Devices for hiding operations performed in a microprocessor...

Details Devices for hiding operations performed in a microprocessor... Devices for hiding operations performed in a microprocessor...

G - Physics

06

K

G06K 19/073 (2006.01) G06F 1/00 (2006.01) G06F 21/00 (2006.01) G06K 19/07 (2006.01) G07F 7/10 (2006.01) H04L 9/06 (2006.01)

Patent

CA 2323006

The invention concerns microprocessor cards and, in such cards, various devices for hiding operations performed in the card against fraudulent breaches by analysing the current consumed. The invention is characterised in that it consists in adding in the card a device (20) modifying the consumed current, either by averaging it by integration, or by adding thereto random values by a random signal generator (28) so as to hide the operations performed. In another embodiment, it consists in carrying out simultaneously an operation for making secure and writing in an EEPROM memory, the latter generating chaotic current variations which hide the operation to be made secure.

L'invention concerne les cartes à microprocesseur et, dans de telles cartes, différents dispositifs pour masquer les opérations effectuées dans la carte contre les intrusions frauduleuses par l'analyse du courant consommé. L'invention réside dans le fait d'ajouter dans la carte un dispositif (20) qui modifie le courant consommé, soit en le moyennant par une intégration, soit en lui ajoutant des valeurs aléatoires par un générateur de signaux aléatoires (28) de manière à masquer les opérations effectuées. Dans une variante, il est prévu d'effectuer simultanément une opération à sécuriser et l'écriture dans une mémoire EEPROM, cette dernière créant des variations de courant chaotiques qui masquent l'opération à sécuriser.

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