Method for securely managing a units counter and security...

H - Electricity – 04 – M

Patent

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Details

H04M 17/00 (2006.01) G07F 7/02 (2006.01) G07F 7/08 (2006.01) G07F 7/10 (2006.01) H04M 17/02 (2006.01)

Patent

CA 2323712

The invention concerns a method for securely managing a units counter in an electrically programmable and erasable memory, whereby a number of units consumed by users is recorded by means of a counter, consisting in breaking down the units counter into at least two memory zones (A, B), one first zone (A) wherein a bit is stored per unit consumed and a second zone (B) wherein the value corresponding to the accumulation of bits consumed is stored, the second zone being only updated when the number of units consumed exceeds or reaches the number of non-stored bits in the first zone. The invention is applicable to security modules provided in telephone terminals.

L'invention concerne un procédé de gestion sécurisée d'un compteur d'unités dans une mémoire programmable et effaçable électriquement, selon lequel on enregistre un nombre d'unités consommées par des utilisateurs au moyen du compteur, consistant à décomposer le compteur d'unités en au moins deux zones mémoires (A, B), une première zone (A) dans laquelle on grille un bit par unité consommée et une deuxième zone (B) dans laquelle on mémorise la valeur correspondant au cumul d'unités consommées, la deuxième zone n'étant mise à jour que lorsque le nombre d'unités consommées dépasse ou atteint le nombre de bits non grillé dans la première zone. Application aux modules de sécurité placés dans des terminaux téléphoniques.

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