Method for protecting the decrypting of the configuration...

G - Physics – 06 – F

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G06F 21/02 (2006.01) G06F 21/00 (2006.01)

Patent

CA 2733546

The subject of the invention is a method for protecting a programmable logic circuit (100, 200), characterized in that the data file(s) used for the configuration of the programmable resources of the circuit are stored in a non-volatile memory (107, 207) after having been encrypted (112), a decryption module internal to the circuit (103, 203) being responsible for decrypting the file(s) by using a secret key (102, 202) stored in the circuit, the decryption module being protected against attacks aiming to obtain the key during the decryption operation by implementing at least one countermeasure technique. Another subject of the invention is a programmable logic circuit of FPGA type protected against observation and/or fault-injection attacks during the decryption operation by using the method according to one of the preceding claims. Figure 2

L'invention a pour objet un procédé de protection d'un circuit à logique programmable (100, 200) caractérisé en ce que le ou les fichiers de données utilisés pour la configuration des ressources programmables du circuit sont stockés dans une mémoire non volatile (107, 207) après avoir étés cryptés (112), un module de décryptage interne au circuit (103, 203) étant en charge de décrypter le ou les fichiers en utilisant une clé secrète (102, 202) stockée dans le circuit, le module de décryptage étant protégé contre les attaques visant à obtenir la clé pendant l'opération de décryptage en implémentant au moins une technique de contre-mesure. L'invention a aussi pour objet circuit à logique programmable de type FPGA protégé contre les attaques par observation et/ou injection de fautes pendant l'opération de décryptage en utilisant le procédé selon l'une des revendications précédentes.

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