Method for storing data in a chip card rewritable memory

Details Method for storing data in a chip card rewritable memory Method for storing data in a chip card rewritable memory

G - Physics

07

F

G07F 7/10 (2006.01) G06F 17/30 (2006.01) G06F 12/02 (2006.01)

Patent

CA 2279823

The invention concerns a storing method which consists in adding, to the elementary transparent (5) or record (4) files of fixed lengths designed by the ISO 7816-4 standard, elementary files of variable lengths (7) with capacity always adapted to the size of records which they store, and in managing this new type of files with micro-instructions observing the formalism of the ISO 7816-4 standard and pertaining to the class of owner instructions. This novel elementary file with variable length opens up the prospect of novel chip cards conforming to the ISO 7816-4 standard and using data compression techniques for data storage, which is particularly interesting in view of the limited storage capacity of a chip card.

Ce procédé de stockage consiste à ajouter, aux fichiers élémentaires de longueurs fixes de types transparent (5) ou d'enregistrement (4) prévus par la norme ISO 7816-4, des fichiers élémentaires de longueurs variables (7) dont la capacité est toujours adaptée à la taille des enregistrements qu'ils stockent, et à gérer ce nouveau type de fichier avec des micro-instructions respectant le formalisme de la norme ISO 7816-4 et appartenant à la classe des instructions propriétaire. Grâce à ce nouveau type de fichier élémentaire de longueur variable, il est possible d'envisager de nouvelles cartes à puce respectant la norme ISO 7816-4 et mettant en oeuvre des techniques de compression de données au niveau du stockage des données, ce qui est particulièrement intéressant compte tenu des capacités de stockage de données limitées d'une carte à puce.

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