Chip card for executing non-modifiable system program...

Details Chip card for executing non-modifiable system program... Chip card for executing non-modifiable system program...

G - Physics

07

F

G07F 7/10 (2006.01) G06K 19/07 (2006.01)

Patent

CA 2294469

The inventive chip card (CK) has an operating system (H) for executing non- modifiable system program routines (U). Before a system program routine (U) is executed, said operating system (H) requests a check routine (OMF) and allocates said check routine (OMF) an ID code, said ID code (Q11) identifying the corresponding system program routine (U). Using the check routine (OMF) and the ID code, the operating system (H) checks whether a replacement program routine (U') has been allocated (Q12) to the system program routine (U), and if this is the case (Q31), executes said replacement program routine (U'). In the event that no replacement program routine has been allocated (Q32), the system program routine (U) is executed (Q41). The non-modifiable system program routines (U) are stored especially in a non-volatile read-only memory (S1, ROM) and the replacement program routines (U') especially in a write read memory (S2, EEPROM) of the chip card (CK).

L'invention concerne une carte à puce (CK) possédant un système d'exploitation (H) destiné à l'exécution de routines de programme système (U) non modifiables. Ce système d'exploitation appelle une routine de vérification (OMF) avant l'exécution d'une routine de programme système (U) et lui attribue un code ID qui caractérise (Q11) la routine de programme système (U) en question. A l'aide de la routine de vérification OMF et du code ID, le système d'exploitation (H) vérifie si une routine de programme de remplacement (U') est affectée à la routine de programme système (U) (Q12). Si c'est le cas (Q31), il exécute la routine de programme de remplacement (U'). Dans le cas contraire (Q32), c'est la routine de programme système (U) qui est exécutée (Q41). Les routines de programme système (U) non modifiables sont mémorisées notamment dans une mémoire morte non volatile (S1, ROM) et la routine de programme de remplacement (U') est mémorisée notamment dans une mémoire à lecture-écriture (S2, EEPROM) de la carte à puce (CK).

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