Method of processing data by compression and permutation for microcircuit cards
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United States of America Patent
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May 25, 1993
Grant Date -
N/A
app pub date -
Jul 24, 1990
filing date -
Jul 25, 1989
priority date (Note) -
Expired
status (Latency Note)
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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.
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