Method for the management of an application program loaded in a microcircuit medium
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United States of America Patent
Stats
-
Mar 2, 1993
Grant Date -
N/A
app pub date -
Sep 11, 1991
filing date -
Sep 12, 1990
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
To provide protection for the use of chip cards, the microprocessor of such a card is made, during the use of the card, to compute a signature according to complex encrypting algorithm taking account, firstly, of a secret code proper to the card and, secondly, of the instructions proper to the program. The signature thus computed is compared with a signature that has been pre-recorded in the card under the same conditions at the time of its delivery by the card-issuing party. It is shown that several uses can be authorized without jeopardizing their security.
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