Method for implementing a private key communication protocol...

H - Electricity – 04 – L

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H04L 9/30 (2006.01) G07F 7/10 (2006.01) H04L 9/06 (2006.01)

Patent

CA 2208983

A method for implementing private key protocols between two processing devices of which at least one is a portable storage medium. The devices are fitted with a digital processing circuit for performing modular calculation operations with a view to executing operations such as modular multiplication, the processing circuit is used to implement a private key encryption function consisting of a series of reversible operations comprising at least a combination of two operations, i.e. a modular calculation operation and a binary logic operation, and said function is applied either for encrypting or signing messages to be transmitted, or for decrypting received messages.

L'invention concerne un procédé pour la mise en oeuvre de protocoles à clef secrète entre deux dispositifs de traitement, l'un d'entre eux au moins étant un support de mémorisation portable. Selon l'invention on équipe les dispositifs d'un circuit de traitement numérique apte à réaliser des opérations de calcul modulaire pour la mise en oeuvre d'opération telles que la multiplication modulaire, on utilise ce circuit de traitement pour mettre en oeuvre une fonction de chiffrement à clé secrète composée d'une succession d'opérations réversibles comportant au moins la combinaison de deux opérations, l'une de type calcul modulaire et l'autre relevant de la logique binaire, et on applique cette fonction soit sur des messages destinés à être transmis pour les chiffrer ou les signer, soit sur des messages reçus pour les déchiffrer.

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