744 5640 w
11 /LucidaSans-Italic f
(nonce) 1789 5640 w
8 /LucidaSans-Italic f
(S) 2114 5662 w
11 /LucidaSansUnicode00 f
(,) 2176 5640 w
11 /LucidaSans-Italic f
(counter) 2220 5640 w
11 /LucidaSansUnicode00 f
(}) 2636 5640 w
11 /LucidaSans-Italic f
(S) 1008 5750 w
11 /S f
(\256) 1078 5750 w
11 /LucidaSans-Italic f
(C) 1196 5750 w
11 /LucidaSansUnicode00 f
(:) 1280 5750 w
11 /LucidaSans-Italic f
(K) 1500 5750 w
8 /LucidaSans-Italic f
(n) 1583 5772 w
11 /LucidaSansUnicode00 f
({) 1651 5750 w
11 /LucidaSans-Italic f
(nonce) 1696 5750 w
8 /LucidaSans-Italic f
(C) 2021 5772 w
11 /LucidaSansUnicode00 f
(,) 2093 5750 w
11 /LucidaSans-Italic f
(counter) 2137 5750 w
11 /LucidaSansUnicode00 f
(}) 2553 5750 w
10 /LucidaSansUnicode00 f
(\(Here) 720 5930 w
11 /LucidaSans-Italic f
(K) 1029 5930 w
11 /LucidaSansUnicode00 f
({) 1108 5930 w
11 /LucidaSans-Italic f
(x) 1153 5930 w
11 /LucidaSansUnicode00 f
(}) 1221 5930 w
10 /LucidaSansUnicode00 f
(indicates) 1306 5930 w
11 /LucidaSans-Italic f
(x) 1788 5930 w
10 /LucidaSansUnicode00 f
(encrypted) 1897 5930 w
(with) 2428 5930 w
(DES) 2683 5930 w
(key) 2916 5930 w
11 /LucidaSans-Italic f
(K) 3132 5930 w
10 /LucidaSansUnicode00 f
(.\)) 3202 5930 w
(The) 3349 5930 w
(first) 3580 5930 w
(two) 3825 5930 w
(messages) 4050 5930 w
(exchange) 4575 5930 w
(nonces) 720 6050 w
(and) 1121 6050 w
(server) 1359 6050 w
(identification.) 1714 6050 w
(After) 2473 6050 w
(this) 2771 6050 w
(initial) 3008 6050 w
(exchange,) 3336 6050 w
(the) 3890 6050 w
(client) 4102 6050 w
(contacts) 4423 6050 w
(the) 4885 6050 w
(authentication) 720 6170 w
(server) 1450 6170 w
(to) 1782 6170 w
(obtain) 1916 6170 w
(a) 2259 6170 w
(pair) 2350 6170 w
(of) 2574 6170 w
(encrypted) 2708 6170 w
(tickets,) 3225 6170 w
(one) 3612 6170 w
(encrypted) 3827 6170 w
(with) 4344 6170 w
(the) 4585 6170 w
(client) 4776 6170 w
(key) 720 6290 w
(and) 928 6290 w
(one) 1150 6290 w
(with) 1371 6290 w
(the) 1618 6290 w
(server) 1815 6290 w
(key.) 2154 6290 w
(The) 2426 6290 w
(client) 2649 6290 w
(relays) 2954 6290 w
(the) 3279 6290 w
(server) 3475 6290 w
(ticket) 3813 6290 w
(to) 4122 6290 w
(the) 4261 6290 w
(server.) 4457 6290 w
(The) 4859 6290 w
(server) 720 6410 w
(believes) 1058 6410 w
(that) 1491 6410 w
(the) 1723 6410 w
(ticket) 1919 6410 w
(is) 2228 6410 w
(new) 2349 6410 w
(because) 2585 6410 w
(it) 3020 6410 w
(contains) 3127 6410 w
11 /LucidaSans-Italic f
(nonce) 3579 6410 w
8 /LucidaSans-Italic f
(S) 3904 6432 w
10 /LucidaSansUnicode00 f
(and) 3998 6410 w
(that) 4220 6410 w
(the) 4453 6410 w
(ticket) 4650 6410 w
(is) 4960 6410 w
(from) 720 6530 w
(the) 985 6530 w
(authentication server because it is encrypted in the server key) 1173 6530 w
11 /LucidaSans-Italic f
(K) 4215 6530 w
8 /LucidaSans-Italic f
(S) 4298 6552 w
10 /LucidaSansUnicode00 f
(.) 4351 6530 w
(The ticket is) 4447 6530 w
(basically) 720 6650 w
(a) 1181 6650 w
(statement) 1283 6650 w
(from) 1814 6650 w
(the) 2094 6650 w
(authentication) 2297 6650 w
(server) 3040 6650 w
(that) 3385 6650 w
(now) 3624 6650 w
11 /LucidaSans-Italic f
(uid) 3872 6650 w
8 /LucidaSans-Italic f
(C) 4052 6672 w
10 /LucidaSansUnicode00 f
(and) 4163 6650 w
11 /LucidaSans-Italic f
(uid) 4391 6650 w
8 /LucidaSans-Italic f
(S) 4571 6672 w
10 /LucidaSansUnicode00 f
(share) 4672 6650 w
(a) 4985 6650 w
(secret) 720 6770 w
11 /LucidaSans-Italic f
(K) 1050 6770 w
8 /LucidaSans-Italic f
(n) 1133 6792 w
10 /LucidaSansUnicode00 f
(.) 1192 6770 w
(The) 1294 6770 w
(authenticator) 1513 6770 w
11 /LucidaSans-Italic f
(K) 2196 6770 w
8 /LucidaSans-Italic f
(n) 2279 6792 w
11 /LucidaSansUnicode00 f
({) 2347 6770 w
11 /LucidaSans-Italic f
(nonce) 2392 6770 w
8 /LucidaSans-Italic f
(S) 2717 6792 w
11 /LucidaSansUnicode00 f
(,) 2779 6770 w
11 /LucidaSans-Italic f
(counter) 2823 6770 w
11 /LucidaSansUnicode00 f
(}) 3239 6770 w
10 /LucidaSansUnicode00 f
(convinces) 3313 6770 w
(the) 3826 6770 w
(server) 4019 6770 w
(that) 4354 6770 w
(the) 4583 6770 w
(client) 4776 6770 w
(knows) 720 6890 w
11 /LucidaSans-Italic f
(K) 1076 6890 w
8 /LucidaSans-Italic f
(n) 1159 6912 w
10 /LucidaSansUnicode00 f
(and) 1265 6890 w
(thus) 1492 6890 w
(must) 1751 6890 w
(be) 2042 6890 w
11 /LucidaSans-Italic f
(uid) 2209 6890 w
8 /LucidaSans-Italic f
(C) 2389 6912 w
10 /LucidaSansUnicode00 f
(.) 2452 6890 w
(Similarly,) 2564 6890 w
(the) 3055 6890 w
(authenticator) 3258 6890 w
11 /LucidaSans-Italic f
(K) 3951 6890 w
8 /LucidaSans-Italic f
(n) 4034 6912 w
11 /LucidaSansUnicode00 f
({) 4102 6890 w
11 /LucidaSans-Italic f
(nonce) 4147 6890 w
8 /LucidaSans-Italic f
(C) 4472 6912 w
11 /LucidaSansUnicode00 f
(,) 4544 6890 w
11 /LucidaSans-Italic f
(counter) 4588 6890 w
11 /LucidaSansUnicode00 f
(}) 5004 6890 w
10 /LucidaSansUnicode00 f
(convinces) 720 7010 w
(the) 1239 7010 w
(client) 1438 7010 w
(that) 1746 7010 w
(the) 1981 7010 w
(server) 2179 7010 w
(knows) 2519 7010 w
11 /LucidaSans-Italic f
(K) 2871 7010 w
8 /LucidaSans-Italic f
(n) 2954 7032 w
10 /LucidaSansUnicode00 f
(and) 3056 7010 w
(thus) 3279 7010 w
(must) 3534 7010 w
(be) 3820 7010 w
11 /LucidaSans-Italic f
(uid) 3982 7010 w
8 /LucidaSans-Italic f
(S) 4162 7032 w
10 /LucidaSansUnicode00 f
(.) 4215 7010 w
(Tickets) 4322 7010 w
(can) 4710 7010 w
(be) 4921 7010 w
(reused,) 720 7130 w
(without) 1117 7130 w
(contacting) 1518 7130 w
(the) 2061 7130 w
(authentication) 2252 7130 w
(server) 2983 7130 w
(again,) 3317 7130 w
(by) 3649 7130 w
(incrementing) 3801 7130 w
(the) 4478 7130 w
(counter) 4670 7130 w
(before each authenticator is generated.) 720 7250 w
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12 pagesetup
10 /LucidaSansUnicode00 f
(\255 12 \255) 2752 480 w
(In) 720 840 w
(the) 859 840 w
(future) 1062 840 w
(we) 1405 840 w
(hope) 1586 840 w
(to) 1876 840 w
(introduce) 2022 840 w
(a) 2532 840 w
(public) 2635 840 w
(key) 2980 840 w
(version) 3194 840 w
(of) 3594 840 w
(p9sk1,) 3740 840 w
(which) 4118 840 w
(would) 4448 840 w
(allow) 4789 840 w
(authentication) 720 960 w
(even) 1455 960 w
(when) 1721 960 w
(the) 2017 960 w
(authentication) 2211 960 w
(server) 2945 960 w
(is) 3281 960 w
(not) 3400 960 w
(available.) 3599 960 w
(The) 4125 960 w
(authentication) 4345 960 w
(server) 720 1080 w
(Each) 720 1236 w
(Plan) 975 1236 w
(9) 1209 1236 w
(security) 1305 1236 w
(domain) 1717 1236 w
(has) 2113 1236 w
(an) 2314 1236 w
(authentication) 2464 1236 w
(server) 3192 1236 w
(\(AS\)) 3523 1236 w
(that) 3746 1236 w
(all) 3971 1236 w
(users) 4118 1236 w
(trust) 4413 1236 w
(to) 4675 1236 w
(keep) 4807 1236 w
(the) 720 1356 w
(complete) 915 1356 w
(set) 1401 1356 w
(of) 1585 1356 w
(shared) 1723 1356 w
(keys.) 2091 1356 w
(It) 2412 1356 w
(also) 2518 1356 w
(offers) 2753 1356 w
(services) 3075 1356 w
(for) 3501 1356 w
(users) 3679 1356 w
(and) 3979 1356 w
(administrators) 4198 1356 w
(to) 4942 1356 w
(manage) 720 1476 w
(the) 1148 1476 w
(keys,) 1348 1476 w
(create) 1642 1476 w
(and) 1983 1476 w
(disable) 2208 1476 w
(accounts,) 2599 1476 w
(and) 3106 1476 w
(so) 3331 1476 w
(on.) 3488 1476 w
(It) 3720 1476 w
(typically) 3831 1476 w
(runs) 4273 1476 w
(on) 4534 1476 w
(a) 4702 1476 w
(stan\255) 4802 1476 w
(dalone) 720 1596 w
(machine) 1094 1596 w
(with) 1550 1596 w
(few) 1803 1596 w
(other) 2021 1596 w
(services.) 2326 1596 w
(The) 2824 1596 w
(AS) 3052 1596 w
(comprises) 3222 1596 w
(two) 3765 1596 w
(services,) 3987 1596 w
10 /LucidaTypewriter f
(keyfs) 4453 1596 w
10 /LucidaSansUnicode00 f
(and) 4860 1596 w
10 /LucidaTypewriter f
(authsrv) 720 1716 w
10 /LucidaSansUnicode00 f
(.) 1224 1716 w
10 /LucidaTypewriter f
(Keyfs) 720 1872 w
10 /LucidaSansUnicode00 f
(is) 1147 1872 w
(a) 1294 1872 w
(user-level) 1416 1872 w
(file) 1973 1872 w
(system) 2191 1872 w
(that) 2598 1872 w
(manages) 2857 1872 w
(an) 3359 1872 w
(encrypted) 3544 1872 w
(data) 4093 1872 w
(base) 4371 1872 w
(of) 4664 1872 w
(user) 4830 1872 w
(accounts.) 720 1992 w
(Each) 1253 1992 w
(account) 1513 1992 w
(is) 1930 1992 w
(represented) 2048 1992 w
(by) 2668 1992 w
(a) 2821 1992 w
(directory) 2914 1992 w
(containing) 3383 1992 w
(the) 3931 1992 w
(files) 4124 1992 w
10 /LucidaTypewriter f
(key) 4364 1992 w
10 /LucidaSansUnicode00 f
(,) 4580 1992 w
(contain\255) 4650 1992 w
(ing) 720 2112 w
(the) 927 2112 w
(Plan) 1136 2112 w
(9) 1391 2112 w
(key) 1508 2112 w
(for) 1728 2112 w
(p9sk1;) 1921 2112 w
10 /LucidaTypewriter f
(secret) 2306 2112 w
10 /LucidaSansUnicode00 f
(for) 2793 2112 w
(the) 2987 2112 w
(challenge/response) 3197 2112 w
(protocols) 4208 2112 w
(\(APOP,) 4718 2112 w
(VNC,) 720 2232 w
(CHAP,) 998 2232 w
(MSCHAP,) 1335 2232 w
(CRAM\);) 1812 2232 w
10 /LucidaTypewriter f
(log) 2201 2232 w
10 /LucidaSansUnicode00 f
(for) 2454 2232 w
(authentication) 2630 2232 w
(outcomes;) 3362 2232 w
10 /LucidaTypewriter f
(expire) 3903 2232 w
10 /LucidaSansUnicode00 f
(for) 4372 2232 w
(an) 4548 2232 w
(expira\255) 4702 2232 w
(tion) 720 2352 w
(time;) 963 2352 w
(and) 1264 2352 w
10 /LucidaTypewriter f
(status) 1499 2352 w
10 /LucidaSansUnicode00 f
(.) 1931 2352 w
(If) 2050 2352 w
(the) 2171 2352 w
(expiration) 2381 2352 w
(time) 2930 2352 w
(passes,) 3200 2352 w
(if) 3614 2352 w
(the) 3735 2352 w
(number) 3945 2352 w
(of) 4377 2352 w
(successive) 4530 2352 w
(failed) 720 2472 w
(authentications) 1043 2472 w
(exceeds) 1843 2472 w
(50,) 2291 2472 w
(or) 2502 2472 w
(if) 2657 2472 w
10 /LucidaTypewriter f
(disabled) 2776 2472 w
10 /LucidaSansUnicode00 f
(is) 3405 2472 w
(written) 3538 2472 w
(to) 3930 2472 w
(the) 4081 2472 w
(status) 4289 2472 w
(file,) 4635 2472 w
(any) 4871 2472 w
(attempt to access the) 720 2592 w
10 /LucidaTypewriter f
(key) 1794 2592 w
10 /LucidaSansUnicode00 f
(or) 2042 2592 w
10 /LucidaTypewriter f
(secret) 2176 2592 w
10 /LucidaSansUnicode00 f
(files will fail.) 2640 2592 w
10 /LucidaTypewriter f
(Authsrv) 720 2748 w
10 /LucidaSansUnicode00 f
(is) 1257 2748 w
(a) 1370 2748 w
(network) 1458 2748 w
(service) 1883 2748 w
(that) 2252 2748 w
(brokers) 2476 2748 w
(shared) 2881 2748 w
(key) 3243 2748 w
(authentications) 3443 2748 w
(for) 4223 2748 w
(the) 4396 2748 w
(protocols) 4585 2748 w
(p9sk1,) 720 2868 w
(APOP,) 1084 2868 w
(VNC,) 1407 2868 w
(CHAP,) 1681 2868 w
(MSCHAP,) 2014 2868 w
(and) 2487 2868 w
(CRAM.) 2701 2868 w
(Remote) 3085 2868 w
(users) 3484 2868 w
(can) 3778 2868 w
(also) 3979 2868 w
(call) 4208 2868 w
10 /LucidaTypewriter f
(authsrv) 4405 2868 w
10 /LucidaSansUnicode00 f
(to) 4942 2868 w
(change their passwords.) 720 2988 w
(The) 720 3144 w
(p9sk1) 935 3144 w
(protocol) 1267 3144 w
(was) 1705 3144 w
(described) 1922 3144 w
(in) 2429 3144 w
(the) 2554 3144 w
(previous) 2743 3144 w
(section.) 3192 3144 w
(The) 3637 3144 w
(challenge/response) 3852 3144 w
(pro\255) 4842 3144 w
(tocols differ in detail but all follow the general structure:) 720 3264 w
11 /LucidaSans-Italic f
(C) 1008 3434 w
11 /S f
(\256) 1092 3434 w
11 /LucidaSans-Italic f
(S) 1210 3434 w
11 /LucidaSansUnicode00 f
(:) 1280 3434 w
11 /LucidaSans-Italic f
(uid) 1500 3434 w
8 /LucidaSans-Italic f
(C) 1680 3456 w
11 /LucidaSans-Italic f
(S) 1008 3544 w
11 /S f
(\256) 1078 3544 w
11 /LucidaSans-Italic f
(A) 1196 3544 w
11 /LucidaSansUnicode00 f
(:) 1281 3544 w
11 /LucidaSans-Italic f
(nonce) 1501 3544 w
8 /LucidaSans-Italic f
(S) 1826 3566 w
11 /LucidaSansUnicode00 f
(,) 1888 3544 w
11 /LucidaSans-Italic f
(uid) 1932 3544 w
8 /LucidaSans-Italic f
(S) 2112 3566 w
11 /LucidaSansUnicode00 f
(,) 2174 3544 w
11 /LucidaSans-Italic f
(domain) 2218 3544 w
8 /LucidaSans-Italic f
(S) 2630 3566 w
11 /LucidaSansUnicode00 f
(,) 2692 3544 w
11 /LucidaSans-Italic f
(uid) 2736 3544 w
8 /LucidaSans-Italic f
(C) 2916 3566 w
11 /LucidaSansUnicode00 f
(,) 2988 3544 w
11 /LucidaSans-Italic f
(factotum) 1593 3654 w
8 /LucidaSans-Italic f
(S) 2087 3676 w
11 /LucidaSans-Italic f
(A) 1008 3764 w
11 /S f
(\256) 1093 3764 w
11 /LucidaSans-Italic f
(S) 1211 3764 w
11 /LucidaSansUnicode00 f
(:) 1281 3764 w
11 /LucidaSans-Italic f
(challenge) 1501 3764 w
(S) 1008 3874 w
11 /S f
(\256) 1078 3874 w
11 /LucidaSans-Italic f
(C) 1196 3874 w
11 /LucidaSansUnicode00 f
(:) 1280 3874 w
11 /LucidaSans-Italic f
(challenge) 1500 3874 w
(C) 1008 3984 w
11 /S f
(\256) 1092 3984 w
11 /LucidaSans-Italic f
(S) 1210 3984 w
11 /LucidaSansUnicode00 f
(:) 1280 3984 w
11 /LucidaSans-Italic f
(response) 1500 3984 w
(S) 1008 4094 w
11 /S f
(\256) 1078 4094 w
11 /LucidaSans-Italic f
(A) 1196 4094 w
11 /LucidaSansUnicode00 f
(:) 1281 4094 w
11 /LucidaSans-Italic f
(response) 1501 4094 w
(A) 1008 4204 w
11 /S f
(\256) 1093 4204 w
11 /LucidaSans-Italic f
(S) 1211 4204 w
11 /LucidaSansUnicode00 f
(:) 1281 4204 w
11 /LucidaSans-Italic f
(K) 1501 4204 w
8 /LucidaSans-Italic f
(C) 1584 4226 w
11 /LucidaSansUnicode00 f
({) 1656 4204 w
