INTEGRATED CIRCUIT CARD HAVING A MODIFIABLE OPERATING PROGRAM AND CORRESPONDING METHOD OF MODIFICATION

摘要

The invention relates to a smart card including a processor unit (3) associated with a ROM (4) and with a programmable ROM (5), the ROM containing an operating program that can be executed by the processor unit and that includes functional portions, each defining a function of the processor unit. In accordance with the invention, the program includes an entry/exit point for each functional portion and an identifier is associated with each functional portion, the programmable ROM contains at least one substitutable functional portion suitable for substituting one of the functional portions of the ROM and associated with an identifier corresponding to the identifier of the corresponding functional portion of the ROM, and the processor unit is arranged to execute the substitutable functional portion instead of the corresponding substitutable functional portion of the ROM.