Cryptoprocessor with improved data protection

Details Cryptoprocessor with improved data protection Cryptoprocessor with improved data protection

G - Physics

06

F

G06F 21/02 (2006.01)

Patent

CA 2687582

The invention relates to an electronic circuit (30) comprising: a first random-access data storage element (14), a processing module (16) designed to delete the first storage element, and an access terminal (B4) which is connected to the processing module and receives a first power signal (VDD_BU) supplied by a first power source (P, C1) external to the electronic circuit. The circuit also includes a second random-access storage element (32) in which a key is stored, said key being used to encrypt the data, and a second power source (C2) which is built into the electronic circuit and supplies a second power signal (VAl) to the processing module. The processing module is designed to detect an unauthorised access attempt by comparing the first and second power signals and to delete the key when the processing module is powered by the second power source.

L'invention concerne un circuit électronique (30) comprenant une première mémoire vive (14) de stockage de données; un module de traitement (16) adapté à effacer la première mémoire; et une borne d'accès (B4) reliée au module de traitement et recevant un premier signal d'alimentation (VDD_BU) fourni par une première source d'alimentation (P, C1) externe au circuit électronique. Le circuit comprend, en outre, une seconde mémoire vive (32) dans laquelle est stockée une clé, lesdites données étant cryptées en mettant en oeuvre ladite clé; et une seconde source d'alimentation (C2) intégrée au circuit électronique et fournissant un second signal d'alimentation (V Al) au module de traitement. Le module de traitement est adapté à détecter qu'une tentative d'accès non autorisé a lieu à partir de la comparaison des premier et second signaux d'alimentation et à effacer ladite clé tandis que le module de traitement est alimenté par la seconde source d'alimentation.

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