11 /LucidaSans-Italic f
(nonce) 1701 4204 w
8 /LucidaSans-Italic f
(S) 2026 4226 w
11 /LucidaSansUnicode00 f
(,) 2088 4204 w
11 /LucidaSans-Italic f
(uid) 2132 4204 w
8 /LucidaSans-Italic f
(C) 2312 4226 w
11 /LucidaSansUnicode00 f
(,) 2384 4204 w
11 /LucidaSans-Italic f
(uid) 2428 4204 w
8 /LucidaSans-Italic f
(S) 2608 4226 w
8 /LucidaSansUnicode00 f
(,) 2658 4226 w
11 /LucidaSans-Italic f
(K) 2702 4204 w
8 /LucidaSans-Italic f
(n) 2785 4226 w
11 /LucidaSansUnicode00 f
(}) 2853 4204 w
(,) 2898 4204 w
11 /LucidaSans-Italic f
(K) 1593 4314 w
8 /LucidaSans-Italic f
(n) 1676 4336 w
11 /LucidaSansUnicode00 f
({) 1744 4314 w
11 /LucidaSans-Italic f
(nonce) 1789 4314 w
8 /LucidaSans-Italic f
(C) 2114 4336 w
11 /LucidaSansUnicode00 f
(}) 2186 4314 w
10 /LucidaSansUnicode00 f
(The password protocol is:) 720 4494 w
11 /LucidaSans-Italic f
(C) 1008 4664 w
11 /S f
(\256) 1092 4664 w
11 /LucidaSans-Italic f
(A) 1210 4664 w
11 /LucidaSansUnicode00 f
(:) 1295 4664 w
11 /LucidaSans-Italic f
(uid) 1515 4664 w
8 /LucidaSans-Italic f
(C) 1695 4686 w
11 /LucidaSans-Italic f
(A) 1008 4774 w
11 /S f
(\256) 1093 4774 w
11 /LucidaSans-Italic f
(C) 1211 4774 w
11 /LucidaSansUnicode00 f
(:) 1295 4774 w
11 /LucidaSans-Italic f
(K) 1515 4774 w
8 /LucidaSans-Italic f
(c) 1598 4796 w
11 /LucidaSansUnicode00 f
({) 1656 4774 w
11 /LucidaSans-Italic f
(K) 1701 4774 w
8 /LucidaSans-Italic f
(n) 1784 4796 w
11 /LucidaSansUnicode00 f
(}) 1852 4774 w
11 /LucidaSans-Italic f
(C) 1008 4884 w
11 /S f
(\256) 1092 4884 w
11 /LucidaSans-Italic f
(A) 1210 4884 w
11 /LucidaSansUnicode00 f
(:) 1295 4884 w
11 /LucidaSans-Italic f
(K) 1515 4884 w
8 /LucidaSans-Italic f
(n) 1598 4906 w
11 /LucidaSansUnicode00 f
({) 1666 4884 w
11 /LucidaSans-Italic f
(password) 1711 4884 w
8 /LucidaSans-Italic f
(old) 2235 4906 w
11 /LucidaSansUnicode00 f
(,) 2371 4884 w
11 /LucidaSans-Italic f
(password) 2415 4884 w
8 /LucidaSans-Italic f
(new) 2939 4906 w
11 /LucidaSansUnicode00 f
(}) 3111 4884 w
11 /LucidaSans-Italic f
(A) 1008 4994 w
11 /S f
(\256) 1093 4994 w
11 /LucidaSans-Italic f
(C) 1211 4994 w
11 /LucidaSansUnicode00 f
(:) 1295 4994 w
11 /LucidaSans-Italic f
(OK) 1515 4994 w
10 /LucidaSansUnicode00 f
(To) 720 5174 w
(avoid) 883 5174 w
(replay) 1182 5174 w
(attacks,) 1517 5174 w
(the) 1932 5174 w
(pre-encryption) 2126 5174 w
(clear) 2897 5174 w
(text) 3168 5174 w
(for) 3399 5174 w
(each) 3578 5174 w
(of) 3842 5174 w
(the) 3980 5174 w
(protocols) 4175 5174 w
(\(as) 4670 5174 w
(well) 4849 5174 w
(as) 720 5294 w
(for) 867 5294 w
(p9sk1\)) 1047 5294 w
(includes) 1418 5294 w
(a) 1861 5294 w
(tag) 1956 5294 w
(indicating) 2150 5294 w
(the) 2669 5294 w
(encryption) 2864 5294 w
10 /LucidaSansUnicode20 f
(\031) 3378 5294 w
10 /LucidaSansUnicode00 f
(s) 3410 5294 w
(role) 3501 5294 w
(in) 3728 5294 w
(the) 3859 5294 w
(protocol.) 4054 5294 w
(We) 4562 5294 w
(elided) 4744 5294 w
(them in these outlines.) 720 5414 w
(Protocol negotiation) 1900 5414 w
(Rather) 720 5570 w
(than) 1070 5570 w
(require) 1322 5570 w
(particular) 1706 5570 w
(protocols) 2206 5570 w
(for) 2698 5570 w
(particular) 2874 5570 w
(services,) 3374 5570 w
(we) 3830 5570 w
(implemented) 4000 5570 w
(a) 4674 5570 w
(nego\255) 4766 5570 w
(tiation) 720 5690 w
(metaprotocol,) 1079 5690 w
10 /LucidaSans-Italic f
(p9any) 1805 5690 w
10 /LucidaSansUnicode00 f
(,) 2107 5690 w
(which) 2188 5690 w
(chooses) 2517 5690 w
(the) 2958 5690 w
(actual) 3161 5690 w
(authentication) 3498 5690 w
(protocol) 4241 5690 w
(to) 4693 5690 w
(use.) 4839 5690 w
(P9any is used now by all native services on Plan 9.) 720 5810 w
(The metaprotocol is simple.) 720 5966 w
(The callee sends a null-terminated string of the form:) 2139 5966 w
9 /LucidaTypewriter f
(v) 1008 6136 w
8 /LucidaSans-Italic f
(n) 1086 6158 w
11 /LucidaSans-Italic f
(proto) 1210 6136 w
8 /LucidaSansUnicode00 f
(1) 1511 6158 w
9 /LucidaTypewriter f
(@) 1570 6136 w
11 /LucidaSans-Italic f
(domain) 1635 6136 w
8 /LucidaSansUnicode00 f
(1) 2047 6158 w
11 /LucidaSans-Italic f
(proto) 2171 6136 w
8 /LucidaSansUnicode00 f
(2) 2472 6158 w
9 /LucidaTypewriter f
(@) 2531 6136 w
11 /LucidaSans-Italic f
(domain) 2596 6136 w
8 /LucidaSansUnicode00 f
(2) 3008 6158 w
9 /LucidaTypewriter f
(...) 3132 6136 w
10 /LucidaSansUnicode00 f
(where) 720 6316 w
10 /LucidaSans-Italic f
(n) 1056 6316 w
10 /LucidaSansUnicode00 f
(is) 1162 6316 w
(a) 1286 6316 w
(decimal) 1385 6316 w
(version) 1805 6316 w
(number,) 2201 6316 w
11 /LucidaSans-Italic f
(proto) 2654 6316 w
8 /LucidaSans-Italic f
(k) 2955 6338 w
10 /LucidaSansUnicode00 f
(is) 3054 6316 w
(the) 3178 6316 w
(name) 3377 6316 w
(of) 3687 6316 w
(a) 3829 6316 w
(protocol) 3928 6316 w
(for) 4376 6316 w
(which) 4559 6316 w
(the) 4885 6316 w
10 /LucidaTypewriter f
(factotum) 720 6436 w
10 /LucidaSansUnicode00 f
(has) 1346 6436 w
(a) 1564 6436 w
(key,) 1668 6436 w
(and) 1915 6436 w
11 /LucidaSans-Italic f
(domain) 2144 6436 w
8 /LucidaSans-Italic f
(k) 2556 6458 w
10 /LucidaSansUnicode00 f
(is) 2660 6436 w
(the) 2789 6436 w
(name) 2993 6436 w
(of) 3308 6436 w
(the) 3455 6436 w
(domain) 3659 6436 w
(in) 4071 6436 w
(which) 4211 6436 w
(the) 4541 6436 w
(key) 4745 6436 w
(is) 4960 6436 w
(valid.) 720 6556 w
(The caller then responds) 1044 6556 w
9 /LucidaSans-Italic f
(proto) 1008 6726 w
9 /LucidaTypewriter f
(@) 1242 6726 w
9 /LucidaSans-Italic f
(domain) 1307 6726 w
10 /LucidaSansUnicode00 f
(indicating its choice.) 720 6906 w
(Finally the callee responds) 1786 6906 w
9 /LucidaTypewriter f
(OK) 1008 7076 w
10 /LucidaSansUnicode00 f
(Any) 720 7256 w
(other) 947 7256 w
(string) 1248 7256 w
(indicates) 1574 7256 w
(failure.) 2051 7256 w
(At) 2468 7256 w
(this) 2618 7256 w
(point) 2842 7256 w
(the) 3139 7256 w
(chosen) 3339 7256 w
(protocol) 3727 7256 w
(commences.) 4176 7256 w
(The) 4859 7256 w
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10 /LucidaSansUnicode00 f
(\255 13 \255) 2752 480 w
(final) 720 840 w
(fixed-length) 966 840 w
(reply) 1612 840 w
(is) 1887 840 w
(used) 2000 840 w
(to) 2265 840 w
(make) 2396 840 w
(it) 2691 840 w
(easy) 2790 840 w
(to) 3037 840 w
(delimit) 3168 840 w
(the) 3537 840 w
(I/O) 3725 840 w
(stream) 3918 840 w
(should) 4284 840 w
(the) 4645 840 w
(cho\255) 4833 840 w
(sen protocol require the caller rather than the callee to send the first message.) 720 960 w
(With) 720 1116 w
(this) 990 1116 w
(negotiation) 1225 1116 w
(metaprotocol,) 1832 1116 w
(the) 2565 1116 w
(underlying) 2776 1116 w
(authentication) 3350 1116 w
(protocols) 4101 1116 w
(used) 4612 1116 w
(for) 4901 1116 w
(Plan) 720 1236 w
(9) 961 1236 w
(services) 1064 1236 w
(can) 1491 1236 w
(be) 1699 1236 w
(changed) 1858 1236 w
(under) 2309 1236 w
(any) 2632 1236 w
(application) 2840 1236 w
(just) 3413 1236 w
(by) 3632 1236 w
(changing) 3786 1236 w
(the) 4270 1236 w
(keys) 4464 1236 w
(known) 4720 1236 w
(by the) 720 1356 w
10 /LucidaTypewriter f
(factotum) 1054 1356 w
10 /LucidaSansUnicode00 f
(agents at each end.) 1662 1356 w
(P9any is vulnerable to man in the middle attacks to the extent that the attacker may con\255) 720 1512 w
(strain) 720 1632 w
(the) 1033 1632 w
(possible) 1226 1632 w
(choices) 1667 1632 w
(by) 2066 1632 w
(changing) 2219 1632 w
(the) 2701 1632 w
(stream.) 2893 1632 w
(However,) 3327 1632 w
(we) 3813 1632 w
(believe) 3983 1632 w
(this) 4361 1632 w
(is) 4577 1632 w
(accept\255) 4694 1632 w
(able) 720 1752 w
(since) 960 1752 w
(the) 1247 1752 w
(attacker) 1440 1752 w
(cannot) 1868 1752 w
(force) 2234 1752 w
(either) 2518 1752 w
(side) 2837 1752 w
(to) 3074 1752 w
(choose) 3210 1752 w
(algorithms) 3590 1752 w
(that) 4148 1752 w
(it) 4377 1752 w
(is) 4481 1752 w
(unwilling) 4599 1752 w
(to use.) 720 1872 w
10 /LucidaSans-Demi f
(4.) 720 2112 w
(Library Interface to Factotum) 873 2112 w
10 /LucidaSansUnicode00 f
(Although) 720 2268 w
(programs) 1197 2268 w
(can) 1697 2268 w
(access) 1898 2268 w
10 /LucidaTypewriter f
(factotum) 2246 2268 w
10 /LucidaSansUnicode20 f
(\031) 2822 2268 w
10 /LucidaSansUnicode00 f
(s) 2854 2268 w
(services) 2938 2268 w
(through) 3358 2268 w
(its) 3778 2268 w
(file) 3928 2268 w
(system) 4112 2268 w
(interface,) 4485 2268 w
(it) 4974 2268 w
(is) 720 2388 w
(more) 833 2388 w
(common) 1117 2388 w
(to) 1571 2388 w
(use) 1702 2388 w
(a) 1904 2388 w
(C) 1992 2388 w
(library) 2094 2388 w
(that) 2437 2388 w
(packages) 2661 2388 w
(the) 3145 2388 w
(interaction.) 3333 2388 w
(There) 3950 2388 w
(are) 4261 2388 w
(a number of) 4446 2388 w
(routines in the library, not all of which are relevant here, but a) 720 2508 w
(few) 3780 2508 w
(examples) 3983 2508 w
(should) 4480 2508 w
(give) 4841 2508 w
(their flavor.) 720 2628 w
(First,) 720 2784 w
(consider) 997 2784 w
(the) 1444 2784 w
(problem) 1632 2784 w
(of) 2071 2784 w
(mounting) 2202 2784 w
(a) 2703 2784 w
(remote) 2791 2784 w
(file) 3168 2784 w
(server) 3352 2784 w
(using) 3682 2784 w
(9P.) 3981 2784 w
(An) 4196 2784 w
(earlier) 4360 2784 w
(discus\255) 4700 2784 w
(sion) 720 2904 w
(showed) 964 2904 w
(how) 1375 2904 w
(the) 1616 2904 w
10 /LucidaTypewriter f
(fauth) 1812 2904 w
10 /LucidaSansUnicode00 f
(and) 2213 2904 w
10 /LucidaTypewriter f
(mount) 2433 2904 w
10 /LucidaSansUnicode00 f
(system) 2833 2904 w
(calls) 3213 2904 w
(use) 3468 2904 w
(an) 3677 2904 w
(authentication) 3834 2904 w
(file,) 4569 2904 w
10 /LucidaTypewriter f
(afd) 4792 2904 w
10 /LucidaSansUnicode00 f
(,) 5008 2904 w
(as) 720 3024 w
(a) 865 3024 w
(capability,) 959 3024 w
(but) 1494 3024 w
(not) 1696 3024 w
(how) 1896 3024 w
10 /LucidaTypewriter f
(factotum) 2136 3024 w
10 /LucidaSansUnicode00 f
(manages) 2752 3024 w
10 /LucidaTypewriter f
(afd) 3226 3024 w
10 /LucidaSansUnicode00 f
(.) 3442 3024 w
(The) 3546 3024 w
(library) 3767 3024 w
(contains) 4117 3024 w
(a) 4565 3024 w
(routine,) 4660 3024 w
10 /LucidaTypewriter f
(amount) 720 3144 w
10 /LucidaSansUnicode00 f
(\(authenticated) 1187 3144 w
(mount\),) 1917 3144 w
(that) 2332 3144 w
(is) 2558 3144 w
(used) 2673 3144 w
(by) 2940 3144 w
(most) 3090 3144 w
(programs) 3367 3144 w
(in) 3868 3144 w
(preference) 3993 3144 w
(to) 4546 3144 w
(the) 4678 3144 w
(raw) 4867 3144 w
10 /LucidaTypewriter f
(fauth) 720 3264 w
10 /LucidaSansUnicode00 f
(and) 1126 3264 w
10 /LucidaTypewriter f
(mount) 1352 3264 w
10 /LucidaSansUnicode00 f
(calls.) 1758 3264 w
10 /LucidaTypewriter f
(Amount) 2083 3264 w
10 /LucidaSansUnicode00 f
(engages) 2561 3264 w
10 /LucidaTypewriter f
(factotum) 3011 3264 w
10 /LucidaSansUnicode00 f
(to) 3633 3264 w
(validate) 3778 3264 w
10 /LucidaTypewriter f
(afd) 4201 3264 w
10 /LucidaSansUnicode00 f
(;) 4417 3264 w
(here) 4496 3264 w
(is) 4758 3264 w
(the) 4885 3264 w
(complete code:) 720 3384 w
9 /LucidaTypewriter f
(int) 1008 3554 w
(amount\(int) 1008 3664 w
(fd,) 1723 3664 w
(char) 1983 3664 w
(*mntpt,) 2308 3664 w
(int) 1143 3774 w
(flags,) 1403 3774 w
(char) 1858 3774 w
(*aname\)) 2183 3774 w
({) 1008 3884 w
(int) 1143 3994 w
(afd,) 1403 3994 w
(ret;) 1728 3994 w
(AuthInfo) 1143 4104 w
(*ai;) 1728 4104 w
(afd) 1143 4324 w
(=) 1403 4324 w
(fauth\(fd,) 1533 4324 w
(aname\);) 2183 4324 w
(if\(afd) 1143 4434 w
(>=) 1598 4434 w
(0\){) 1793 4434 w
(ai) 1278 4544 w
(=) 1473 4544 w
(auth_proxy\(afd,) 1603 4544 w
(amount_getkey,) 2643 4544 w
("proto=p9any) 1413 4654 w
(role=client"\);) 2258 4654 w
(if\(ai) 1278 4764 w
(!=) 1668 4764 w
(NULL\)) 1863 4764 w
(auth_freeAI\(ai\);) 1413 4874 w
(}) 1143 4984 w
(ret) 1143 5094 w
(=) 1403 5094 w
(mount\(fd,) 1533 5094 w
(afd,) 2183 5094 w
(mntpt,) 2508 5094 w
(flags,) 1278 5204 w
(aname\);) 1733 5204 w
(if\(afd) 1143 5314 w
(>=) 1598 5314 w
(0\)) 1793 5314 w
(close\(afd\);) 1278 5424 w
(return) 1143 5534 w
(ret;) 1598 5534 w
(}) 1008 5644 w
10 /LucidaSansUnicode00 f
(The) 720 5824 w
(conversation) 939 5824 w
(with) 1595 5824 w
10 /LucidaTypewriter f
(factotum) 1839 5824 w
10 /LucidaSansUnicode00 f
(occurs) 2454 5824 w
(in) 2810 5824 w
(the) 2940 5824 w
(call) 3134 5824 w
(to) 3337 5824 w
10 /LucidaTypewriter f
(auth_proxy) 3474 5824 w
10 /LucidaSansUnicode00 f
(,) 4194 5824 w
(which) 4265 5824 w
(specifies,) 4585 5824 w
(as) 720 5944 w
(a) 859 5944 w
(key) 947 5944 w
(query, which authentication protocol to use \(here the metaprotocol) 1146 5944 w
10 /LucidaTypewriter f
(p9any) 4435 5944 w
10 /LucidaSansUnicode00 f
(\) and) 4795 5944 w
(the) 720 6064 w
(role) 927 6064 w
(being) 1166 6064 w
(played) 1490 6064 w
(\() 1860 6064 w
10 /LucidaTypewriter f
(client) 1893 6064 w
10 /LucidaSansUnicode00 f
(\).) 2325 6064 w
10 /LucidaTypewriter f
(Auth_proxy) 2474 6064 w
10 /LucidaSansUnicode00 f
(will) 3246 6064 w
(read) 3462 6064 w
(and) 3730 6064 w
(write) 3963 6064 w
(the) 4256 6064 w
10 /LucidaTypewriter f
(factotum) 4464 6064 w
10 /LucidaSansUnicode00 f
