Method for secure communication between two devices

Details Method for secure communication between two devices Method for secure communication between two devices

H - Electricity

04

L

H04L 9/08 (2006.01) H04N 7/167 (2006.01)

Patent

CA 2444422

A method for secure communication of information between a first (25) and second module (26) whereby each module contains one of the keys of the two couples (30, 32; 31, 33) of keys, wherein a first number S and a second number A1 are randomly generated in the first module (25), a third number A2 is randomly generated in the second module (26) and wherein symmetrical verification occurs as to whether a random number (S, A1, A2) encrypted by one (25, 26) of the modules, decrypted by the other (25, 26) and retransmitted in an encrypted manner to one of said modules (25, 26) is identical to the initial random number after decryption, whereby a common session key K is autonomously created (43, 44) in each of the modules with at least three of the same numbers (S, A1, A2).

Procédé de transmission sécurisée d'informations entre un premier (25) et un second (26) modules contenant chacun l'une des clés de deux couples (30, 32; 31, 33) de clés, dans lequel on génère de façon aléatoire un premier S et un second A1 nombres dans le premier module (25), un troisième nombre A2 dans le second module (26), et où : on vérifie de façon symétrique qu'un nombre aléatoire (S, A1, A2) chiffré par l'un (25, 26) des modules puis déchiffré par l'autre (25, 26) et retransmis chiffré à nouveau à l'un (25, 26) est après déchiffrement dans ce module (25, 26) identique au nombre aléatoire initial, on crée (43, 44) de façon autonome dans chacun des modules une clé commune de session K avec au moins trois mêmes nombres (S, A1, A2).

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