bdes.ps

早期freebsd实现

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612 792 0 FMBEGINPAGE
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1.2 (IMPLEMENT) 178.34 388 S
1.2 (A) 258.88 388 S
1.2 (TION NOTES ON ) 267.85 388 S
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1.2 (bdes) 382.61 388 S
0 F
1.2 (\0501\051) 415.4 388 S
1.2 (Matt Bishop) 265.09 338 S
1.2 (T) 197.74 288 S
1.2 (echnical Report PCS-TR91-158) 205.38 288 S
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72 32.69 540 42.7 R
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(Page 1 of 11) 479.71 34.7 T
72 72 540 720 R
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1 F
0 X
(Implementation Notes on ) 179.84 708 T
2 F
(bdes) 378.21 708 T
1 F
(\0501\051) 411.19 708 T
0 F
( ) 432.17 708 T
3 F
(Matt Bishop) 276.51 676 T
0 F
(Department of Mathematics and Computer Science) 182.92 656 T
(Dartmouth College) 259.86 642 T
(Hanover) 257.45 628 T
(, NH 03755) 298.26 628 T
3 F
(ABSTRACT) 277.68 602 T
0 F
0.27 (This note describes the implementation of ) 108 582 P
3 F
0.27 (bdes) 314.13 582 P
0 F
0.27 (, the \336le encryption program being) 336.12 582 P
0.36 (distributed in the 4.4 release of the Berkeley Software Distribution. It implements) 108 568 P
(all modes of the Data Encryption Standard program.) 108 554 T
4 F
(1. Intr) 72 528 T
(oduction) 104.43 528 T
0 F
-0.09 (The Data Encryption Standard is a standard endorsed by the federal government. It is con-) 108 504 P
-0.56 (siderably stronger than the algorithm used by the ) 72 484 P
5 F
-0.47 (UNIX) 305.36 484 P
0 F
-0.56 (\252 ) 330.34 484 P
3 F
-0.56 (crypt) 344.53 484 P
0 F
-0.56 (\0501\051 program, and therefore is a more) 369.18 484 P
0.11 (suitable candidate for protecting information, especially information contained in ) 72 464 P
5 F
0.09 (ASCII) 466.05 464 P
0 F
0.11 ( \336les. The) 492.14 464 P
-0.65 (program ) 72 444 P
3 F
-0.65 (bdes) 114.99 444 P
0 F
-0.65 (\0501\051 implements the DES and all of its modes, including the two authentication modes.) 136.97 444 P
-0.59 (Because others may wish to write software compatible with this program, this note presents) 108 420 P
-0.04 (the layout of the encrypted \336les produced by ) 72 400 P
3 F
-0.04 (bdes) 288.86 400 P
0 F
-0.04 ( as well as internal details relevant to the imple-) 310.85 400 P
-0.15 (mentation. Whereever possible and appropriate, the description of the ) 72 380 P
3 F
-0.15 (des) 408.04 380 P
0 F
-0.15 (\0501\051 program given in [4]) 424.03 380 P
-0.2 (has been followed; thus, ) 72 360 P
3 F
-0.2 (bdes) 190.77 360 P
0 F
-0.2 ( is completely compatible with that program. However) 212.75 360 P
-0.2 (, ) 473.33 360 P
3 F
-0.2 (bdes) 479.12 360 P
0 F
-0.2 ( also of-) 501.11 360 P
(fers several extensions to ) 72 340 T
3 F
(des) 195.9 340 T
0 F
( that are not compatible, and these will be explicitly pointed out.) 211.89 340 T
-0.14 (In this note, strings typed as shown will be in ) 108 316 P
6 F
-0.34 (Courier Roman font) 326.78 316 P
0 F
-0.14 (, and strings to be) 455.62 316 P
-0.42 (chosen by the user will be in ) 72 296 P
7 F
-1 (Courier Oblique font) 209.32 296 P
0 F
-0.42 (. The space character \050) 351.24 296 P
5 F
-0.35 (ASCII) 457.79 296 P
0 F
-0.42 ( <) 483.88 296 P
5 F
-0.35 (SP) 493.23 296 P
0 F
-0.42 (>, octal) 504.34 296 P
-0.43 (40, decimal 32, hex 20\051 will be represented as \322) 72 276 P
8 F
-0.47 (z) 296.98 276 P
0 F
-0.43 (\323 and the newline character \050) 301.96 276 P
5 F
-0.35 (ASCII) 438.03 276 P
0 F
-0.43 ( <) 464.13 276 P
5 F
-0.35 (NL) 473.46 276 P
0 F
-0.43 (>, octal 12,) 486.79 276 P
-0.05 (decimal 10, hex a\051 as \322) 72 256 P
9 F
-0.05 (\277) 181.65 256 P
0 F
-0.05 (\323. Because it is often more convenient to represent arbitrary characters as) 189.54 256 P
1.13 (a sequence of hexadecimal digits, that representation will often be used; these digits will be in) 72 236 P
10 F
(Courier Bold font) 72 216 T
0 F
( with spaces often inserted for readability) 194.33 216 T
(.) 392.07 216 T
4 F
(2. Overview and Use) 72 184 T
3 F
-0.39 (Bdes) 108 160 P
0 F
-0.39 ( implements the Data Encryption Standard algorithm in software, and enables the user) 131.32 160 P
-0.61 (to encrypt data using any of the four modes of operation of the DES \050Electronic Code Book, Cipher) 72 140 P
72 72 540 720 C
72 72 540 117 C
72 72 549 108 R
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(This work is based on work funded by grant NAG2-680 from the National
Aeronautics and Space Administration to ) 72 101.33 T
(Dartmouth College.) 72 89.33 T
(UNIX is a Registered T) 72 77.33 T
(rademark of A) 166.58 77.33 T
(T&T Bell Laboratories.) 223.75 77.33 T
72 72 540 720 C
0 0 612 792 C
72 126 225 126 2 L
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