Electrical computers and digital processing systems: support – Data processing protection using cryptography
Reexamination Certificate
2006-12-14
2011-12-20
Chea, Philip (Department: 2492)
Electrical computers and digital processing systems: support
Data processing protection using cryptography
C713S168000, C380S044000, C726S020000
Reexamination Certificate
active
08082450
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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Apvrille Axelle
Bolignano Dominique
Frey Alexandre
Browdy and Neimark PLLC
Chea Philip
Shepperd Eric W
Trusted Logic
LandOfFree
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