Dynamic data interpretation method for a chip card

G - Physics – 07 – F

Patent

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G07F 7/10 (2006.01)

Patent

CA 2275940

In order to reduce the duration for establishing verification protocols during the connection of a chip card to a reader, to reduce the risks of corruption during this operation and to limit memory occupancy, it is proposed to constitute a signature which can be used for verifying the adequacy of the chip card for implementing an application. This signature is carried out by a signature machine which prepares a concatenated word including all the data required for producing this signature. Thus it is possible to modify on request the structure of the required signature for an application without having to modify the operational system of the memory chip.

Pour réduire la durée d'établissement des protocoles de vérification lors de la connexion d'une carte à puce à un lecteur, pour réduire les risques de corruption lors de cet établissement, et pour limiter l'occupation mémoire, il est prévu la constitution d'une signature utile à vérifier l'adéquation d'une carte à puce à la mise en oeuvre d'une application donnée. Cette signature est effectuée par un moteur de signature qui prépare un mot concaténé rassemblant toutes les données utiles à l'élaboration de cette signature. On montre qu'il est ainsi possible de modifier à la demande la structure de la signature requise pour une application sans avoir besoin de modifier le système opératoire de la puce.

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