Method for generating random numbers in a data processing...

G - Physics – 06 – F

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G06F 7/58 (2006.01) G07F 7/10 (2006.01)

Patent

CA 2046289

In a data processing system using portable objects (1) such as cards incorporating memory chips (11, 12, 13, 14, 15) and a processing circuit (10), where a first memory zone (11) is electrically erasable and writable at the request of the processing circuits in the object, random numbers are generated taking into account a first parameter taken from the first zone (11) and at least one second parameter written in a second, non-volatile zone (12) of the object, the content of this second zone being modified each time the first zone is erased such that the combination of parameters is never identical following the various erase operations on the first zone.

Dans un système de traitement de données à l'aide d'objets portatifs (I) tels que des cartes à mémoire (11, 12, 13, 14, 15) et à circuits de traitement (10), dont une première zone de mémoire (II) est effaçable et inscriptible électriquement sur requête des circuits de traitement de l'objet, des nombres aléatoires sont générés en prenant en compte un premier paramètre prélevé dans la première zone (11) et au moins un second paramètre inscrit dans une seconde zone (12) non volatile de l'objet, le contenu de cette seconde zone étant modifié à chaque effacement de la première, de sorte que la combinaison des paramètres ne se retrouve jamais à l'identique suite aux divers effacements de la première zone.

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