Method of modifying the instruction set of a smart card

Details Method of modifying the instruction set of a smart card Method of modifying the instruction set of a smart card

G - Physics

06

F

G06F 7/10 (2006.01) G06K 19/077 (2006.01)

Patent

CA 2246247

The invention provides a method of modifying and/or extending the instruction set (READ, WRITE) of a smart card (1). Use is made of the attribute tables (100, 200, 300) associated with certain files and with the commands of the existing instruction set to modify the functions of the instructions. Thus, non-standard functions may be implemented without the need to use additional, i.e. non-standard instructions.

L'invention concerne un procédé permettant de modifier et/ou d'étendre l'ensemble d'instructions (LECTURE, ECRITURE) d'une carte à puce (1). Pour cela, on utilise les tables d'attributs (100, 200, 300) associées à certains fichiers et aux commandes de l'ensemble d'instructions existant, de façon à modifier les fonctions des instructions. On peut ainsi implémenter des fonctions non standard sans avoir besoin d'utiliser des instructions supplémentaires, c'est-à-dire des instructions non standard.

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