(files,) 720 6184 w
(and) 1000 6184 w
(the) 1226 6184 w
(authentication) 1427 6184 w
(file) 2168 6184 w
(descriptor) 2365 6184 w
10 /LucidaTypewriter f
(afd) 2904 6184 w
10 /LucidaSansUnicode00 f
(,) 3120 6184 w
(to) 3198 6184 w
(validate) 3342 6184 w
(the) 3764 6184 w
(user) 3965 6184 w
10 /LucidaSansUnicode20 f
(\031) 4175 6184 w
10 /LucidaSansUnicode00 f
(s) 4207 6184 w
(right) 4304 6184 w
(to) 4581 6184 w
(access) 4725 6184 w
(the) 720 6304 w
(service.) 909 6304 w
(If) 1343 6304 w
(the) 1443 6304 w
(call) 1632 6304 w
(is) 1830 6304 w
(successful,) 1944 6304 w
(any) 2511 6304 w
(auxiliary) 2714 6304 w
(data,) 3161 6304 w
(held) 3437 6304 w
(in) 3681 6304 w
(an) 3807 6304 w
10 /LucidaTypewriter f
(AuthInfo) 3959 6304 w
10 /LucidaSansUnicode00 f
(structure,) 4570 6304 w
(is) 720 6424 w
(freed.) 837 6424 w
(In) 1191 6424 w
(any) 1319 6424 w
(case,) 1525 6424 w
(the) 1807 6424 w
10 /LucidaTypewriter f
(mount) 1999 6424 w
10 /LucidaSansUnicode00 f
(is) 2396 6424 w
(then) 2513 6424 w
(called) 2767 6424 w
(with) 3087 6424 w
(the) 3329 6424 w
(\(perhaps) 3521 6424 w
(validated\)) 3982 6424 w
10 /LucidaTypewriter f
(afd.) 4491 6424 w
10 /LucidaSansUnicode00 f
(A) 4816 6424 w
(9P) 4922 6424 w
(server) 720 6544 w
(can) 1060 6544 w
(cause) 1271 6544 w
(the) 1590 6544 w
10 /LucidaTypewriter f
(fauth) 1789 6544 w
10 /LucidaSansUnicode00 f
(system) 2193 6544 w
(call) 2577 6544 w
(to) 2785 6544 w
(fail,) 2927 6544 w
(as) 3153 6544 w
(an) 3303 6544 w
(indication) 3464 6544 w
(that) 3986 6544 w
(authentication) 4221 6544 w
(is) 4960 6544 w
(not required to access the service.) 720 6664 w
(The) 720 6820 w
(second) 950 6820 w
(argument) 1343 6820 w
(to) 1860 6820 w
10 /LucidaTypewriter f
(auth_proxy) 2007 6820 w
10 /LucidaSansUnicode00 f
(is) 2776 6820 w
(a) 2905 6820 w
(function,) 3009 6820 w
(here) 3491 6820 w
10 /LucidaTypewriter f
(amount_getkey) 3755 6820 w
10 /LucidaSansUnicode00 f
(,) 4691 6820 w
(to) 4773 6820 w
(be) 4921 6820 w
(called) 720 6940 w
(if) 1037 6940 w
(secret) 1137 6940 w
(information) 1463 6940 w
(such) 2064 6940 w
(as) 2324 6940 w
(a) 2464 6940 w
(password) 2553 6940 w
(or) 3049 6940 w
(response) 3185 6940 w
(to) 3660 6940 w
(a) 3792 6940 w
(challenge) 3881 6940 w
(is) 4377 6940 w
(required) 4490 6940 w
(as) 4934 6940 w
(part) 720 7060 w
(of) 949 7060 w
(the) 1080 7060 w
(authentication.) 1268 7060 w
(This) 2060 7060 w
(function,) 2298 7060 w
(of) 2764 7060 w
(course,) 2895 7060 w
(will) 3282 7060 w
(provide) 3479 7060 w
(this) 3877 7060 w
(data) 4089 7060 w
(to) 4332 7060 w
10 /LucidaTypewriter f
(factotum) 4464 7060 w
10 /LucidaSansUnicode00 f
(as a) 720 7180 w
10 /LucidaTypewriter f
(key) 945 7180 w
10 /LucidaSansUnicode00 f
(message on the) 1193 7180 w
10 /LucidaTypewriter f
(/mnt/factotum/ctl) 1991 7180 w
10 /LucidaSansUnicode00 f
(file.) 3247 7180 w
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14 pagesetup
10 /LucidaSansUnicode00 f
(\255 14 \255) 2752 480 w
(Although) 720 840 w
(the) 1197 840 w
(final) 1385 840 w
(argument) 1630 840 w
(to) 2131 840 w
10 /LucidaTypewriter f
(auth_proxy) 2262 840 w
10 /LucidaSansUnicode00 f
(in) 3015 840 w
(this) 3139 840 w
(example) 3351 840 w
(is) 3797 840 w
(a) 3910 840 w
(simple) 3999 840 w
(string,) 4354 840 w
(in) 4702 840 w
(gen\255) 4827 840 w
(eral) 720 960 w
(it) 941 960 w
(can) 1047 960 w
(be) 1255 960 w
(a) 1414 960 w
(formatted-print) 1509 960 w
(specifier) 2318 960 w
(in) 2770 960 w
(the) 2900 960 w
(manner) 3094 960 w
(of) 3502 960 w
10 /LucidaTypewriter f
(printf) 3639 960 w
10 /LucidaSansUnicode00 f
(,) 4071 960 w
(to) 4142 960 w
(enable) 4279 960 w
(the) 4639 960 w
(con\255) 4833 960 w
(struction of more elaborate key queries.) 720 1080 w
(As) 720 1236 w
(another) 881 1236 w
(example,) 1296 1236 w
(consider) 1782 1236 w
(the) 2237 1236 w
(Plan) 2433 1236 w
(9) 2675 1236 w
10 /LucidaTypewriter f
(cpu) 2779 1236 w
10 /LucidaSansUnicode00 f
(service,) 3036 1236 w
(which) 3445 1236 w
(exports) 3767 1236 w
(local) 4178 1236 w
(devices) 4445 1236 w
(to) 4845 1236 w
(a) 4985 1236 w
(shell) 720 1356 w
(process) 980 1356 w
(on) 1387 1356 w
(a) 1543 1356 w
(remote) 1631 1356 w
(machine,) 2008 1356 w
(typically) 2481 1356 w
(to) 2911 1356 w
(connect) 3042 1356 w
(the) 3455 1356 w
(local screen and keyboard to) 3643 1356 w
(a) 720 1476 w
(more) 814 1476 w
(powerful) 1104 1476 w
(computer.) 1569 1476 w
(At) 2136 1476 w
(heart,) 2281 1476 w
10 /LucidaTypewriter f
(cpu) 2604 1476 w
10 /LucidaSansUnicode00 f
(is) 2860 1476 w
(a) 2980 1476 w
(superset) 3075 1476 w
(of) 3532 1476 w
(a) 3670 1476 w
(service) 3765 1476 w
(called) 4141 1476 w
10 /LucidaTypewriter f
(exportfs) 4464 1476 w
10 /LucidaSansUnicode00 f
([Pike93],) 720 1596 w
(which) 1178 1596 w
(allows) 1495 1596 w
(one) 1833 1596 w
(machine) 2048 1596 w
(to) 2492 1596 w
(see) 2626 1596 w
(an) 2825 1596 w
(arbitrary) 2978 1596 w
(portion) 3428 1596 w
(of) 3818 1596 w
(the) 3952 1596 w
(file) 4143 1596 w
(name) 4330 1596 w
(space) 4631 1596 w
(of) 4942 1596 w
(another) 720 1716 w
(machine,) 1129 1716 w
(such) 1604 1716 w
(as) 1865 1716 w
(to) 2006 1716 w
(export) 2139 1716 w
(the) 2493 1716 w
(network) 2683 1716 w
(device) 3110 1716 w
(to) 3452 1716 w
(another) 3585 1716 w
(machine) 3994 1716 w
(for) 4438 1716 w
(gateway\255) 4613 1716 w
(ing.) 720 1836 w
(However,) 972 1836 w
10 /LucidaTypewriter f
(cpu) 1456 1836 w
10 /LucidaSansUnicode00 f
(is) 1707 1836 w
(not) 1822 1836 w
(just) 2016 1836 w
10 /LucidaTypewriter f
(exportfs) 2230 1836 w
10 /LucidaSansUnicode00 f
(because) 2840 1836 w
(it) 3268 1836 w
(also) 3368 1836 w
(delivers) 3598 1836 w
(signals) 4009 1836 w
(such) 4382 1836 w
(as) 4642 1836 w
(inter\255) 4782 1836 w
(rupt and negotiates the initial environment for the remote shell.) 720 1956 w
(To) 720 2112 w
(authenticate) 889 2112 w
(an) 1533 2112 w
(instance) 1695 2112 w
(of) 2143 2112 w
10 /LucidaTypewriter f
(cpu) 2286 2112 w
10 /LucidaSansUnicode00 f
(requires) 2547 2112 w
10 /LucidaTypewriter f
(factotum) 2991 2112 w
10 /LucidaSansUnicode00 f
(processes) 3612 2112 w
(on) 4138 2112 w
(both) 4306 2112 w
(ends:) 4575 2112 w
(the) 4885 2112 w
(local, client end running as the user on a terminal and the remote, server end running as) 720 2232 w
(the host owner of the server machine.) 720 2352 w
(Here is schematic code for the two ends:) 2629 2352 w
9 /LucidaTypewriter f
(/*) 1008 2522 w
(client) 1203 2522 w
(*/) 1658 2522 w
(int) 1008 2632 w
(p9auth\(int) 1008 2742 w
(fd\)) 1723 2742 w
({) 1008 2852 w
(AuthInfo) 1143 2962 w
(*ai;) 1728 2962 w
(ai) 1143 3182 w
(=) 1338 3182 w
(auth_proxy\(fd,) 1468 3182 w
(auth_getkey,) 2443 3182 w
("proto=p9any) 1278 3292 w
(role=client"\);) 2123 3292 w
(if\(ai) 1143 3402 w
(==) 1533 3402 w
(NULL\)) 1728 3402 w
(return) 1278 3512 w
(-1;) 1733 3512 w
(/*) 1143 3732 w
(start) 1338 3732 w
(cpu) 1728 3732 w
(protocol) 1988 3732 w
(here) 2573 3732 w
(*/) 2898 3732 w
(}) 1008 3842 w
(/*) 1008 4062 w
(server) 1203 4062 w
(*/) 1658 4062 w
(int) 1008 4172 w
(srvp9auth\(int) 1008 4282 w
(fd,) 1918 4282 w
(char) 2178 4282 w
(*user\)) 2503 4282 w
({) 1008 4392 w
(AuthInfo) 1143 4502 w
(*ai;) 1728 4502 w
(ai) 1143 4722 w
(=) 1338 4722 w
(auth_proxy\(fd,) 1468 4722 w
(NULL,) 2443 4722 w
("proto=p9any) 1278 4832 w
(role=server"\);) 2123 4832 w
(if\(ai) 1143 4942 w
(==) 1533 4942 w
(NULL\)) 1728 4942 w
(return) 1278 5052 w
(-1;) 1733 5052 w
(/*) 1143 5162 w
(set) 1338 5162 w
(user) 1598 5162 w
(id) 1923 5162 w
(for) 2118 5162 w
(server) 2378 5162 w
(process) 2833 5162 w
(*/) 3353 5162 w
(if\(auth_chuid\(ai,) 1143 5272 w
(NULL\)) 2313 5272 w
(<) 2703 5272 w
(0\)) 2833 5272 w
(return) 1278 5382 w
(-1;) 1733 5382 w
(/*) 1143 5602 w
(start) 1338 5602 w
(cpu) 1728 5602 w
(protocol) 1988 5602 w
(here) 2573 5602 w
(*/) 2898 5602 w
(}) 1008 5712 w
10 /LucidaTypewriter f
(Auth_chuid) 720 5892 w
10 /LucidaSansUnicode00 f
(encapsulates) 1488 5892 w
(the) 2165 5892 w
(negotiation) 2369 5892 w
(to) 2969 5892 w
(change) 3116 5892 w
(a) 3513 5892 w
(user) 3617 5892 w
(id) 3876 5892 w
(using) 4017 5892 w
(the) 4332 5892 w
10 /LucidaTypewriter f
(caphash) 4536 5892 w
10 /LucidaSansUnicode00 f
(and) 720 6012 w
10 /LucidaTypewriter f
(capuse) 937 6012 w
10 /LucidaSansUnicode00 f
(files) 1406 6012 w
(of) 1645 6012 w
(the) 1780 6012 w
(\(server\)) 1972 6012 w
(kernel.) 2372 6012 w
(Note) 2775 6012 w
(that) 3040 6012 w
(although) 3268 6012 w
(the) 3735 6012 w
(client) 3927 6012 w
(process) 4228 6012 w
(may) 4639 6012 w
(ask) 4876 6012 w
(the) 720 6132 w
(user) 911 6132 w
(for) 1157 6132 w
(new) 1333 6132 w
(keys,) 1565 6132 w
(using) 1851 6132 w
10 /LucidaTypewriter f
(auth_getkey) 2154 6132 w
10 /LucidaSansUnicode00 f
(,) 2946 6132 w
(the) 3015 6132 w
(server) 3207 6132 w
(machine,) 3541 6132 w
(presumably) 4018 6132 w
(a) 4620 6132 w
(shared) 4712 6132 w
(machine with a pseudo-user for the host owner, sets the key-getting function to) 720 6252 w
10 /LucidaTypewriter f
(NULL) 4680 6252 w
10 /LucidaSansUnicode00 f
(.) 4968 6252 w
10 /LucidaSans-Demi f
(5.) 720 6492 w
(Secure Store) 873 6492 w
10 /LucidaTypewriter f
(Factotum) 720 6648 w
10 /LucidaSansUnicode00 f
(stores) 1337 6648 w
(keys) 1675 6648 w
(in) 1933 6648 w
(volatile) 2065 6648 w
(RAM) 2454 6648 w
(that) 2713 6648 w
(must) 2946 6648 w
(be) 3231 6648 w
(initialized) 3392 6648 w
(at) 3909 6648 w
(boot) 4043 6648 w
(time.) 4307 6648 w
(To) 4628 6648 w
(store) 4794 6648 w
(the) 720 6768 w
(keys,) 911 6768 w
(therefore,) 1196 6768 w
10 /LucidaTypewriter f
(factotum) 1711 6768 w
10 /LucidaSansUnicode00 f
(must) 2323 6768 w
(be) 2602 6768 w
(supplemented) 2757 6768 w
(by) 3484 6768 w
(a) 3635 6768 w
(persistent) 3726 6768 w
(store,) 4245 6768 w
(perhaps) 4559 6768 w
(a) 4985 6768 w
(floppy) 720 6888 w
(disk) 1168 6888 w
(containing) 1512 6888 w
(a) 2165 6888 w
(key) 2363 6888 w
(file) 2672 6888 w
(of) 2966 6888 w
(commands) 3207 6888 w
(to) 3879 6888 w
(be) 4121 6888 w
(copied) 4384 6888 w
(into) 4851 6888 w
10 /LucidaTypewriter f
(/mnt/factotum/ctl) 720 7008 w
10 /LucidaSansUnicode00 f
(during) 2006 7008 w
(bootstrap.) 2387 7008 w
(But) 2982 7008 w
(removable) 3200 7008 w
(media) 3767 7008 w
(are) 4124 7008 w
(a) 4337 7008 w
(nuisance) 4453 7008 w
(to) 4942 7008 w
(carry) 720 7128 w
(and) 1000 7128 w
(are) 1220 7128 w
(vulnerable) 1412 7128 w
(to) 1957 7128 w
(theft.) 2095 7128 w
(Keys) 2428 7128 w
(could) 2693 7128 w
(be) 3000 7128 w
(stored) 3160 7128 w
(encrypted) 3510 7128 w
(on) 4032 7128 w
(a) 4196 7128 w
(shared) 4292 7128 w
(file) 4661 7128 w
(sys\255) 4853 7128 w
(tem,) 720 7248 w
(but) 974 7248 w
(only) 1172 7248 w
(if) 1412 7248 w
(those) 1514 7248 w
(keys) 1817 7248 w
(are) 2070 7248 w
(not) 2258 7248 w
(necessary) 2454 7248 w
(for) 2965 7248 w
(authenticating) 3140 7248 w
(to) 3872 7248 w
(the) 4006 7248 w
(file) 4197 7248 w
(system) 4384 7248 w
(in) 4759 7248 w
(the) 4885 7248 w
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15 pagesetup
10 /LucidaSansUnicode00 f
(\255 15 \255) 2752 480 w
(first place.) 720 840 w
(Even if the keys are) 1297 840 w
(encrypted) 2272 840 w
(under) 2786 840 w
(a) 3103 840 w
(user) 3191 840 w
(password,) 3434 840 w
(a) 3961 840 w
(thief) 4049 840 w
(might) 4303 840 w
(well) 4619 840 w
(suc\255) 4843 840 w
(ceed) 720 960 w
(with) 1003 960 w
(a) 1265 960 w
(dictionary) 1377 960 w
(attack.) 1914 960 w
(Other) 2328 960 w
(risks) 2659 960 w
(of) 2946 960 w
(local) 3101 960 w
(storage) 3383 960 w
(are) 3802 960 w
(loss) 4010 960 w
(of) 4258 960 w
(the) 4412 960 w
(contents) 4623 960 w
(through) 720 1080 w
(mechanical) 1143 1080 w
(mishap) 1722 1080 w
(or) 2111 1080 w
(dead) 2249 1080 w
(batteries.) 2522 1080 w
(Thus) 3047 1080 w
(for) 3321 1080 w
(convenience) 3496 1080 w
(and) 4130 1080 w
(safety) 4347 1080 w
(we) 4672 1080 w
(pro\255) 4842 1080 w
(vide) 720 1200 w
(a) 964 1200 w
10 /LucidaTypewriter f
(secstore) 1063 1200 w
10 /LucidaSansUnicode00 f
(\(secure) 1683 1200 w
(store\)) 2077 1200 w
(server) 2400 1200 w
(in) 2741 1200 w
(the) 2876 1200 w
(network) 3075 1200 w
(to) 3511 1200 w
(hold) 3653 1200 w
(each) 3912 1200 w
(user) 4179 1200 w
10 /LucidaSansUnicode20 f
(\031) 4389 1200 w
10 /LucidaSansUnicode00 f
(s) 4421 1200 w
(permanent) 4515 1200 w
(list of keys, a) 720 1320 w
10 /LucidaSans-Italic f
(key file) 1396 1320 w
10 /LucidaSansUnicode00 f
(.) 1743 1320 w
10 /LucidaTypewriter f
(Secstore) 720 1476 w
10 /LucidaSansUnicode00 f
(is) 1333 1476 w
(a) 1450 1476 w
(file) 1542 1476 w
(server) 1730 1476 w
(for) 2064 1476 w
(encrypted) 2240 1476 w
(data,) 2758 1476 w
(used) 3037 1476 w
(only) 3307 1476 w
(during) 3549 1476 w
(bootstrapping.) 3906 1476 w
(It) 4693 1476 w
(must) 4797 1476 w
(provide) 720 1596 w
(strong) 1118 1596 w
