Secret code security access to data processing means

Details Secret code security access to data processing means Secret code security access to data processing means

2001-06-21

2008-10-07

Vu, Kimyen (Department: 2135)

Electrical computers and digital processing systems: support

Data processing protection using cryptography

Tamper resistant

C713S159000, C713S172000, C713S181000, C713S182000, C713S183000, C713S184000, C713S185000, C726S009000, C726S020000

Reexamination Certificate

active

07434070

ABSTRACT:
Access control to data processing means, such as a smart card, is made secure by simulating a comparison block by block of part of a secret code with part of a presented code through a block-by-block comparison of part of the presented code and part of a determined number when the presented code is found to be erroneous. Each time the card is used, a constant number of operations are applied to the presented code and at least for part of the secret code, and at most for a complementary part to the determined number, thus avoiding different signatures of power consumption for different presented codes.

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