Method for secure data exchange between two devices

Details Method for secure data exchange between two devices Method for secure data exchange between two devices

H - Electricity

04

L

H04L 9/08 (2006.01) H04N 7/16 (2006.01)

Patent

CA 2488837

This invention concerns a safe data exchange method between two devices locally connected to one another. In a preferred embodiment, the first device (10) is a security module containing a first encrypting key, said private key (PAKV) of a pair of asymmetric encrypting keys. The second device is a receiver (11) comprising at least one second encrypting key, said public key (PAKB) of said pair of asymmetric encrypting keys. Furthermore each of the devices comprises a symmetrical key (13). The first device (10) generates a first random number (A), which is encrypted by said private key (PAKV), then transmitted to the second device (11), in which it is decrypted by means of the public key (PAKB). The second device (11) generates a second random number (B), which is encrypted by said public key (PAKB), then transmitted to the first device (10), in which it is decrypted by means of the private key (PAKV). A session key (SK), used for safe data exchange, is generated by a combination of the symmetric key (13) and the random numbers (A, B) generated and received by each of the devices.

La présente invention concerne un procédé d'échange sécurisé d'informations entre deux dispositifs localement connectés entre eux.Dans un mode de réalisation préféré, le premier dispositif (10) est un module de sécurité contenant une première clé de chiffrement, dite clé privée (PAKV) d'une paire de clés de chiffrement asymétriques. Le second dispositif est un récepteur (11) comportant au moins une seconde clé de chiffrement, dite clé publique (PAKB) de ladite paire de clés de chiffrement asymétriques. Chacun des dispositifs comporte en outre une clé symétrique (13). Le premier dispositif (10) génère un premier nombre aléatoire (A) qui est chiffré par ladite clé privée (PAKV), puis transmis au second dispositif (11), dans lequel il est déchiffré au moyen de la clé publique (PAKB). Le second dispositif (11) génère un second nombre aléatoire (B) qui est chiffré par ladite clé publique (PAKB), puis transmis au premier dispositif (10), dans lequel il est déchiffré au moyen de la clé privée (PAKV). Une clé de session (SK), utilisée pour les échanges sécurisés d'informations, est générée par une combinaison de la clé symétrique (13) et des nombres aléatoires (A, B) générés et reçus par chacun des dispositifs.

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