(authentication) 1465 1596 w
(and) 2193 1596 w
(resistance) 2406 1596 w
(to) 2928 1596 w
(passive) 3059 1596 w
(and) 3449 1596 w
(active) 3662 1596 w
(protocol attacks while) 3975 1596 w
(assuming) 720 1716 w
(nothing) 1223 1716 w
(more) 1636 1716 w
(from) 1925 1716 w
(the) 2195 1716 w
(client) 2388 1716 w
(than) 2691 1716 w
(a) 2946 1716 w
(password.) 3040 1716 w
(Once) 3605 1716 w
10 /LucidaTypewriter f
(factotum) 3891 1716 w
10 /LucidaSansUnicode00 f
(has) 4506 1716 w
(loaded) 4713 1716 w
(the) 720 1836 w
(key file, further encrypted or authenticated file storage can be accomplished by stan\255) 908 1836 w
(dard mechanisms.) 720 1956 w
(The) 720 2112 w
(cryptographic) 963 2112 w
(technology) 1693 2112 w
(that) 2288 2112 w
(enables) 2541 2112 w
10 /LucidaTypewriter f
(secstore) 2975 2112 w
10 /LucidaSansUnicode00 f
(is) 3613 2112 w
(a) 3756 2112 w
(form) 3874 2112 w
(of) 4169 2112 w
(encrypted) 4330 2112 w
(key) 4874 2112 w
(exchange) 720 2232 w
(called) 1232 2232 w
(PAK) 1562 2232 w
([Boyk00],) 1798 2232 w
(analogous) 2298 2232 w
(to) 2843 2232 w
(EKE) 2988 2232 w
([Bell93],) 3208 2232 w
(SRP) 3651 2232 w
([Wu98],) 3870 2232 w
(or) 4288 2232 w
(SPEKE) 4436 2232 w
([Jabl].) 4764 2232 w
(PAK) 720 2352 w
(was) 960 2352 w
(chosen) 1194 2352 w
(because) 1588 2352 w
(it) 2033 2352 w
(comes) 2150 2352 w
(with) 2514 2352 w
(a) 2771 2352 w
(proof) 2878 2352 w
(of) 3193 2352 w
(equivalence) 3343 2352 w
(in) 3966 2352 w
(strength) 4109 2352 w
(to) 4569 2352 w
(Diffie-) 4719 2352 w
(Hellman;) 720 2472 w
(subtle) 1189 2472 w
(flaws) 1526 2472 w
(in) 1814 2472 w
(some) 1944 2472 w
(earlier) 2244 2472 w
(encrypted) 2589 2472 w
(key) 3108 2472 w
(exchange) 3312 2472 w
(protocols) 3815 2472 w
(and) 4308 2472 w
(implemen\255) 4526 2472 w
(tations have encouraged us to take special care.) 720 2592 w
(In outline, the PAK protocol is:) 3120 2592 w
11 /LucidaSans-Italic f
(C) 1008 2762 w
11 /S f
(\256) 1092 2762 w
11 /LucidaSans-Italic f
(S) 1210 2762 w
11 /LucidaSansUnicode00 f
(:) 1280 2762 w
11 /LucidaSans-Italic f
(C) 1412 2762 w
11 /LucidaSansUnicode00 f
(,) 1496 2762 w
11 /LucidaSans-Italic f
(g) 1540 2762 w
8 /LucidaSans-Italic f
(x) 1620 2718 w
11 /LucidaSans-Italic f
(H) 1672 2762 w
(S) 1008 2872 w
11 /S f
(\256) 1078 2872 w
11 /LucidaSans-Italic f
(C) 1196 2872 w
11 /LucidaSansUnicode00 f
(:) 1280 2872 w
11 /LucidaSans-Italic f
(S) 1412 2872 w
11 /LucidaSansUnicode00 f
(,) 1482 2872 w
11 /LucidaSans-Italic f
(g) 1526 2872 w
8 /LucidaSans-Italic f
(y) 1606 2828 w
11 /LucidaSansUnicode00 f
(,) 1668 2872 w
11 /LucidaSans-Italic f
(hash) 1712 2872 w
11 /LucidaSansUnicode00 f
(\() 1978 2872 w
11 /LucidaSans-Italic f
(g) 2023 2872 w
8 /LucidaSans-Italic f
(xy) 2103 2828 w
11 /LucidaSansUnicode00 f
(,) 2208 2872 w
11 /LucidaSans-Italic f
(C) 2252 2872 w
11 /LucidaSansUnicode00 f
(,) 2336 2872 w
11 /LucidaSans-Italic f
(S) 2380 2872 w
11 /LucidaSansUnicode00 f
(\)) 2450 2872 w
11 /LucidaSans-Italic f
(C) 1008 2982 w
11 /S f
(\256) 1092 2982 w
11 /LucidaSans-Italic f
(S) 1210 2982 w
11 /LucidaSansUnicode00 f
(:) 1280 2982 w
11 /LucidaSans-Italic f
(hash) 1412 2982 w
11 /LucidaSansUnicode00 f
(\() 1678 2982 w
11 /LucidaSans-Italic f
(g) 1723 2982 w
8 /LucidaSans-Italic f
(xy) 1803 2938 w
11 /LucidaSansUnicode00 f
(,) 1908 2982 w
11 /LucidaSans-Italic f
(S) 1952 2982 w
11 /LucidaSansUnicode00 f
(,) 2022 2982 w
11 /LucidaSans-Italic f
(C) 2066 2982 w
11 /LucidaSansUnicode00 f
(\)) 2150 2982 w
10 /LucidaSansUnicode00 f
(where) 720 3162 w
11 /LucidaSans-Italic f
(H) 1047 3162 w
10 /LucidaSansUnicode00 f
(is) 1163 3162 w
(a) 1278 3162 w
(preshared) 1368 3162 w
(secret) 1891 3162 w
(between) 2218 3162 w
(client) 2660 3162 w
11 /LucidaSans-Italic f
(C) 2959 3162 w
10 /LucidaSansUnicode00 f
(and) 3070 3162 w
(server) 3286 3162 w
11 /LucidaSans-Italic f
(S) 3619 3162 w
10 /LucidaSansUnicode00 f
(.) 3680 3162 w
(There) 3780 3162 w
(are) 4094 3162 w
(several) 4282 3162 w
(variants) 4658 3162 w
(of) 720 3282 w
(PAK,) 862 3282 w
(all) 1126 3282 w
(presented) 1282 3282 w
(in) 1810 3282 w
(papers) 1944 3282 w
(mainly) 2316 3282 w
(concerned) 2679 3282 w
(with) 3225 3282 w
(proofs) 3473 3282 w
(of) 3830 3282 w
(cryptographic) 3971 3282 w
(proper\255) 4682 3282 w
(ties.) 720 3402 w
(To) 992 3402 w
(aid) 1151 3402 w
(implementers,) 1333 3402 w
(we) 2066 3402 w
(have) 2234 3402 w
(distilled) 2494 3402 w
(a) 2916 3402 w
(description) 3007 3402 w
(of) 3586 3402 w
(the) 3720 3402 w
(specific) 3911 3402 w
(version) 4314 3402 w
(we) 4702 3402 w
(use) 4871 3402 w
(into an Appendix to this paper.) 720 3522 w
(As) 720 3678 w
(a) 883 3678 w
(further) 981 3678 w
(layer) 1360 3678 w
(of) 1636 3678 w
(defense) 1777 3678 w
(against) 2201 3678 w
(password) 2595 3678 w
(theft,) 3100 3678 w
(we) 3404 3678 w
(provide) 3580 3678 w
(\(within) 3988 3678 w
(the) 4360 3678 w
(encrypted) 4559 3678 w
(channel) 720 3798 w
11 /LucidaSans-Italic f
(C) 1131 3798 w
11 /LucidaSansUnicode21 f
(\222) 1215 3798 w
11 /LucidaSans-Italic f
(S) 1327 3798 w
10 /LucidaSansUnicode00 f
(\)) 1388 3798 w
(information) 1454 3798 w
(that) 2054 3798 w
(is) 2278 3798 w
(validated) 2391 3798 w
(at) 2863 3798 w
(a) 2988 3798 w
(RADIUS) 3076 3798 w
(server,) 3468 3798 w
(such) 3830 3798 w
(as) 4089 3798 w
(the) 4228 3798 w
(digits) 4416 3798 w
(from) 4720 3798 w
(a) 4985 3798 w
(hardware) 720 3918 w
(token) 1216 3918 w
([RFC2138].) 1536 3918 w
(This) 2151 3918 w
(provides) 2403 3918 w
(two-factor) 2866 3918 w
(authentication,) 3428 3918 w
(which) 4202 3918 w
(potentially) 4530 3918 w
(requires tricking two independent administrators in any attack by social engineering.) 720 4038 w
(The) 720 4194 w
(key) 940 4194 w
(file) 1145 4194 w
(stored) 1335 4194 w
(on) 1683 4194 w
(the) 1846 4194 w
(server) 2041 4194 w
(is) 2378 4194 w
(encrypted) 2498 4194 w
(with) 3019 4194 w
(AES) 3264 4194 w
(\(Rijndael\)) 3481 4194 w
(using) 3974 4194 w
(CBC) 4280 4194 w
(with) 4516 4194 w
(a) 4761 4194 w
(10-) 4856 4194 w
(byte) 720 4314 w
(initialization) 970 4314 w
(vector) 1612 4314 w
(and) 1952 4314 w
(trailing) 2173 4314 w
(authentication) 2558 4314 w
(padding.) 3294 4314 w
(All) 3796 4314 w
(this) 3964 4314 w
(is) 4184 4314 w
(invisible) 4305 4314 w
(to) 4746 4314 w
(the) 4885 4314 w
(user) 720 4434 w
(of) 970 4434 w
10 /LucidaTypewriter f
(secstore) 1108 4434 w
10 /LucidaSansUnicode00 f
(.) 1684 4434 w
(For) 1788 4434 w
(that) 1984 4434 w
(matter,) 2215 4434 w
(it) 2606 4434 w
(is) 2712 4434 w
(invisible) 2832 4434 w
(to) 3273 4434 w
(the) 3412 4434 w
10 /LucidaTypewriter f
(secstore) 3608 4434 w
10 /LucidaSansUnicode00 f
(server) 4225 4434 w
(as) 4563 4434 w
(well;) 4710 4434 w
(if) 4974 4434 w
(the) 720 4554 w
(AES) 914 4554 w
(Modes) 1130 4554 w
(of) 1486 4554 w
(Operation) 1623 4554 w
(are) 2144 4554 w
(standardized) 2334 4554 w
(and) 3004 4554 w
(a) 3222 4554 w
(new) 3315 4554 w
(encryption) 3548 4554 w
(format) 4100 4554 w
(designed,) 4462 4554 w
(it) 4974 4554 w
(can) 720 4674 w
(be) 925 4674 w
(implemented) 1081 4674 w
(by) 1755 4674 w
(a) 1907 4674 w
(client) 1999 4674 w
(without) 2300 4674 w
(change) 2702 4674 w
(to) 3088 4674 w
(the) 3224 4674 w
(server.) 3417 4674 w
(The) 3816 4674 w
10 /LucidaTypewriter f
(secstore) 4035 4674 w
10 /LucidaSansUnicode00 f
(is) 4649 4674 w
(delib\255) 4767 4674 w
(erately) 720 4794 w
(not) 1087 4794 w
(backed) 1288 4794 w
(up;) 1675 4794 w
(the) 1905 4794 w
(user) 2101 4794 w
(is) 2352 4794 w
(expected) 2472 4794 w
(to) 2955 4794 w
(use) 3093 4794 w
(more) 3302 4794 w
(than) 3593 4794 w
(one) 3849 4794 w
10 /LucidaTypewriter f
(secstore) 4068 4794 w
10 /LucidaSansUnicode00 f
(or) 4684 4794 w
(save) 4826 4794 w
(the) 720 4914 w
(key) 908 4914 w
(file) 1107 4914 w
(on) 1291 4914 w
(removable) 1447 4914 w
(media) 1986 4914 w
(and) 2315 4914 w
(lock) 2528 4914 w
(it) 2760 4914 w
(away.) 2859 4914 w
(The) 3195 4914 w
(user) 3409 4914 w
10 /LucidaSansUnicode20 f
(\031) 3619 4914 w
10 /LucidaSansUnicode00 f
(s) 3651 4914 w
(password) 3735 4914 w
(is) 4230 4914 w
(hashed) 4344 4914 w
(to) 4727 4914 w
(cre\255) 4859 4914 w
(ate) 720 5034 w
(the) 905 5034 w
11 /LucidaSans-Italic f
(H) 1097 5034 w
10 /LucidaSansUnicode00 f
(used) 1215 5034 w
(in) 1484 5034 w
(the) 1612 5034 w
(PAK) 1804 5034 w
(protocol;) 2030 5034 w
(a) 2535 5034 w
(different) 2627 5034 w
(hash) 3082 5034 w
(of) 3349 5034 w
(the) 3483 5034 w
(password) 3674 5034 w
(is) 4172 5034 w
(used) 4288 5034 w
(as) 4556 5034 w
(the) 4698 5034 w
(file) 4889 5034 w
(encryption) 720 5154 w
(key.) 1275 5154 w
(Finally,) 1546 5154 w
(there) 1929 5154 w
(is) 2222 5154 w
(a) 2343 5154 w
(command) 2439 5154 w
(\(inside) 2958 5154 w
(the) 3322 5154 w
(authenticated,) 3518 5154 w
(encrypted) 4254 5154 w
(chan\255) 4777 5154 w
(nel) 720 5274 w
(between) 906 5274 w
(client) 1352 5274 w
(and) 1655 5274 w
10 /LucidaTypewriter f
(secstore) 1874 5274 w
10 /LucidaSansUnicode00 f
(\)) 2450 5274 w
(to) 2522 5274 w
(change) 2659 5274 w
(passwords) 3046 5274 w
(by) 3598 5274 w
(sending) 3752 5274 w
(a) 4176 5274 w
(new) 4270 5274 w
11 /LucidaSans-Italic f
(H) 4504 5274 w
10 /LucidaSansUnicode00 f
(;) 4585 5274 w
(for) 4656 5274 w
(con\255) 4833 5274 w
(sistency, the client process must at the same time fetch and re-encrypt all files.) 720 5394 w
(When) 720 5550 w
10 /LucidaTypewriter f
(factotum) 1023 5550 w
10 /LucidaSansUnicode00 f
(starts,) 1636 5550 w
(it) 1978 5550 w
(dials) 2082 5550 w
(the) 2347 5550 w
(local) 2540 5550 w
10 /LucidaTypewriter f
(secstore) 2803 5550 w
10 /LucidaSansUnicode00 f
(and) 3417 5550 w
(checks) 3635 5550 w
(whether) 4002 5550 w
(the) 4431 5550 w
(user) 4624 5550 w
(has) 4872 5550 w
(an) 720 5670 w
(account.) 880 5670 w
(If) 1366 5670 w
(so,) 1475 5670 w
(it) 1662 5670 w
(prompts) 1771 5670 w
(for) 2223 5670 w
(the) 2405 5670 w
(user) 2603 5670 w
10 /LucidaSansUnicode20 f
(\031) 2813 5670 w
10 /LucidaSansUnicode00 f
(s) 2845 5670 w
10 /LucidaTypewriter f
(secstore) 2939 5670 w
10 /LucidaSansUnicode00 f
(password) 3558 5670 w
(and) 4063 5670 w
(fetches) 4285 5670 w
(the) 4677 5670 w
(key) 4874 5670 w
(file.) 720 5790 w
(The) 969 5790 w
(PAK) 1184 5790 w
(protocol) 1407 5790 w
(ensures) 1845 5790 w
(mutual) 2258 5790 w
(authentication) 2630 5790 w
(and) 3359 5790 w
(prevents) 3573 5790 w
(dictionary) 4025 5790 w
(attacks) 4539 5790 w
(on) 4917 5790 w
(the) 720 5910 w
(password) 920 5910 w
(by) 1427 5910 w
(passive) 1587 5910 w
(wiretappers) 1989 5910 w
(or) 2603 5910 w
(active) 2750 5910 w
(intermediaries.) 3074 5910 w
(Passwords) 3880 5910 w
(saved) 4429 5910 w
(in) 4750 5910 w
(the) 4885 5910 w
(key) 720 6030 w
(file) 923 6030 w
(can) 1111 6030 w
(be) 1317 6030 w
(long) 1474 6030 w
(random) 1726 6030 w
(strings) 2139 6030 w
(suitable) 2510 6030 w
(for) 2930 6030 w
(simpler) 3107 6030 w
(challenge/response) 3507 6030 w
(authentica\255) 4501 6030 w
(tion) 720 6150 w
(protocols.) 946 6150 w
(Thus) 1501 6150 w
(the) 1775 6150 w
(user) 1966 6150 w
(need) 2212 6150 w
(only) 2485 6150 w
(remember) 2725 6150 w
(a) 3260 6150 w
(single,) 3351 6150 w
(weaker) 3708 6150 w
(password) 4087 6150 w
(to) 4585 6150 w
(enable) 4719 6150 w
(strong,) 720 6270 w
10 /LucidaSansUnicode20 f
(\030\030) 1128 6270 w
10 /LucidaSansUnicode00 f
(single) 1192 6270 w
(sign) 1543 6270 w
(on) 1810 6270 w
10 /LucidaSansUnicode20 f
(\031\031) 1933 6270 w
10 /LucidaSansUnicode00 f
(authentication) 2060 6270 w
(to) 2818 6270 w
(unchanged) 2979 6270 w
(legacy) 3577 6270 w
(applications) 3945 6270 w
(scattered) 4593 6270 w
(across multiple authentication domains.) 720 6390 w
10 /LucidaSans-Demi f
(6.) 720 6630 w
(Transport Layer Security) 873 6630 w
10 /LucidaSansUnicode00 f
(Since) 720 6786 w
(the) 1018 6786 w
(Plan) 1219 6786 w
(9) 1467 6786 w
(operating) 1577 6786 w
(system) 2090 6786 w
(is) 2477 6786 w
(designed) 2604 6786 w
(for) 3093 6786 w
(use) 3279 6786 w
(in) 3495 6786 w
(network) 3633 6786 w
(elements) 4072 6786 w
(that) 4559 6786 w
(must) 4797 6786 w
(withstand) 720 6906 w
(direct) 1226 6906 w
(attack,) 1536 6906 w
(unguarded) 1894 6906 w
(by) 2453 6906 w
(firewall) 2601 6906 w
(or) 2987 6906 w
(VPN,) 3122 6906 w
(we) 3381 6906 w
(seek) 3547 6906 w
(to) 3801 6906 w
(ensure) 3932 6906 w
(that) 4293 6906 w
(all applica\255) 4517 6906 w
(tions) 720 7026 w
(use) 1003 7026 w
(channels) 1215 7026 w
(with) 1686 7026 w
(appropriate) 1934 7026 w
(mutual) 2541 7026 w
(authentication) 2922 7026 w
(and) 3660 7026 w
(encryption.) 3883 7026 w
(A) 4505 7026 w
(principal) 4618 7026 w
(tool) 720 7146 w
(for) 946 7146 w
(this) 1123 7146 w
(is) 1340 7146 w
(TLS) 1458 7146 w
(1.0) 1666 7146 w
([RFC2246].) 1862 7146 w
(\(TLS) 2467 7146 w
(1.0) 2707 7146 w
(is) 2902 7146 w
(nearly) 3019 7146 w
(the) 3351 7146 w
(same) 3543 7146 w
