Method for ensuring the safety of a security module, and...

G - Physics – 06 – F

Patent

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G06F 12/14 (2006.01) G06F 21/00 (2006.01) G07F 7/10 (2006.01) G06F 1/00 (2006.01)

Patent

CA 2247475

The invention concerns a method for ensuring the safety of a security module (8) designed for co-operating with a data processing device (1), said module being arranged for executing a set of operations including at least a sensitive operation (23). The invention is characterised in that the method comprises the following steps consisting in: executing, for each execution of the sensitive operation and upstream of it, a first sequence of supplementary operations (22) for activating signalling means and, downstream of said sensitive operation, a second set of supplementary operations (24) for deactivating said signalling means; verifying, for each execution of the sensitive operation and upstream of the first sequence of supplementary operations (22), whether the signalling means are deactivated; if the signalling means are activated, inhibiting the execution of the sensitive operation.

L'invention concerne un procédé de sécurisation d'un module de sécurité (8) destiné à coopérer avec un dispositif de traitement de l'information (1), le module étant agencé pour exécuter un ensemble d'opérations incluant au moins une opération sensible (23). Selon l'invention, ce procédé comprend les étapes consistant à: exécuter, à l'occasion de chaque exécution de l'opération sensible et en amont de celle-ci, une première séquence supplémentaire d'opérations (22) destinée à activer des moyens de signalisation et, en aval de ladite opération sensible, une seconde séquence supplémentaire d'opérations (24) destinée à désactiver lesdits moyens de signalisation; vérifier, à l'occasion de chaque exécution de l'opération sensible et en amont de ladite première séquence supplémentaire d'opérations (22), si les moyens de signalisation sont désactivés; interdire, dans le cas où les moyens de signalisation sont activés, l'exécution de l'opération sensible.

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