Secret code security access to data processing means
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United States of America Patent
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Oct 7, 2008
Grant Date -
Sep 11, 2003
app pub date -
Jun 21, 2001
filing date -
Aug 29, 2000
priority date (Note) -
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status (Latency Note)
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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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