APPLIED CRYPTOGRAPHY, SECOND EDITION: Protocols, Algorithms, and Source Code in C:Still Other Block Ciphers

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Applied Cryptography, Second Edition: Protocols, Algorthms, and Source Code in C (cloth)
(Publisher: John Wiley & Sons, Inc.)
Author(s): Bruce Schneier
ISBN: 0471128457
Publication Date: 01/01/96

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Cryptanalysis of GOST

These are the major differences between DES and GOST.

— DES has a complicated procedure for generating the subkeys from the keys. GOST has a very simple procedure.

— DES has a 56-bit key; GOST has a 256-bit key. If you add in the secret S-box permutations, GOST has a total of about 610 bits of secret information.

Table 14.2 GOST S-Boxes

	*S-box 1:*
4	10	9	2	13	8	0	14	6	11	1	12	7	15	5	3
	*S-box 2:*
14	11	4	12	6	13	15	10	2	3	8	1	0	7	5	9
	*S-box 3:*
5	8	1	13	10	3	4	2	14	15	12	7	6	0	9	11
	*S-box 4:*
7	13	10	1	0	8	9	15	14	4	6	12	11	2	5	3
	*S-box 5:*
6	12	7	1	5	15	13	8	4	10	9	14	0	3	11	2
	*S-box 6:*
4	11	10	0	7	2	1	13	3	6	8	5	9	12	15	14
	*S-box 7:*
13	11	4	1	3	15	5	9	0	10	14	7	6	8	2	12
	*S-box 8:*
1	15	13	0	5	7	10	4	9	2	3	14	6	11	8	12

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