(as) 3835 7146 w
(SSL) 3978 7146 w
(3.0,) 4176 7146 w
(and) 4403 7146 w
(our) 4620 7146 w
(soft\255) 4821 7146 w
(ware is designed to interoperate with implementations of either standard.\)) 720 7266 w
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10 /LucidaSansUnicode00 f
(\255 16 \255) 2752 480 w
(The) 720 840 w
(TLS) 937 840 w
(record) 1143 840 w
(layer) 1493 840 w
(protocol) 1763 840 w
(ensures) 2204 840 w
(message) 2620 840 w
(integrity) 3081 840 w
(and) 3523 840 w
(privacy) 3740 840 w
(through) 4120 840 w
(the) 4544 840 w
(use) 4736 840 w
(of) 4942 840 w
(message) 720 960 w
(digesting) 1184 960 w
(and) 1675 960 w
(encryption) 1895 960 w
(with) 2449 960 w
(shared) 2694 960 w
(secrets.) 3062 960 w
(We) 3509 960 w
(implement) 3690 960 w
(this) 4247 960 w
(service) 4465 960 w
(as) 4840 960 w
(a) 4985 960 w
(kernel) 720 1080 w
(device,) 1062 1080 w
(though) 1442 1080 w
(it) 1829 1080 w
(could) 1936 1080 w
(be) 2243 1080 w
(performed) 2403 1080 w
(at) 2955 1080 w
(slightly) 3088 1080 w
(higher) 3480 1080 w
(cost) 3833 1080 w
(by) 4074 1080 w
(invoking) 4230 1080 w
(a) 4686 1080 w
(sepa\255) 4782 1080 w
(rate program.) 720 1200 w
(The library interface to the TLS kernel device is:) 1453 1200 w
9 /LucidaTypewriter f
(int) 1008 1370 w
(pushtls\(int) 1268 1370 w
(fd,) 2048 1370 w
(char) 2308 1370 w
(*hashalg,) 2633 1370 w
(char) 1268 1480 w
(*cryptalg,) 1593 1480 w
(int) 2308 1480 w
(isclient,) 2568 1480 w
(char) 1268 1590 w
(*secret,) 1593 1590 w
(char) 2178 1590 w
(*dir\);) 2503 1590 w
10 /LucidaSansUnicode00 f
(Given) 720 1770 w
(a) 1025 1770 w
(file) 1114 1770 w
(descriptor,) 1299 1770 w
(the) 1858 1770 w
(names) 2047 1770 w
(of) 2398 1770 w
(message) 2530 1770 w
(digest) 2988 1770 w
(and) 3320 1770 w
(encryption) 3534 1770 w
(algorithms,) 4083 1770 w
(and) 4670 1770 w
(the) 4885 1770 w
(shared) 720 1890 w
(secret,) 1101 1890 w
10 /LucidaTypewriter f
(pushtls) 1478 1890 w
10 /LucidaSansUnicode00 f
(returns) 2035 1890 w
(a) 2438 1890 w
(new) 2546 1890 w
(file) 2794 1890 w
(descriptor) 2998 1890 w
(for) 3544 1890 w
(the) 3736 1890 w
(encrypted) 3943 1890 w
(connection.) 4476 1890 w
(\(The) 720 2010 w
(final) 981 2010 w
(argument) 1241 2010 w
10 /LucidaTypewriter f
(dir) 1757 2010 w
10 /LucidaSansUnicode00 f
(receives) 2021 2010 w
(the) 2461 2010 w
(name) 2664 2010 w
(of) 2978 2010 w
(the) 3124 2010 w
(directory) 3327 2010 w
(in) 3806 2010 w
(the) 3945 2010 w
(TLS) 4148 2010 w
(device) 4366 2010 w
(that) 4721 2010 w
(is) 4960 2010 w
(associated) 720 2130 w
(with) 1262 2130 w
(the) 1500 2130 w
(new connection.\)) 1688 2130 w
(The function is named by analogy with the ) 2576 2130 w
10 /LucidaSansUnicode20 f
(\030\030) 4674 2130 w
10 /LucidaSansUnicode00 f
(push) 4738 2130 w
10 /LucidaSansUnicode20 f
(\031\031) 4976 2130 w
10 /LucidaSansUnicode00 f
(operation) 720 2250 w
(supported) 1228 2250 w
(by) 1769 2250 w
(the) 1928 2250 w
(stream) 2127 2250 w
(I/O) 2504 2250 w
(system) 2708 2250 w
(of) 3092 2250 w
(Research) 3234 2250 w
(Unix) 3713 2250 w
(and) 3978 2250 w
(the) 4202 2250 w
(first) 4401 2250 w
(two) 4640 2250 w
(edi\255) 4859 2250 w
(tions) 720 2370 w
(of) 999 2370 w
(Plan) 1135 2370 w
(9.) 1374 2370 w
(Because) 1539 2370 w
(adding) 1966 2370 w
(encryption) 2338 2370 w
(is) 2890 2370 w
(as) 3008 2370 w
(simple) 3152 2370 w
(as) 3511 2370 w
(replacing) 3655 2370 w
(one) 4141 2370 w
(file) 4358 2370 w
(descriptor) 4547 2370 w
(with another, adding encryption to a particular network service is usually trivial.) 720 2490 w
(The Plan 9 shared key authentication protocols establish a shared 56-bit secret as) 720 2646 w
(a) 4753 2646 w
(side) 4841 2646 w
(effect.) 720 2766 w
(Native) 1093 2766 w
(Plan) 1431 2766 w
(9) 1667 2766 w
(network) 1765 2766 w
(services) 2191 2766 w
(such) 2612 2766 w
(as) 2872 2766 w
10 /LucidaTypewriter f
(cpu) 3012 2766 w
10 /LucidaSansUnicode00 f
(and) 3262 2766 w
10 /LucidaTypewriter f
(exportfs) 3476 2766 w
10 /LucidaSansUnicode00 f
(use) 4086 2766 w
(these) 4289 2766 w
(protocols) 4585 2766 w
(for authentication and then invoke) 720 2886 w
10 /LucidaTypewriter f
(pushtls) 2429 2886 w
10 /LucidaSansUnicode00 f
(with the shared secret.) 2965 2886 w
(Above) 720 3042 w
(the) 1062 3042 w
(record) 1258 3042 w
(layer,) 1612 3042 w
(TLS) 1918 3042 w
(specifies) 2129 3042 w
(a) 2593 3042 w
(handshake) 2689 3042 w
(protocol) 3254 3042 w
(using) 3699 3042 w
(public) 4007 3042 w
(keys) 4346 3042 w
(to) 4605 3042 w
(estab\255) 4745 3042 w
(lish) 720 3162 w
(the) 938 3162 w
(session) 1139 3162 w
(secret.) 1546 3162 w
(This) 1948 3162 w
(protocol) 2199 3162 w
(is) 2649 3162 w
(widely) 2775 3162 w
(used) 3127 3162 w
(with) 3405 3162 w
(HTTP) 3656 3162 w
(and) 3957 3162 w
(IMAP4) 4183 3162 w
(to) 4531 3162 w
(provide) 4675 3162 w
(server) 720 3282 w
(authentication,) 1054 3282 w
(though) 1818 3282 w
(with) 2201 3282 w
(client) 2444 3282 w
(certificates) 2746 3282 w
(it) 3314 3282 w
(could) 3418 3282 w
(provide) 3722 3282 w
(mutual) 4125 3282 w
(authentica\255) 4501 3282 w
(tion.) 720 3402 w
(The library function) 1005 3402 w
9 /LucidaTypewriter f
(int) 1008 3572 w
(tlsClient\(int) 1268 3572 w
(fd,) 2178 3572 w
(TLSconn) 2438 3572 w
(*conn\)) 2958 3572 w
10 /LucidaSansUnicode00 f
(handles) 720 3752 w
(the) 1133 3752 w
(initial) 1323 3752 w
(handshake) 1628 3752 w
(and) 2187 3752 w
(returns) 2402 3752 w
(the) 2788 3752 w
(result) 2979 3752 w
(of) 3291 3752 w
10 /LucidaTypewriter f
(pushtls) 3425 3752 w
10 /LucidaSansUnicode00 f
(.) 3929 3752 w
(On) 4029 3752 w
(return,) 4205 3752 w
(it) 4572 3752 w
(fills) 4674 3752 w
(the) 4885 3752 w
10 /LucidaTypewriter f
(conn) 720 3872 w
10 /LucidaSansUnicode00 f
(structure) 1061 3872 w
(with) 1552 3872 w
(the) 1810 3872 w
(session) 2018 3872 w
(ID) 2432 3872 w
(used) 2589 3872 w
(and) 2874 3872 w
(the) 3107 3872 w
(X.509) 3314 3872 w
(certificate) 3650 3872 w
(presented) 4181 3872 w
(by) 4718 3872 w
(the) 4885 3872 w
(server,) 720 3992 w
(but) 1086 3992 w
(makes) 1285 3992 w
(no) 1635 3992 w
(effort) 1795 3992 w
(to) 2101 3992 w
(verify) 2236 3992 w
(the) 2541 3992 w
(certificate.) 2734 3992 w
(Although) 3315 3992 w
(the) 3797 3992 w
(original) 3990 3992 w
(design) 4396 3992 w
(intent) 4757 3992 w
(of) 720 4112 w
(X.509) 858 4112 w
(certificates) 1181 4112 w
(expected) 1750 4112 w
(that) 2232 4112 w
(they) 2462 4112 w
(would) 2708 4112 w
(be) 3039 4112 w
(used) 3197 4112 w
(with) 3468 4112 w
(a) 3712 4112 w
(Public) 3806 4112 w
(Key) 4134 4112 w
(Infrastructure,) 4346 4112 w
(reliable deployment has been so) 720 4232 w
(long) 2328 4232 w
(delayed) 2575 4232 w
(and) 2982 4232 w
(problematic) 3195 4232 w
(that) 3806 4232 w
(we) 4030 4232 w
(have) 4196 4232 w
(adopted) 4454 4232 w
(the) 4885 4232 w
(simpler) 720 4352 w
(policy) 1125 4352 w
(of) 1453 4352 w
(just) 1594 4352 w
(using) 1817 4352 w
(the) 2126 4352 w
(X.509) 2324 4352 w
(certificate) 2651 4352 w
(as) 3172 4352 w
(a) 3320 4352 w
(representation) 3417 4352 w
(of) 4166 4352 w
(the) 4306 4352 w
(public) 4503 4352 w
(key,) 4842 4352 w
(depending) 720 4472 w
(on) 1287 4472 w
(a) 1461 4472 w
(locally-administered) 1567 4472 w
(directory) 2617 4472 w
(of) 3099 4472 w
(SHA1) 3248 4472 w
(thumbprints) 3559 4472 w
(to) 4210 4472 w
(allow) 4359 4472 w
(applica\255) 4662 4472 w
(tions to decide which public keys to trust for which purposes.) 720 4592 w
10 /LucidaSans-Demi f
(7.) 720 4832 w
(Related Work and Discussion) 873 4832 w
10 /LucidaSansUnicode00 f
(Kerberos,) 720 4988 w
(one) 1219 4988 w
(of) 1431 4988 w
(the) 1562 4988 w
(earliest) 1751 4988 w
(distributed) 2139 4988 w
(authentication) 2704 4988 w
(systems,) 3433 4988 w
(keeps) 3890 4988 w
(a) 4208 4988 w
(set) 4297 4988 w
(of) 4475 4988 w
(authenti\255) 4607 4988 w
(cation) 720 5108 w
(tickets) 1054 5108 w
(in) 1412 5108 w
(a) 1542 5108 w
(temporary) 1636 5108 w
(file) 2174 5108 w
(called) 2364 5108 w
(a) 2686 5108 w
(ticket) 2780 5108 w
(cache.) 3087 5108 w
(The) 3465 5108 w
(ticket) 3685 5108 w
(cache) 3991 5108 w
(is) 4304 5108 w
(protected) 4422 5108 w
(by) 4925 5108 w
(Unix) 720 5228 w
(file) 988 5228 w
(permissions.) 1186 5228 w
(An) 1884 5228 w
(environment) 2062 5228 w
(variable) 2721 5228 w
(containing) 3149 5228 w
(the) 3707 5228 w
(file) 3910 5228 w
(name) 4109 5228 w
(of) 4423 5228 w
(the) 4569 5228 w
(ticket) 4772 5228 w
(cache) 720 5348 w
(allows) 1032 5348 w
(for) 1371 5348 w
(different) 1547 5348 w
(ticket) 2002 5348 w
(caches) 2307 5348 w
(in) 2669 5348 w
(different) 2796 5348 w
(simultaneous) 3250 5348 w
(login) 3934 5348 w
(sessions.) 4213 5348 w
(A) 4725 5348 w
(user) 4830 5348 w
(logs) 720 5468 w
(in) 965 5468 w
(by) 1098 5468 w
(typing) 1255 5468 w
(his) 1602 5468 w
(or) 1786 5468 w
(her) 1930 5468 w
(Kerberos) 2131 5468 w
(password.) 2607 5468 w
(The) 3176 5468 w
(login) 3400 5468 w
(program) 3686 5468 w
(uses) 4145 5468 w
(the) 4408 5468 w
(Kerberos) 4606 5468 w
(password) 720 5588 w
(to) 1231 5588 w
(obtain) 1378 5588 w
(a) 1734 5588 w
(temporary) 1838 5588 w
(ticket-granting) 2385 5588 w
(ticket) 3169 5588 w
(from) 3485 5588 w
(the) 3765 5588 w
(authentication) 3968 5588 w
(server,) 4711 5588 w
(initializes) 720 5708 w
(the) 1234 5708 w
(ticket) 1440 5708 w
(cache) 1759 5708 w
(with) 2085 5708 w
(the) 2341 5708 w
(ticket-granting) 2547 5708 w
(ticket,) 3334 5708 w
(and) 3685 5708 w
(then) 3916 5708 w
(forgets) 4184 5708 w
(the) 4580 5708 w
(pass\255) 4787 5708 w
(word.) 720 5828 w
(Other) 1078 5828 w
(applications) 1404 5828 w
(can) 2041 5828 w
(use) 2261 5828 w
(the) 2482 5828 w
(ticket-granting) 2689 5828 w
(ticket) 3476 5828 w
(to) 3795 5828 w
(sign) 3944 5828 w
(tickets) 4199 5828 w
(for) 4569 5828 w
(them\255) 4759 5828 w
(selves) 720 5948 w
(on) 1049 5948 w
(behalf) 1206 5948 w
(of) 1542 5948 w
(the) 1674 5948 w
(user) 1863 5948 w
(during) 2107 5948 w
(the) 2460 5948 w
(login) 2649 5948 w
(session.) 2926 5948 w
(The) 3385 5948 w
(ticket) 3600 5948 w
(cache) 3902 5948 w
(is) 4211 5948 w
(removed) 4326 5948 w
(when) 4783 5948 w
(the) 720 6068 w
(user) 926 6068 w
(logs) 1187 6068 w
(out) 1441 6068 w
([Stei88]) 1652 6068 w
(The) 2071 6068 w
(ticket) 2303 6068 w
(cache) 2622 6068 w
(relieves) 2948 6068 w
(the) 3369 6068 w
(user) 3575 6068 w
(from) 3836 6068 w
(typing) 4118 6068 w
(a) 4473 6068 w
(password) 4578 6068 w
(every time authentication is needed.) 720 6188 w
(The) 720 6344 w
(secure) 956 6344 w
(shell) 1328 6344 w
(SSH) 1610 6344 w
(develops) 1847 6344 w
(this) 2333 6344 w
(idea) 2567 6344 w
(further,) 2825 6344 w
(replacing) 3248 6344 w
(the) 3751 6344 w
(temporary) 3962 6344 w
(file) 4517 6344 w
(with) 4724 6344 w
(a) 4985 6344 w
(named) 720 6464 w
(Unix) 1093 6464 w
(domain) 1358 6464 w
(socket) 1765 6464 w
(connected) 2123 6464 w
(to) 2665 6464 w
(a) 2806 6464 w
(user-level) 2904 6464 w
(program,) 3437 6464 w
(called) 3928 6464 w
(an) 4254 6464 w
(agent.) 4414 6464 w
(Once) 4793 6464 w
(the) 720 6584 w
(SSH) 917 6584 w
(agent) 1141 6584 w
(is) 1455 6584 w
(started) 1577 6584 w
(and) 1959 6584 w
(initialized) 2181 6584 w
(with) 2698 6584 w
(one) 2945 6584 w
(or) 3166 6584 w
(more) 3310 6584 w
(RSA) 3603 6584 w
(private) 3832 6584 w
(keys,) 4208 6584 w
(SSH) 4500 6584 w
(clients) 4725 6584 w
(can) 720 6704 w
(employ) 941 6704 w
(it) 1348 6704 w
(to) 1467 6704 w
(perform) 1618 6704 w
(RSA) 2063 6704 w
(authentications) 2302 6704 w
(on) 3101 6704 w
(their) 3277 6704 w
(behalf.) 3555 6704 w
(In) 3974 6704 w
(the) 4118 6704 w
(absence) 4326 6704 w
(of) 4773 6704 w
(an) 4923 6704 w
(agent,) 720 6824 w
(SSH) 1066 6824 w
(typically) 1290 6824 w
(uses) 1729 6824 w
(RSA) 1991 6824 w
(keys) 2220 6824 w
(read) 2480 6824 w
(from) 2738 6824 w
(encrypted) 3013 6824 w
(disk) 3537 6824 w
(files) 3781 6824 w
(or) 4026 6824 w
(uses) 4171 6824 w
(passphrase-) 4434 6824 w
(based) 720 6944 w
(authentication,) 1046 6944 w
(both) 1810 6944 w
(of) 2070 6944 w
(which) 2205 6944 w
(would) 2523 6944 w
(require) 2852 6944 w
(prompting) 3237 6944 w
(the) 3785 6944 w
(user) 3977 6944 w
(for) 4224 6944 w
(a) 4400 6944 w
(passphrase) 4492 6944 w
(whenever) 720 7064 w
(authentication) 1223 7064 w
(is) 1960 7064 w
(needed) 2082 7064 w
([Ylon96].) 2480 7064 w
(The) 2992 7064 w
(self-certifying) 3215 7064 w
(file) 3944 7064 w
(system) 4137 7064 w
(SFS) 4519 7064 w
(uses) 4723 7064 w
(a) 4985 7064 w
(similar) 720 7184 w
(agent) 1081 7184 w
([Kami00],) 1387 7184 w
(not) 1887 7184 w
(only) 2081 7184 w
(for) 2318 7184 w
(moderating) 2490 7184 w
(the) 3082 7184 w
(use) 3270 7184 w
(of) 3472 7184 w
(client) 3603 7184 w
(authentication) 3900 7184 w
(keys) 4628 7184 w
(but) 4878 7184 w
(also for verifying server public keys [Mazi99].) 720 7304 w
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17 pagesetup
