Method and device for limiting the number of authentication operations of a chip card chip
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United States of America Patent
Stats
-
Aug 27, 1996
Grant Date -
N/A
app pub date -
May 25, 1994
filing date -
May 26, 1993
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
To resolve the problems related to the divulgation of the algorithms for the transcoding of the secret codes in chip cards, notably prepayment type chip cards, it is planned to limit the number of authentication operations possible by the number of units contained in the card. It is shown that in this case this number, which is generally small, for example about a hundred units, limits the number of attempts that can be made by a fraudulent person trying to penetrate the mysteries of the secret enciphering algorithm.
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