Method of processing data by compression and permutation for mic

Details Method of processing data by compression and permutation for mic Method of processing data by compression and permutation for mic

1990-07-24

1993-05-25

Cangialosi, Salvatore

Cryptography

Particular algorithmic function encoding

Nbs/des algorithm

380 50, H04L 906

Patent

active

052147010

ABSTRACT:
This method of processing data protected by a coding is particularly suitable to be used in microcircuit cards utilizing the method of processing data of the DES type. In the DES method, a step SP of transformation of compression S is included, which is followed by an irregular permutation P. According to the method, the transformation of compression S is effected in such a manner that the data to be stored are subjected beforehand to a permutation P, while a masking system is calculated specifically to permit the execution of the said step SP by recuperating only the desired bits, the latter then being automatically present at the predetermined storage locations.

REFERENCES:
patent: 4274085 (1981-06-01), Marino, Jr.
patent: 4908861 (1990-03-01), Brachtl et al.
patent: 5001753 (1991-03-01), Davio et al.
patent: 5003597 (1991-03-01), Merkle
patent: 5008935 (1991-04-01), Roberts
patent: 5068894 (1991-11-01), Hoppe
patent: 5150401 (1992-09-01), Ashby, III et al.

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