10 /LucidaSansUnicode00 f
(\255 17 \255) 2752 480 w
10 /LucidaTypewriter f
(Factotum) 720 840 w
10 /LucidaSansUnicode00 f
(is) 1344 840 w
(a) 1472 840 w
(logical) 1575 840 w
(continuation) 1939 840 w
(of) 2595 840 w
(this) 2741 840 w
(evolution,) 2968 840 w
(replacing) 3498 840 w
(the) 3995 840 w
(program-specific) 4199 840 w
(SSH) 720 960 w
(or) 945 960 w
(SFS) 1090 960 w
(agents) 1295 960 w
(with) 1661 960 w
(a) 1909 960 w
(general) 2007 960 w
(agent) 2410 960 w
(capable) 2724 960 w
(of) 3138 960 w
(serving) 3278 960 w
(a) 3673 960 w
(wide) 3770 960 w
(variety) 4037 960 w
(of) 4401 960 w
(programs.) 4541 960 w
(Having) 720 1080 w
(one) 1099 1080 w
(agent) 1323 1080 w
(for) 1640 1080 w
(all) 1824 1080 w
(programs) 1982 1080 w
(removes) 2494 1080 w
(the) 2949 1080 w
(need) 3149 1080 w
(to) 3431 1080 w
(have) 3574 1080 w
(one) 3844 1080 w
(agent) 4069 1080 w
(for) 4387 1080 w
(each) 4572 1080 w
(pro\255) 4842 1080 w
(gram.) 720 1200 w
(It) 1092 1200 w
(also) 1215 1200 w
(allows) 1468 1200 w
(the) 1827 1200 w
(programs) 2039 1200 w
(themselves) 2563 1200 w
(to) 3163 1200 w
(be) 3318 1200 w
(protocol-agnostic,) 3494 1200 w
(so) 4453 1200 w
(that,) 4622 1200 w
(for) 4901 1200 w
(example,) 720 1320 w
(one) 1203 1320 w
(could) 1420 1320 w
(build) 1724 1320 w
(an) 2008 1320 w
(SSH) 2163 1320 w
(workalike) 2383 1320 w
(capable) 2885 1320 w
(of) 3296 1320 w
(using) 3433 1320 w
(any) 3738 1320 w
(protocol) 3946 1320 w
(supported) 4389 1320 w
(by) 4925 1320 w
10 /LucidaTypewriter f
(factotum) 720 1440 w
10 /LucidaSansUnicode00 f
(,) 1296 1440 w
(without) 1367 1440 w
(that) 1771 1440 w
(program) 2001 1440 w
(knowing) 2456 1440 w
(anything) 2906 1440 w
(about) 3366 1440 w
(the) 3683 1440 w
(protocols.) 3877 1440 w
(Traditionally) 4435 1440 w
(each program needs to) 720 1560 w
(implement) 1875 1560 w
(each) 2426 1560 w
(authentication) 2683 1560 w
(protocol) 3411 1560 w
(for) 3848 1560 w
(itself,) 4020 1560 w
(an) 4324 1560 w
11 /LucidaSans-Italic f
(O) 4474 1560 w
11 /LucidaSansUnicode00 f
(\() 4569 1560 w
11 /LucidaSans-Italic f
(n) 4614 1560 w
8 /LucidaSansUnicode00 f
(2) 4695 1516 w
11 /LucidaSansUnicode00 f
(\)) 4763 1560 w
10 /LucidaSansUnicode00 f
(cod\255) 4832 1560 w
(ing problem that reduces to an) 720 1680 w
11 /LucidaSans-Italic f
(O) 2257 1680 w
11 /LucidaSansUnicode00 f
(\() 2352 1680 w
11 /LucidaSans-Italic f
(n) 2397 1680 w
11 /LucidaSansUnicode00 f
(\)) 2474 1680 w
10 /LucidaSansUnicode00 f
(coding problem with) 2542 1680 w
10 /LucidaTypewriter f
(factotum) 3577 1680 w
10 /LucidaSansUnicode00 f
(.) 4153 1680 w
(Previous) 720 1836 w
(work) 1184 1836 w
(on) 1478 1836 w
(agents) 1658 1836 w
(has) 2038 1836 w
(concentrated) 2263 1836 w
(on) 2952 1836 w
(their) 3132 1836 w
(use) 3415 1836 w
(by) 3642 1836 w
(clients) 3815 1836 w
(authenticating) 4188 1836 w
(to) 4942 1836 w
(servers.) 720 1956 w
(Looking) 1169 1956 w
(in) 1592 1956 w
(the) 1720 1956 w
(other) 1912 1956 w
(direction,) 2206 1956 w
(Sun) 2704 1956 w
(Microsystem) 2919 1956 w
10 /LucidaSansUnicode20 f
(\031) 3527 1956 w
10 /LucidaSansUnicode00 f
(s) 3559 1956 w
(system) 3646 1956 w
(of) 4022 1956 w
(pluggable) 4156 1956 w
(authen\255) 4673 1956 w
(tication) 720 2076 w
(modules) 1123 2076 w
(\(PAM\)) 1580 2076 w
(is) 1898 2076 w
(one) 2020 2076 w
(of) 2242 2076 w
(the) 2383 2076 w
(earliest) 2581 2076 w
(attempts) 2978 2076 w
(to) 3450 2076 w
(provide) 3591 2076 w
(a) 3999 2076 w
(general) 4097 2076 w
(authentica\255) 4501 2076 w
(tion) 720 2196 w
(mechanism) 952 2196 w
(for) 1547 2196 w
(Unix-like) 1729 2196 w
(operating) 2222 2196 w
(systems) 2730 2196 w
([Sama96].) 3163 2196 w
(Without) 3718 2196 w
(a) 4134 2196 w
(central) 4231 2196 w
(authority) 4604 2196 w
(like) 720 2316 w
(PAM,) 936 2316 w
(system) 1222 2316 w
(policy) 1606 2316 w
(is) 1935 2316 w
(tied) 2059 2316 w
(up) 2288 2316 w
(in) 2457 2316 w
(the) 2592 2316 w
(various) 2791 2316 w
(implementations) 3186 2316 w
(of) 4043 2316 w
(network) 4185 2316 w
(services.) 4621 2316 w
(For) 720 2436 w
(example,) 916 2436 w
(on) 1401 2436 w
(a) 1564 2436 w
(typical) 1659 2436 w
(Unix,) 2014 2436 w
(if) 2306 2436 w
(a) 2411 2436 w
(system) 2505 2436 w
(administrator) 2884 2436 w
(decides) 3577 2436 w
(not) 3985 2436 w
(to) 4184 2436 w
(allow) 4321 2436 w
(plaintext) 4611 2436 w
(passwords for authentication, the) 720 2556 w
(configuration) 2383 2556 w
(files) 3065 2556 w
(for) 3300 2556 w
(a) 3472 2556 w
(half) 3560 2556 w
(dozen) 3776 2556 w
(different) 4108 2556 w
(servers) 4559 2556 w
10 /LucidaSansUnicode20 f
(\024) 4940 2556 w
10 /LucidaTypewriter f
(rlogind) 720 2676 w
10 /LucidaSansUnicode00 f
(,) 1224 2676 w
10 /LucidaTypewriter f
(telnetd) 1298 2676 w
10 /LucidaSansUnicode00 f
(,) 1802 2676 w
10 /LucidaTypewriter f
(ftpd) 1876 2676 w
10 /LucidaSansUnicode00 f
(,) 2164 2676 w
10 /LucidaTypewriter f
(sshd) 2238 2676 w
10 /LucidaSansUnicode00 f
(,) 2526 2676 w
(and) 2600 2676 w
(so) 2822 2676 w
(on) 2976 2676 w
10 /LucidaSansUnicode20 f
(\024) 3141 2676 w
10 /LucidaSansUnicode00 f
(need) 3283 2676 w
(to) 3561 2676 w
(be) 3700 2676 w
(edited.) 3860 2676 w
(PAM) 4269 2676 w
(solves) 4520 2676 w
(this) 4861 2676 w
(problem) 720 2796 w
(by) 1171 2796 w
(hiding) 1331 2796 w
(the) 1683 2796 w
(details) 1883 2796 w
(of) 2248 2796 w
(a) 2391 2796 w
(given) 2491 2796 w
(authentication) 2798 2796 w
(mechanism) 3539 2796 w
(behind) 4137 2796 w
(a) 4518 2796 w
(common) 4619 2796 w
(library) 720 2916 w
(interface.) 1072 2916 w
(Directed) 1601 2916 w
(by) 2050 2916 w
(a) 2206 2916 w
(system-wide) 2302 2916 w
(configuration) 2966 2916 w
(file,) 3656 2916 w
(an) 3880 2916 w
(application) 4038 2916 w
(selects) 4613 2916 w
(a) 4985 2916 w
(particular) 720 3036 w
(authentication) 1247 3036 w
(mechanism) 2006 3036 w
(by) 2622 3036 w
(dynamically) 2802 3036 w
(loading) 3437 3036 w
(the) 3863 3036 w
(appropriate) 4083 3036 w
(shared) 4712 3036 w
(library.) 720 3156 w
(PAM is widely used on Sun) 1126 3156 w
10 /LucidaSansUnicode20 f
(\031) 2415 3156 w
10 /LucidaSansUnicode00 f
(s Solaris and some Linux distributions.) 2447 3156 w
10 /LucidaTypewriter f
(Factotum) 720 3312 w
10 /LucidaSansUnicode00 f
(achieves) 1332 3312 w
(the) 1780 3312 w
(same) 1971 3312 w
(goals) 2263 3312 w
(using) 2558 3312 w
(the) 2861 3312 w
(agent) 3053 3312 w
(approach.) 3362 3312 w
10 /LucidaTypewriter f
(Factotum) 3914 3312 w
10 /LucidaSansUnicode00 f
(is) 4527 3312 w
(the) 4644 3312 w
(only) 4836 3312 w
(process) 720 3432 w
(that) 1128 3432 w
(needs) 1353 3432 w
(to) 1674 3432 w
(create) 1805 3432 w
(capabilities,) 2134 3432 w
(so) 2746 3432 w
(all) 2891 3432 w
(the) 3037 3432 w
(network) 3225 3432 w
(servers) 3650 3432 w
(can) 4031 3432 w
(run) 4232 3432 w
(as) 4430 3432 w
(untrusted) 4569 3432 w
(users) 720 3552 w
(\(e.g.,) 1015 3552 w
(Plan) 1296 3552 w
(9) 1531 3552 w
10 /LucidaSansUnicode20 f
(\031) 1594 3552 w
10 /LucidaSansUnicode00 f
(s) 1626 3552 w
10 /LucidaTypewriter f
(none) 1711 3552 w
10 /LucidaSansUnicode00 f
(or) 2033 3552 w
(Unix) 2169 3552 w
10 /LucidaSansUnicode20 f
(\031) 2390 3552 w
10 /LucidaSansUnicode00 f
(s) 2422 3552 w
10 /LucidaTypewriter f
(nobody) 2507 3552 w
10 /LucidaSansUnicode00 f
(\),) 2939 3552 w
(which) 3038 3552 w
(greatly) 3353 3552 w
(reduces) 3719 3552 w
(the) 4133 3552 w
(harm) 4322 3552 w
(done) 4607 3552 w
(if) 4884 3552 w
(a) 4985 3552 w
(server) 720 3672 w
(is) 1056 3672 w
(buggy) 1175 3672 w
(and) 1515 3672 w
(is) 1734 3672 w
(compromised.) 1853 3672 w
(In) 2618 3672 w
(fact,) 2747 3672 w
(if) 2997 3672 w
10 /LucidaTypewriter f
(factotum) 3101 3672 w
10 /LucidaSansUnicode00 f
(were) 3715 3672 w
(implemented) 3983 3672 w
(on) 4658 3672 w
(Unix) 4819 3672 w
(along) 720 3792 w
(with) 1027 3792 w
(an) 1270 3792 w
(analogue) 1425 3792 w
(to) 1905 3792 w
(the) 2041 3792 w
(Plan) 2234 3792 w
(9) 2473 3792 w
(capability) 2574 3792 w
(device,) 3075 3792 w
(venerable) 3452 3792 w
(programs) 3960 3792 w
(like) 4466 3792 w
10 /LucidaTypewriter f
(su) 4677 3792 w
10 /LucidaSansUnicode00 f
(and) 4860 3792 w
10 /LucidaTypewriter f
(login) 720 3912 w
10 /LucidaSansUnicode00 f
(would no longer need to be installed ) 1112 3912 w
10 /LucidaSansUnicode20 f
(\030\030) 2927 3912 w
10 /LucidaSansUnicode00 f
(setuid root.) 2991 3912 w
10 /LucidaSansUnicode20 f
(\031\031) 3553 3912 w
10 /LucidaSansUnicode00 f
(Several) 720 4068 w
(other) 1114 4068 w
(systems,) 1422 4068 w
(such) 1896 4068 w
(as) 2173 4068 w
(Password) 2330 4068 w
(Safe) 2835 4068 w
([Schn],) 3088 4068 w
(store) 3467 4068 w
(multiple) 3765 4068 w
(passwords) 4215 4068 w
(in) 4780 4068 w
(an) 4923 4068 w
(encrypted) 720 4188 w
(file,) 1235 4188 w
(so) 1452 4188 w
(that) 1598 4188 w
(the) 1823 4188 w
(user) 2012 4188 w
(only) 2256 4188 w
(needs) 2494 4188 w
(to) 2816 4188 w
(remember) 2947 4188 w
(one) 3479 4188 w
(password.) 3691 4188 w
(Our) 4250 4188 w
10 /LucidaTypewriter f
(secstore) 4464 4188 w
10 /LucidaSansUnicode00 f
(solution) 720 4308 w
(differs) 1146 4308 w
(from) 1494 4308 w
(these) 1760 4308 w
(by) 2056 4308 w
(placing) 2205 4308 w
(the) 2590 4308 w
(storage) 2779 4308 w
(in) 3176 4308 w
(a) 3301 4308 w
(hardened) 3390 4308 w
(location) 3882 4308 w
(in) 4301 4308 w
(the) 4426 4308 w
(network,) 4616 4308 w
(so) 720 4428 w
(that) 875 4428 w
(the) 1109 4428 w
(encrypted) 1306 4428 w
(file) 1829 4428 w
(is) 2022 4428 w
(less) 2144 4428 w
(liable) 2373 4428 w
(to) 2676 4428 w
(be) 2816 4428 w
(stolen) 2977 4428 w
(for) 3315 4428 w
(offline) 3496 4428 w
(dictionary) 3849 4428 w
(attack) 4371 4428 w
(and) 4706 4428 w
(so) 4928 4428 w
(that) 720 4548 w
(it) 962 4548 w
(is) 1079 4548 w
(available) 1210 4548 w
(even) 1684 4548 w
(when) 1961 4548 w
(a) 2269 4548 w
(user) 2376 4548 w
(has) 2638 4548 w
(several) 2858 4548 w
(computers.) 3250 4548 w
(In) 3881 4548 w
(contrast,) 4024 4548 w
(Microsoft) 4503 4548 w
10 /LucidaSansUnicode20 f
(\031) 4957 4548 w
10 /LucidaSansUnicode00 f
(s) 4989 4548 w
(Passport) 720 4668 w
(system) 1211 4668 w
([Micr]) 1628 4668 w
(keeps) 1978 4668 w
(credentials) 2339 4668 w
(in) 2945 4668 w
(the) 3112 4668 w
(network,) 3343 4668 w
(but) 3843 4668 w
(centralized) 4081 4668 w
(at) 4693 4668 w
(one) 4861 4668 w
(extremely-high-value) 720 4788 w
(target.) 1831 4788 w
(The) 2228 4788 w
(important) 2454 4788 w
(feature) 2977 4788 w
(of) 3366 4788 w
(Passport,) 3509 4788 w
(setting) 4001 4788 w
(up) 4381 4788 w
(trust) 4552 4788 w
(rela\255) 4826 4788 w
(tionships) 720 4908 w
(with) 1231 4908 w
(e-merchants,) 1502 4908 w
(is) 2221 4908 w
(outside) 2366 4908 w
(our) 2790 4908 w
(scope.) 3019 4908 w
(The) 3430 4908 w
10 /LucidaTypewriter f
(secstore) 3676 4908 w
10 /LucidaSansUnicode00 f
(architecture) 4317 4908 w
(is) 4960 4908 w
(almost) 720 5028 w
(identical) 1079 5028 w
(to) 1523 5028 w
(Perlman) 1654 5028 w
(and) 2078 5028 w
(Kaufman) 2292 5028 w
10 /LucidaSansUnicode20 f
(\031) 2721 5028 w
10 /LucidaSansUnicode00 f
(s) 2753 5028 w
([Perl99]) 2838 5028 w
(but) 3245 5028 w
(with) 3441 5028 w
(newer) 3680 5028 w
(EKE) 4006 5028 w
(technology.) 4213 5028 w
(Like) 4844 5028 w
(them,) 720 5148 w
(we) 1045 5148 w
(chose) 1223 5148 w
(to) 1549 5148 w
(defend) 1692 5148 w
(mainly) 2074 5148 w
(against) 2439 5148 w
(outside) 2835 5148 w
(attacks) 3239 5148 w
(on) 3628 5148 w
10 /LucidaTypewriter f
(secstore) 3795 5148 w
10 /LucidaSansUnicode00 f
(;) 4371 5148 w
(if) 4447 5148 w
(additional) 4557 5148 w
(defense) 720 5268 w
(of) 1145 5268 w
(the) 1287 5268 w
(files) 1486 5268 w
(on) 1732 5268 w
(the) 1899 5268 w
(server) 2098 5268 w
(itself) 2439 5268 w
(is) 2723 5268 w
(desired,) 2848 5268 w
(one) 3284 5268 w
(can) 3508 5268 w
(use) 3721 5268 w
(distributed) 3935 5268 w
(techniques) 4511 5268 w
([Ford00].) 720 5388 w
(We) 720 5544 w
(made) 899 5544 w
(a) 1203 5544 w
(conscious) 1295 5544 w
(choice) 1811 5544 w
(of) 2158 5544 w
(placing) 2293 5544 w
(encryption,) 2681 5544 w
(message) 3265 5544 w
(integrity,) 3727 5544 w
(and) 4202 5544 w
(key) 4420 5544 w
(manage\255) 4624 5544 w
(ment) 720 5664 w
(at) 1005 5664 w
(the) 1134 5664 w
(application) 1326 5664 w
(layer) 1897 5664 w
(\(TLS,) 2167 5664 w
(just) 2439 5664 w
(above) 2656 5664 w
(layer) 2980 5664 w
(4\)) 3250 5664 w
(rather) 3383 5664 w
(than) 3712 5664 w
(at) 3965 5664 w
(layer) 4094 5664 w
(3,) 4364 5664 w
(as) 4496 5664 w
(in) 4639 5664 w
(IPsec.) 4766 5664 w
(This) 720 5784 w
(leads) 966 5784 w
(to) 1261 5784 w
(a) 1400 5784 w
(simpler) 1496 5784 w
(structure) 1899 5784 w
(for) 2378 5784 w
(the) 2558 5784 w
(network) 2754 5784 w
(stack,) 3187 5784 w
(easier) 3512 5784 w
(integration) 3842 5784 w
(with) 4415 5784 w
(applica\255) 4662 5784 w
(tions) 720 5904 w
(and,) 999 5904 w
(most) 1250 5904 w
(important,) 1531 5904 w
