Method for creating a secure counter on an on-board computer system comprising a chip card
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United States of America Patent
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Dec 20, 2011
Grant Date -
Dec 25, 2008
app pub date -
Dec 14, 2006
filing date -
Dec 23, 2005
priority date (Note) -
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status (Latency Note)
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Abstract
According to the inventive method, the chip card, a counting function (FC), a counter (Cpt) and a private key (Cf) stored in the write-only part of the memory region are stored in a persistent memory, the counter and the private key (Cf) being accessible only by the counting function (FC). When the chip card receives a counter request emitted by an requesting entity (ER), the counting function (FC) performs a modification of the counter (Cpt) and a calculation of a signature, and sends a response to the applicant entity (ER). When the on-board system receives the response to the counter request, the signature contained in the response is checked.
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