Crytographic system and process and its application

Details Crytographic system and process and its application Crytographic system and process and its application

1988-03-07

1991-03-19

Buczinski, Stephen C.

Cryptography

Particular algorithmic function encoding

Nbs/des algorithm

380 23, 380 24, 380 28, 380 42, 380 50, 235379, 235380, 34082534, H04L 906, H04L 928

Patent

active

050017535

ABSTRACT:
The subject of the present invention is a cryptographic system, having two inverse permutations, which can be implemented in a (micro) computer whose data processing resources are relatively limited. The two inverse permutations are processed with one and the same table, and the data zones, before and after permutation, occupy only one and the same memory zone. Applied to the DES cryptographic system, this can in particular be implemented in the memory card for the purpose of ensuring the security of transmissions between the card and a communication system; in particular the card reader of this system.

REFERENCES:
patent: 4259720 (1981-03-01), Campbell
patent: 4274085 (1981-06-01), Marino, Jr.
patent: 4275265 (1981-06-01), Davida et al.
patent: 4751733 (1988-06-01), Delayaye et al.
John D. Lenk, "Handbook of Microprocessors, Microcomputer, & Minicomputers", (Prentice-Hall, 1979; Section 1-9-4, pp. 36-37).

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