(easier) 2080 5904 w
(network) 2407 5904 w
(administration) 2838 5904 w
(since) 3581 5904 w
(we) 3869 5904 w
(can) 4040 5904 w
(recognize) 4246 5904 w
(which) 4759 5904 w
(applications) 720 6024 w
(are) 1347 6024 w
(misbehaving) 1541 6024 w
(based) 2197 6024 w
(on) 2527 6024 w
(TCP) 2692 6024 w
(port) 2921 6024 w
(numbers.) 3165 6024 w
(TLS) 3699 6024 w
(does) 3911 6024 w
(suffer) 4184 6024 w
(\(relative) 4511 6024 w
(to) 4942 6024 w
(IPsec\)) 720 6144 w
(from) 1034 6144 w
(the) 1305 6144 w
(possibility) 1499 6144 w
(of) 2031 6144 w
(forged) 2167 6144 w
(TCP) 2525 6144 w
(Reset,) 2750 6144 w
(but) 3083 6144 w
(we) 3283 6144 w
(feel) 3454 6144 w
(that) 3670 6144 w
(this) 3899 6144 w
(is) 4116 6144 w
(adequately) 4234 6144 w
(dealt) 4800 6144 w
(with by randomized TCP sequence numbers.) 720 6264 w
(Writing) 720 6420 w
(safe) 1114 6420 w
(code) 1361 6420 w
(is) 1640 6420 w
(difficult.) 1768 6420 w
(Stack) 2254 6420 w
(attacks,) 2557 6420 w
(mistakes) 2981 6420 w
(in) 3459 6420 w
(logic,) 3598 6420 w
(and) 3910 6420 w
(bugs) 4139 6420 w
(in) 4426 6420 w
(compilers) 4566 6420 w
(and) 720 6540 w
(operating) 934 6540 w
(systems) 1434 6540 w
(can) 1859 6540 w
(each) 2061 6540 w
(make) 2319 6540 w
(it) 2615 6540 w
(possible) 2715 6540 w
(for) 3152 6540 w
(an) 3325 6540 w
(attacker) 3475 6540 w
(to) 3898 6540 w
(subvert) 4029 6540 w
(the) 4424 6540 w
(intended) 4612 6540 w
(execution) 720 6660 w
(sequence) 1235 6660 w
(of) 1733 6660 w
(a) 1872 6660 w
(service.) 1968 6660 w
(If) 2409 6660 w
(the) 2516 6660 w
(server) 2712 6660 w
(process) 3050 6660 w
(has) 3465 6660 w
(the) 3674 6660 w
(privileges) 3870 6660 w
(of) 4379 6660 w
(a) 4518 6660 w
(powerful) 4614 6660 w
(user,) 720 6780 w
(such) 1004 6780 w
(as) 1272 6780 w
10 /LucidaTypewriter f
(root) 1419 6780 w
10 /LucidaSansUnicode00 f
(on) 1748 6780 w
(Unix,) 1912 6780 w
(then) 2206 6780 w
(so) 2464 6780 w
(does) 2617 6780 w
(the) 2889 6780 w
(attacker.) 3085 6780 w
10 /LucidaTypewriter f
(Factotum) 3580 6780 w
10 /LucidaSansUnicode00 f
(allows) 4197 6780 w
(us) 4540 6780 w
(to) 4694 6780 w
(con\255) 4833 6780 w
(strain) 720 6900 w
(the) 1029 6900 w
(privileged) 1218 6900 w
(execution) 1732 6900 w
(to) 2241 6900 w
(a) 2373 6900 w
(single) 2463 6900 w
(process) 2787 6900 w
(whose) 3196 6900 w
(core) 3538 6900 w
(is) 3782 6900 w
(a) 3897 6900 w
(few) 3987 6900 w
(thousand) 4192 6900 w
(lines) 4680 6900 w
(of) 4942 6900 w
(code.) 720 7020 w
(Verifying) 1064 7020 w
(such) 1546 7020 w
(a) 1821 7020 w
(process,) 1925 7020 w
(both) 2380 7020 w
(through) 2652 7020 w
(manual) 3087 7020 w
(and) 3491 7020 w
(automatic) 3719 7020 w
(means,) 4247 7020 w
(is) 4644 7020 w
(much) 4772 7020 w
(easier and less error prone than requiring it of all servers.) 720 7140 w
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18 pagesetup
10 /LucidaSansUnicode00 f
(\255 18 \255) 2752 480 w
10 /LucidaSans-Demi f
(Acknowledgments) 720 840 w
10 /LucidaSansUnicode00 f
(William) 720 996 w
(Josephson) 1158 996 w
(contributed) 1744 996 w
(to) 2395 996 w
(the) 2582 996 w
(implementation) 2826 996 w
(of) 3677 996 w
(password) 3864 996 w
(changing) 4415 996 w
(in) 4949 996 w
10 /LucidaTypewriter f
(secstore) 720 1116 w
10 /LucidaSansUnicode00 f
(.) 1296 1116 w
(We) 1399 1116 w
(thank) 1580 1116 w
(Phil) 1893 1116 w
(MacKenzie) 2107 1116 w
(and) 2663 1116 w
(Mart\355n) 2882 1116 w
(Abadi) 3231 1116 w
(for) 3549 1116 w
(helpful) 3727 1116 w
(comments) 4104 1116 w
(on) 4646 1116 w
(early) 4807 1116 w
(parts) 720 1236 w
(of) 1017 1236 w
(the) 1165 1236 w
(design.) 1370 1236 w
(Chuck) 1807 1236 w
(Blake,) 2159 1236 w
(Peter) 2497 1236 w
(Bosch,) 2792 1236 w
(Frans) 3157 1236 w
(Kaashoek,) 3470 1236 w
(Sape) 4015 1236 w
(Mullender,) 4293 1236 w
(and) 4860 1236 w
(Lakshman Y. N., predominantly Dutchmen, gave helpful comments on the paper.) 720 1356 w
10 /LucidaSans-Demi f
(References) 720 1596 w
10 /LucidaSansUnicode00 f
([Bell93]) 720 1752 w
(S.M.) 1130 1752 w
(Bellovin) 1380 1752 w
(and) 1803 1752 w
(M.) 2030 1752 w
(Merritt,) 2195 1752 w
10 /LucidaSansUnicode20 f
(\030\030) 2601 1752 w
10 /LucidaSansUnicode00 f
(Augmented) 2665 1752 w
(Encrypted) 3272 1752 w
(Key) 3798 1752 w
(Exchange,) 4018 1752 w
10 /LucidaSansUnicode20 f
(\031\031) 4513 1752 w
10 /LucidaSansUnicode00 f
(Proceed\255) 4624 1752 w
(ings) 720 1872 w
(of) 964 1872 w
(the) 1102 1872 w
(1st) 1297 1872 w
(ACM) 1488 1872 w
(Conference) 1752 1872 w
(on) 2343 1872 w
(Computer) 2506 1872 w
(and) 3028 1872 w
(Communications) 3248 1872 w
(Security) 4103 1872 w
(\(1993\)) 4525 1872 w
(pp.) 4882 1872 w
(244 - 250.) 720 1992 w
([Boyk00]) 720 2148 w
(Victor) 1184 2148 w
(Boyko,) 1511 2148 w
(Philip) 1876 2148 w
(MacKenzie,) 2186 2148 w
(and) 2778 2148 w
(Sarvar) 3001 2148 w
(Patel,) 3342 2148 w
10 /LucidaSansUnicode20 f
(\030\030) 3649 2148 w
10 /LucidaSansUnicode00 f
(Provably) 3713 2148 w
(Secure) 4164 2148 w
(Password-) 4528 2148 w
(Authenticated Key Exchange using Diffie-Hellman,) 720 2268 w
10 /LucidaSansUnicode20 f
(\031\031) 3177 2268 w
10 /LucidaSansUnicode00 f
(Eurocrypt 2000, 156) 3273 2268 w
10 /LucidaSansUnicode20 f
(\023) 4272 2268 w
10 /LucidaSansUnicode00 f
(171.) 4322 2268 w
([RFC2246] T . Dierks and C. Allen, ) 720 2424 w
10 /LucidaSansUnicode20 f
(\030\030) 2411 2424 w
10 /LucidaSansUnicode00 f
(The TLS Protocol, Version 1.0,) 2475 2424 w
10 /LucidaSansUnicode20 f
(\031\031) 3937 2424 w
10 /LucidaSansUnicode00 f
(RFC 2246.) 4033 2424 w
([Ford00] Warwick Ford and Burton) 720 2580 w
(S.) 2409 2580 w
(Kaliski,) 2528 2580 w
(Jr.,) 2909 2580 w
10 /LucidaSansUnicode20 f
(\030\030) 3078 2580 w
10 /LucidaSansUnicode00 f
(Server-Assisted) 3142 2580 w
(Generation) 3940 2580 w
(of) 4504 2580 w
(a) 4635 2580 w
(Strong) 4723 2580 w
(Secret) 720 2700 w
(from) 1081 2700 w
(a) 1379 2700 w
(Password,) 1500 2700 w
10 /LucidaSansUnicode20 f
(\031\031) 1986 2700 w
10 /LucidaSansUnicode00 f
(IEEE) 2115 2700 w
(Fifth) 2371 2700 w
(International) 2655 2700 w
(Workshop) 3335 2700 w
(on) 3883 2700 w
(Enterprise) 4071 2700 w
(Security,) 4626 2700 w
(National) 720 2820 w
(Institute) 1164 2820 w
(of) 1606 2820 w
(Standards) 1746 2820 w
(and) 2269 2820 w
(Technology) 2491 2820 w
(\(NIST\),) 3092 2820 w
(Gaithersburg) 3452 2820 w
(MD,) 4125 2820 w
(June) 4360 2820 w
(14) 4613 2820 w
(-) 4781 2820 w
(16,) 4882 2820 w
(2000.) 720 2940 w
([Jabl]) 720 3096 w
(David) 1071 3096 w
(P.) 1452 3096 w
(Jablon,) 1646 3096 w
10 /LucidaSansUnicode20 f
(\030\030) 2086 3096 w
10 /LucidaSansUnicode00 f
(Strong) 2150 3096 w
(Password-Only) 2575 3096 w
(Authenticated) 3416 3096 w
(Key) 4200 3096 w
(Exchange,) 4481 3096 w
10 /LucidaSansUnicode20 f
(\031\031) 4976 3096 w
10 /LucidaTypewriter f
(http://www.integritysciences.com/speke97.html) 720 3216 w
10 /LucidaSansUnicode00 f
(.) 3960 3216 w
([Kami00] Michael Kaminsky.) 720 3372 w
10 /LucidaSansUnicode20 f
(\030\030) 2148 3372 w
10 /LucidaSansUnicode00 f
(Flexible) 2212 3372 w
(Key) 2622 3372 w
(Management) 2828 3372 w
(with) 3485 3372 w
(SFS) 3723 3372 w
(Agents,) 3918 3372 w
10 /LucidaSansUnicode20 f
(\031\031) 4287 3372 w
10 /LucidaSansUnicode00 f
(Master) 4384 3372 w
10 /LucidaSansUnicode20 f
(\031) 4710 3372 w
10 /LucidaSansUnicode00 f
(s) 4742 3372 w
(The\255) 4826 3372 w
(sis, MIT, May 2000.) 720 3492 w
([Mack] Philip MacKenzie, private communication.) 720 3648 w
([Mazi99]) 720 3804 w
(David) 1191 3804 w
(Mazi\350res,) 1517 3804 w
(Michael) 2032 3804 w
(Kaminsky,) 2452 3804 w
(M.) 3001 3804 w
(Frans) 3171 3804 w
(Kaashoek) 3486 3804 w
(and) 4002 3804 w
(Emmett) 4235 3804 w
(Witchel,) 4658 3804 w
10 /LucidaSansUnicode20 f
(\030\030) 720 3924 w
10 /LucidaSansUnicode00 f
(Separating) 784 3924 w
(key) 1338 3924 w
(management) 1544 3924 w
(from) 2215 3924 w
(file) 2486 3924 w
(system) 2676 3924 w
(security,) 3055 3924 w
10 /LucidaSansUnicode20 f
(\031\031) 3466 3924 w
10 /LucidaSansUnicode00 f
(Symposium) 3569 3924 w
(on) 4166 3924 w
(Operating) 4328 3924 w
(Sys\255) 4850 3924 w
(tems Principles, 1999, pp. 124-139.) 720 4044 w
([Micr]) 720 4200 w
(Microsoft) 1212 4200 w
(Passport,) 1886 4200 w
10 /LucidaTypewriter f
(http://www.passport.com/Consumer/\255) 2592 4200 w
(PrivacyPolicy.asp) 720 4320 w
10 /LucidaSansUnicode00 f
(.) 1944 4320 w
([Perl99]) 720 4476 w
(Radia) 1159 4476 w
(Perlman) 1490 4476 w
(and) 1947 4476 w
(Charlie) 2193 4476 w
(Kaufman,) 2600 4476 w
10 /LucidaSansUnicode20 f
(\030\030) 3127 4476 w
10 /LucidaSansUnicode00 f
(Secure) 3191 4476 w
(Password-Based) 3577 4476 w
(Protocol) 4438 4476 w
(for) 4901 4476 w
(Downloading) 720 4596 w
(a) 1398 4596 w
(Private) 1495 4596 w
(Key,) 1862 4596 w
10 /LucidaSansUnicode20 f
(\031\031) 2067 4596 w
10 /LucidaSansUnicode00 f
(Proc.) 2173 4596 w
(1999) 2455 4596 w
(Network) 2749 4596 w
(and) 3195 4596 w
(Distributed) 3417 4596 w
(System) 4001 4596 w
(Security) 4385 4596 w
(Sym\255) 4808 4596 w
(posium, Internet Society, January 1999.) 720 4716 w
([Pike95]) 720 4872 w
(Rob) 1144 4872 w
(Pike,) 1365 4872 w
(Dave) 1629 4872 w
(Presotto,) 1901 4872 w
(Sean) 2366 4872 w
(Dorward,) 2627 4872 w
(Bob) 3107 4872 w
(Flandrena,) 3324 4872 w
(Ken) 3868 4872 w
(Thompson,) 4086 4872 w
(Howard) 4669 4872 w
(Trickey,) 720 4992 w
(and) 1136 4992 w
(Phil) 1350 4992 w
(Winterbottom,) 1559 4992 w
10 /LucidaSansUnicode20 f
(\030\030) 2288 4992 w
10 /LucidaSansUnicode00 f
(Plan) 2352 4992 w
(9) 2587 4992 w
(from) 2684 4992 w
(Bell) 2950 4992 w
(Labs,) 3156 4992 w
10 /LucidaSansUnicode20 f
(\031\031) 3410 4992 w
10 /LucidaSansUnicode00 f
(Computing) 3508 4992 w
(Systems,) 4080 4992 w
10 /LucidaSans-Demi f
(8) 4540 4992 w
10 /LucidaSansUnicode00 f
(,) 4604 4992 w
(3,) 4670 4992 w
(Sum\255) 4798 4992 w
(mer 1995, pp. 221-254.) 720 5112 w
([Pike93]) 720 5268 w
(Rob) 1159 5268 w
(Pike,) 1395 5268 w
(Dave) 1674 5268 w
(Presotto,) 1961 5268 w
(Ken) 2441 5268 w
(Thompson,) 2673 5268 w
(Howard) 3270 5268 w
(Trickey,) 3690 5268 w
(Phil) 4121 5268 w
(Winterbottom,) 4345 5268 w
10 /LucidaSansUnicode20 f
(\030\030) 720 5388 w
10 /LucidaSansUnicode00 f
(The) 784 5388 w
(Use) 1004 5388 w
(of) 1219 5388 w
(Name) 1355 5388 w
(Spaces) 1671 5388 w
(in) 2039 5388 w
(Plan) 2168 5388 w
(9,) 2407 5388 w
10 /LucidaSansUnicode20 f
(\031\031) 2502 5388 w
10 /LucidaSansUnicode00 f
(Operating) 2604 5388 w
(Systems) 3125 5388 w
(Review,) 3557 5388 w
10 /LucidaSans-Demi f
(27) 3960 5388 w
10 /LucidaSansUnicode00 f
(,) 4088 5388 w
(2,) 4158 5388 w
(April) 4291 5388 w
(1993,) 4560 5388 w
(pp.) 4882 5388 w
(72-76) 720 5508 w
(\(reprinted) 1076 5508 w
(from) 1603 5508 w
(Proceedings) 1881 5508 w
(of) 2515 5508 w
(the) 2660 5508 w
(5th) 2862 5508 w
(ACM) 3071 5508 w
(SIGOPS) 3342 5508 w
(European) 3731 5508 w
(Workshop,) 4232 5508 w
(Mont) 4794 5508 w
(Saint-Michel, 1992, Paper n\272 34\).) 720 5628 w
([RFC2138]) 720 5784 w
(C.) 1259 5784 w
(Rigney,) 1395 5784 w
(A.) 1786 5784 w
(Rubens,) 1922 5784 w
(W.) 2347 5784 w
(Simpson,) 2501 5784 w
(S.) 2982 5784 w
(Willens,) 3104 5784 w
10 /LucidaSansUnicode20 f
(\030\030) 3514 5784 w
10 /LucidaSansUnicode00 f
(Remote) 3578 5784 w
(Authentication) 3980 5784 w
(Dial) 4725 5784 w
(In) 4949 5784 w
(User Service \(RADIUS\),) 720 5904 w
10 /LucidaSansUnicode20 f
(\031\031) 1797 5904 w
10 /LucidaSansUnicode00 f
(RFC2138, April 1997.) 1893 5904 w
([RiLa]) 720 6060 w
(Ronald) 1023 6060 w
(L.) 1393 6060 w
(Rivest) 1515 6060 w
(and) 1840 6060 w
(Butler) 2057 6060 w
(Lampson,) 2378 6060 w
10 /LucidaSansUnicode20 f
(\030\030) 2886 6060 w
10 /LucidaSansUnicode00 f
(SDSI) 2950 6060 w
10 /LucidaSansUnicode20 f
(\024) 3162 6060 w
10 /LucidaSansUnicode00 f
(A) 3262 6060 w
(Simple) 3369 6060 w
(Distributed) 3731 6060 w
(Security) 4312 6060 w
(Infras\255) 4732 6060 w
(tructure,) 720 6180 w
10 /LucidaSansUnicode20 f
(\031\031) 1139 6180 w
10 /LucidaTypewriter f
(http://theory.lcs.mit.edu/~rivest/sdsi10.ps) 1275 6180 w
10 /LucidaSansUnicode00 f
(.) 4371 6180 w
([Schn]) 720 6336 w
(Bruce) 1129 6336 w
(Schneier,) 1511 6336 w
(Password) 2068 6336 w
(Safe,) 2636 6336 w
10 /LucidaTypewriter f
(http://www.counterpane.com/\255) 3024 6336 w
(passsafe.html) 720 6456 w
10 /LucidaSansUnicode00 f
(.) 1656 6456 w
([Sama96]) 720 6612 w
(Vipin) 1219 6612 w
(Samar,) 1517 6612 w
10 /LucidaSansUnicode20 f
(\030\030) 1897 6612 w
10 /LucidaSansUnicode00 f
(Unified) 1961 6612 w
(Login) 2356 6612 w
(with) 2673 6612 w
(Pluggable) 2928 6612 w
(Authentication) 3451 6612 w
(Modules) 4210 6612 w
(\(PAM\),) 4668 6612 w
10 /LucidaSansUnicode20 f
(\031\031) 4976 6612 w
10 /LucidaSansUnicode00 f
(Proceedings) 720 6732 w
(of) 1351 6732 w
(the) 1493 6732 w
(Third) 1692 6732 w
(ACM) 1993 6732 w
(Conference) 2260 6732 w
(on) 2854 6732 w
(Computer) 3020 6732 w
(Communications) 3545 6732 w
(and) 4403 6732 w
