Small size product cipher apparatus

Details Small size product cipher apparatus Small size product cipher apparatus

1995-12-21

1997-11-11

Gregory, Bernarr E.

Cryptography

Communication system using cryptography

Data stream/substitution enciphering

380 9, 380 28, 380 29, 380 37, 380 43, 380 49, H04L 918, H04L 928, H04L 900

Patent

active

056872380

ABSTRACT:
In a product cipher apparatus, a permutation is performed upon plaintext or ciphertext to generate a first message. At least two successive substitutions are performed upon the first message to generate a second message, and the same permutation is performed upon the second message to generate a third message. The successive substitutions and the permutation are repeatedly performed upon the third message to obtain ciphertext or plaintext.

REFERENCES:
patent: 4157454 (1979-06-01), Becker
patent: 4172213 (1979-10-01), Barnes et al.
patent: 4275265 (1981-06-01), Davida et al.
patent: 4751733 (1988-06-01), Delayaye et al.
patent: 5231662 (1993-07-01), Van Rumpt et al.
patent: 5301235 (1994-04-01), Shimada
patent: 5317638 (1994-05-01), Kao et al.
patent: 5442705 (1995-08-01), Miyano
D.E.R. Denning, "Cryptography and Data Security", Addison-Wesley Publishing Company, 1982, pp. v-xiii and 1-133.

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