(Security,) 4626 6732 w
(March 1996, New Delhi, India.) 720 6852 w
([Stei88]) 720 7008 w
(Jennifer) 1147 7008 w
(G.) 1580 7008 w
(Steiner,) 1743 7008 w
(Clifford) 2169 7008 w
(Neumann,) 2594 7008 w
(and) 3149 7008 w
(Jeffrey) 3388 7008 w
(I.) 3757 7008 w
(Schiller,) 3877 7008 w
10 /LucidaSansUnicode20 f
(\030\030) 4320 7008 w
10 /LucidaSans-Italic f
(Kerberos) 4384 7008 w
10 /LucidaSansUnicode00 f
(:) 4817 7008 w
(An) 4909 7008 w
(Authentication) 720 7128 w
(Service) 1471 7128 w
(for) 1852 7128 w
(Open) 2033 7128 w
(Network) 2334 7128 w
(Systems,) 2780 7128 w
10 /LucidaSansUnicode20 f
(\031\031) 3206 7128 w
10 /LucidaSansUnicode00 f
(Proceedings) 3312 7128 w
(of) 3940 7128 w
(USENIX) 4079 7128 w
(Winter) 4463 7128 w
(Con\255) 4815 7128 w
(ference, Dallas, Texas, February 1988, p. 191) 720 7248 w
10 /LucidaSansUnicode20 f
(\023) 2939 7248 w
10 /LucidaSansUnicode00 f
(202.) 2989 7248 w
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10 /LucidaSansUnicode00 f
(\255 19 \255) 2752 480 w
([Wu98]) 720 840 w
(T.) 1099 840 w
(Wu,) 1233 840 w
10 /LucidaSansUnicode20 f
(\030\030) 1453 840 w
10 /LucidaSansUnicode00 f
(The) 1517 840 w
(Secure) 1738 840 w
(Remote) 2098 840 w
(Password) 2504 840 w
(Protocol,) 2998 840 w
10 /LucidaSansUnicode20 f
(\031\031) 3426 840 w
10 /LucidaSansUnicode00 f
(Proceedings) 3530 840 w
(of) 4157 840 w
(the) 4295 840 w
(1998) 4490 840 w
(Inter\255) 4782 840 w
(net) 720 960 w
(Society) 925 960 w
(Network) 1315 960 w
(and) 1769 960 w
(Distributed) 1999 960 w
(System) 2592 960 w
(Security) 2985 960 w
(Symposium,) 3416 960 w
(San) 4055 960 w
(Diego,) 4275 960 w
(CA,) 4639 960 w
(Mar) 4858 960 w
(1998, pp. 97-111.) 720 1080 w
([Ylon96]) 720 1236 w
(Ylonen,) 1178 1236 w
(T.,) 1594 1236 w
10 /LucidaSansUnicode20 f
(\030\030) 1773 1236 w
10 /LucidaSansUnicode00 f
(SSH) 1837 1236 w
10 /LucidaSansUnicode20 f
(\024) 2019 1236 w
10 /LucidaSansUnicode00 f
(Secure) 2119 1236 w
(Login) 2491 1236 w
(Connections) 2811 1236 w
(Over) 3465 1236 w
(the) 3745 1236 w
(Internet,) 3953 1236 w
10 /LucidaSansUnicode20 f
(\031\031) 4365 1236 w
10 /LucidaSansUnicode00 f
(6th) 4482 1236 w
(USENIX) 4697 1236 w
(Security Symposium, pp. 37-42. San Jose, CA, Jul. 1996.) 720 1356 w
10 /LucidaSans-Demi f
(Appendix: Summary of the PAK protocol) 720 1596 w
10 /LucidaSansUnicode00 f
(Let) 720 1752 w
11 /LucidaSans-Italic f
(q) 913 1752 w
(>) 1007 1752 w
11 /LucidaSansUnicode00 f
(2) 1094 1752 w
8 /LucidaSansUnicode00 f
(160) 1169 1708 w
10 /LucidaSansUnicode00 f
(and) 1375 1752 w
11 /LucidaSans-Italic f
(p) 1602 1752 w
(>) 1696 1752 w
11 /LucidaSansUnicode00 f
(2) 1783 1752 w
8 /LucidaSansUnicode00 f
(1024) 1858 1708 w
10 /LucidaSansUnicode00 f
(be) 2114 1752 w
(primes) 2280 1752 w
(such) 2660 1752 w
(that) 2933 1752 w
11 /LucidaSans-Italic f
(p) 3171 1752 w
11 /S f
(=) 3265 1752 w
11 /LucidaSans-Italic f
(rq) 3344 1752 w
11 /S f
(+) 3491 1752 w
11 /LucidaSansUnicode00 f
(1) 3570 1752 w
10 /LucidaSansUnicode00 f
(with) 3686 1752 w
11 /LucidaSans-Italic f
(r) 3938 1752 w
10 /LucidaSansUnicode00 f
(not) 4038 1752 w
(a) 4246 1752 w
(multiple) 4349 1752 w
(of) 4795 1752 w
11 /LucidaSans-Italic f
(q) 4941 1752 w
10 /LucidaSansUnicode00 f
(.) 5008 1752 w
(Take) 720 1872 w
11 /LucidaSans-Italic f
(h) 1001 1872 w
11 /S f
(\316) 1078 1872 w
11 /LucidaSans-Italic f
(Z) 1165 1872 w
8 /LucidaSans-Italic f
(p) 1235 1894 w
(*) 1235 1828 w
10 /LucidaSansUnicode00 f
(such) 1342 1872 w
(that) 1617 1872 w
11 /LucidaSans-Italic f
(g) 1856 1872 w
11 /LucidaSansUnicode22 f
(a) 1932 1872 w
11 /LucidaSans-Italic f
(h) 2029 1872 w
8 /LucidaSans-Italic f
(r) 2110 1828 w
10 /LucidaSansUnicode00 f
(is) 2205 1872 w
(not) 2333 1872 w
(1.) 2541 1872 w
(These) 2716 1872 w
(parameters) 3052 1872 w
(may) 3648 1872 w
(be) 3896 1872 w
(chosen) 4063 1872 w
(by) 4454 1872 w
(the) 4617 1872 w
(NIST) 4820 1872 w
(algorithm for DSA,) 720 1992 w
(and) 1655 1992 w
(are) 1868 1992 w
(public,) 2053 1992 w
(fixed) 2415 1992 w
(values.) 2694 1992 w
(The) 3096 1992 w
(client) 3310 1992 w
11 /LucidaSans-Italic f
(C) 3607 1992 w
10 /LucidaSansUnicode00 f
(knows) 3715 1992 w
(a) 4057 1992 w
(secret) 4145 1992 w
11 /LucidaSansUnicode03 f
(\300) 4470 1992 w
10 /LucidaSansUnicode00 f
(and) 4589 1992 w
(com\255) 4802 1992 w
(putes) 720 2112 w
11 /LucidaSans-Italic f
(H) 1034 2112 w
11 /LucidaSansUnicode22 f
(a) 1124 2112 w
11 /LucidaSansUnicode00 f
(\() 1221 2112 w
11 /LucidaSans-Italic f
(H) 1266 2112 w
8 /LucidaSansUnicode00 f
(1) 1360 2134 w
11 /LucidaSansUnicode00 f
(\() 1428 2112 w
11 /LucidaSans-Italic f
(C) 1473 2112 w
11 /LucidaSansUnicode00 f
(,) 1557 2112 w
11 /LucidaSansUnicode03 f
(\300) 1645 2112 w
11 /LucidaSansUnicode00 f
(\)) 1740 2112 w
(\)) 1785 2112 w
8 /LucidaSans-Italic f
(r) 1834 2068 w
10 /LucidaSansUnicode00 f
(and) 1926 2112 w
11 /LucidaSans-Italic f
(H) 2151 2112 w
8 /S f
(-) 2245 2068 w
8 /LucidaSansUnicode00 f
(1) 2302 2068 w
10 /LucidaSansUnicode00 f
(,) 2361 2112 w
(where) 2438 2112 w
11 /LucidaSans-Italic f
(H) 2775 2112 w
8 /LucidaSansUnicode00 f
(1) 2869 2134 w
10 /LucidaSansUnicode00 f
(is) 2973 2112 w
(a) 3098 2112 w
(hash) 3198 2112 w
(function) 3473 2112 w
(yielding) 3919 2112 w
(a) 4346 2112 w
(random) 4446 2112 w
(ele\255) 4866 2112 w
(ment) 720 2232 w
(of) 1002 2232 w
11 /LucidaSans-Italic f
(Z) 1134 2232 w
8 /LucidaSans-Italic f
(p) 1204 2254 w
(*) 1204 2188 w
10 /LucidaSansUnicode00 f
(,) 1262 2232 w
(and) 1328 2232 w
11 /LucidaSans-Italic f
(H) 1542 2232 w
8 /S f
(-) 1636 2188 w
8 /LucidaSansUnicode00 f
(1) 1693 2188 w
10 /LucidaSansUnicode00 f
(may) 1787 2232 w
(be) 2022 2232 w
(computed) 2176 2232 w
(by) 2697 2232 w
(gcd.) 2847 2232 w
(\(All) 3122 2232 w
(arithmetic) 3317 2232 w
(is) 3842 2232 w
(modulo) 3957 2232 w
11 /LucidaSans-Italic f
(p) 4361 2232 w
10 /LucidaSansUnicode00 f
(.\)) 4428 2232 w
(The) 4560 2232 w
(client) 4776 2232 w
(gives) 720 2352 w
11 /LucidaSans-Italic f
(H) 1013 2352 w
8 /S f
(-) 1107 2308 w
8 /LucidaSansUnicode00 f
(1) 1164 2308 w
10 /LucidaSansUnicode00 f
(to) 1266 2352 w
(the) 1407 2352 w
(server) 1605 2352 w
11 /LucidaSans-Italic f
(S) 1945 2352 w
10 /LucidaSansUnicode00 f
(ahead) 2049 2352 w
(of) 2383 2352 w
(time) 2524 2352 w
(by) 2782 2352 w
(a) 2940 2352 w
(private) 3038 2352 w
(channel.) 3414 2352 w
(To) 3898 2352 w
(start) 4065 2352 w
(a) 4329 2352 w
(new) 4427 2352 w
(connec\255) 4664 2352 w
(tion,) 720 2472 w
(the) 988 2472 w
(client) 1190 2472 w
(generates) 1501 2472 w
(a) 2024 2472 w
(random) 2126 2472 w
(value) 2548 2472 w
11 /LucidaSans-Italic f
(x) 2850 2472 w
10 /LucidaSansUnicode00 f
(,) 2909 2472 w
(computes) 2989 2472 w
11 /LucidaSans-Italic f
(m) 3511 2472 w
11 /LucidaSansUnicode22 f
(a) 3622 2472 w
11 /LucidaSans-Italic f
(g) 3719 2472 w
8 /LucidaSans-Italic f
(x) 3799 2428 w
11 /LucidaSans-Italic f
(H) 3851 2472 w
10 /LucidaSansUnicode00 f
(,) 3932 2472 w
(then) 4012 2472 w
(calls) 4277 2472 w
(the) 4540 2472 w
(server) 4743 2472 w
(and) 720 2592 w
(sends) 941 2592 w
11 /LucidaSans-Italic f
(C) 1265 2592 w
10 /LucidaSansUnicode00 f
(and) 1381 2592 w
11 /LucidaSans-Italic f
(m) 1602 2592 w
10 /LucidaSansUnicode00 f
(.) 1704 2592 w
(The) 1809 2592 w
(server) 2031 2592 w
(checks) 2369 2592 w
11 /LucidaSans-Italic f
(m) 2739 2592 w
11 /LucidaSansUnicode22 f
(`) 2850 2592 w
11 /LucidaSansUnicode00 f
(0) 2947 2592 w
(mod) 3069 2592 w
11 /LucidaSans-Italic f
(p) 3360 2592 w
10 /LucidaSansUnicode00 f
(,) 3427 2592 w
(generates) 3500 2592 w
(random) 4017 2592 w
11 /LucidaSans-Italic f
(y) 4433 2592 w
10 /LucidaSansUnicode00 f
(,) 4494 2592 w
(computes) 4566 2592 w
11 /LucidaSansUnicode03 f
(\274) 720 2712 w
11 /LucidaSansUnicode22 f
(a) 798 2712 w
11 /LucidaSans-Italic f
(g) 895 2712 w
8 /LucidaSans-Italic f
(y) 975 2668 w
10 /LucidaSansUnicode00 f
(,) 1028 2712 w
11 /LucidaSansUnicode03 f
(\303) 1106 2712 w
11 /LucidaSansUnicode22 f
(a) 1189 2712 w
11 /LucidaSansUnicode00 f
(\() 1286 2712 w
11 /LucidaSans-Italic f
(mH) 1331 2712 w
8 /S f
(-) 1527 2668 w
8 /LucidaSansUnicode00 f
(1) 1584 2668 w
11 /LucidaSansUnicode00 f
(\)) 1652 2712 w
8 /LucidaSans-Italic f
(y) 1701 2668 w
10 /LucidaSansUnicode00 f
(,) 1754 2712 w
(and) 1829 2712 w
(sends) 2052 2712 w
11 /LucidaSans-Italic f
(S) 2378 2712 w
10 /LucidaSansUnicode00 f
(,) 2439 2712 w
11 /LucidaSansUnicode03 f
(\274) 2515 2712 w
10 /LucidaSansUnicode00 f
(,) 2584 2712 w
11 /LucidaSans-Italic f
(k) 2660 2712 w
11 /LucidaSansUnicode22 f
(a) 2733 2712 w
11 /LucidaSans-Italic f
(sha1) 2830 2712 w
11 /LucidaSansUnicode00 f
(\() 3097 2712 w
("server") 3142 2712 w
(,) 3560 2712 w
11 /LucidaSans-Italic f
(C) 3604 2712 w
11 /LucidaSansUnicode00 f
(,) 3688 2712 w
11 /LucidaSans-Italic f
(S) 3732 2712 w
11 /LucidaSansUnicode00 f
(,) 3802 2712 w
11 /LucidaSans-Italic f
(m) 3846 2712 w
11 /LucidaSansUnicode00 f
(,) 3957 2712 w
11 /LucidaSansUnicode03 f
(\274) 4001 2712 w
11 /LucidaSansUnicode00 f
(,) 4079 2712 w
11 /LucidaSansUnicode03 f
(\303) 4123 2712 w
11 /LucidaSansUnicode00 f
(,) 4206 2712 w
11 /LucidaSans-Italic f
(H) 4250 2712 w
8 /S f
(-) 4344 2668 w
8 /LucidaSansUnicode00 f
(1) 4401 2668 w
11 /LucidaSansUnicode00 f
(\)) 4469 2712 w
10 /LucidaSansUnicode00 f
(.) 4505 2712 w
(Next) 4613 2712 w
(the) 4885 2712 w
(client) 720 2832 w
(computes) 1051 2832 w
11 /LucidaSansUnicode03 f
(\303) 1592 2832 w
11 /S f
(=) 1684 2832 w
11 /LucidaSansUnicode03 f
(\274) 1763 2832 w
8 /LucidaSans-Italic f
(x) 1838 2788 w
10 /LucidaSansUnicode00 f
(,) 1890 2832 w
(verifies) 1988 2832 w
11 /LucidaSans-Italic f
(k) 2405 2832 w
10 /LucidaSansUnicode00 f
(,) 2469 2832 w
(and) 2567 2832 w
(sends) 2813 2832 w
11 /LucidaSans-Italic f
(k) 3162 2832 w
11 /S f
(\242) 3235 2832 w
11 /LucidaSansUnicode22 f
(a) 3272 2832 w
11 /LucidaSans-Italic f
(sha1) 3369 2832 w
11 /LucidaSansUnicode00 f
(\() 3636 2832 w
("client") 3681 2832 w
(,) 4063 2832 w
11 /LucidaSans-Italic f
(C) 4107 2832 w
11 /LucidaSansUnicode00 f
(,) 4191 2832 w
11 /LucidaSans-Italic f
(S) 4235 2832 w
11 /LucidaSansUnicode00 f
(,) 4305 2832 w
11 /LucidaSans-Italic f
(m) 4349 2832 w
11 /LucidaSansUnicode00 f
(,) 4460 2832 w
11 /LucidaSansUnicode03 f
(\274) 4504 2832 w
11 /LucidaSansUnicode00 f
(,) 4582 2832 w
11 /LucidaSansUnicode03 f
(\303) 4626 2832 w
11 /LucidaSansUnicode00 f
(,) 4709 2832 w
11 /LucidaSans-Italic f
(H) 4753 2832 w
8 /S f
(-) 4847 2788 w
8 /LucidaSansUnicode00 f
(1) 4904 2788 w
11 /LucidaSansUnicode00 f
(\)) 4972 2832 w
10 /LucidaSansUnicode00 f
(.) 5008 2832 w
(The) 720 2952 w
(server) 1033 2952 w
(then) 1462 2952 w
(verifies) 1811 2952 w
11 /LucidaSans-Italic f
(k) 2294 2952 w
11 /S f
(\242) 2367 2952 w
10 /LucidaSansUnicode00 f
(and) 2527 2952 w
(both) 2839 2952 w
(sides) 3194 2952 w
(begin) 3576 2952 w
(using) 3981 2952 w
(session) 4380 2952 w
(key) 4874 2952 w
11 /LucidaSans-Italic f
(K) 720 3072 w
11 /LucidaSansUnicode22 f
(a) 799 3072 w
11 /LucidaSans-Italic f
(sha1) 896 3072 w
11 /LucidaSansUnicode00 f
(\() 1163 3072 w
("session") 1208 3072 w
(,) 1696 3072 w
11 /LucidaSans-Italic f
(C) 1740 3072 w
11 /LucidaSansUnicode00 f
(,) 1824 3072 w
11 /LucidaSans-Italic f
(S) 1868 3072 w
11 /LucidaSansUnicode00 f
(,) 1938 3072 w
11 /LucidaSans-Italic f
(m) 1982 3072 w
11 /LucidaSansUnicode00 f
(,) 2093 3072 w
11 /LucidaSansUnicode03 f
(\274) 2137 3072 w
11 /LucidaSansUnicode00 f
(,) 2215 3072 w
11 /LucidaSansUnicode03 f
(\303) 2259 3072 w
11 /LucidaSansUnicode00 f
(,) 2342 3072 w
11 /LucidaSans-Italic f
(H) 2386 3072 w
8 /S f
(-) 2480 3028 w
8 /LucidaSansUnicode00 f
(1) 2537 3028 w
11 /LucidaSansUnicode00 f
(\)) 2605 3072 w
10 /LucidaSansUnicode00 f
(.) 2641 3072 w
(In) 2766 3072 w
(the) 2918 3072 w
(published) 3134 3072 w
(version) 3673 3072 w
(of) 4086 3072 w
(PAK,) 4245 3072 w
(the) 4527 3072 w
(server) 4743 3072 w
(name) 720 3192 w
11 /LucidaSans-Italic f
(S) 1021 3192 w
10 /LucidaSansUnicode00 f
(is) 1117 3192 w
(included) 1232 3192 w
(in) 1682 3192 w
(the) 1808 3192 w
(initial) 1998 3192 w
(hash) 2303 3192 w
11 /LucidaSans-Italic f
(H) 2568 3192 w
10 /LucidaSansUnicode00 f
(,) 2649 3192 w
(but) 2717 3192 w
(doing) 2915 3192 w
(so) 3228 3192 w
(is) 3376 3192 w
(inconvenient) 3492 3192 w
(in) 4147 3192 w
(our) 4274 3192 w
(application,) 4474 3192 w
(as the server may be known by various equivalent names.) 720 3312 w
(MacKenzie) 720 3468 w
(has) 1289 3468 w
(shown) 1509 3468 w
([Mack]) 1874 3468 w
(that) 2242 3468 w
(the) 2485 3468 w
(equivalence) 2692 3468 w
(proof) 3315 3468 w
([Boyk00]) 3630 3468 w
(can) 4104 3468 w
(be) 4325 3468 w
(adapted) 4497 3468 w
(to) 4942 3468 w
(cover our version.) 720 3588 w
cleartomark
showpage
saveobj restore
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%%Trailer
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