Generation of a seed number

H - Electricity – 04 – Q

Patent

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Details

H04Q 7/38 (2006.01) H04L 9/30 (2006.01)

Patent

CA 2309666

Method for computing the key to an encryption algorithm used to encrypt messages to be transmitted over a telecommunication network and for generating the seed number needed for the computation of the encryption key. According to the invention, the seed number used is a number computed from a random number generated by the authentication centre of the mobile communication network, and the encryption key is computed using the authentication algorithm from the seed number and a subscriber identification key.

La présente invention concerne un procédé permettant de calculer la clé d'un algorithme cryptographique utilisé pour chiffrer les messages devant être transmis sur un réseau de télécommunications et pour générer la valeur de départ nécessaire au calcul de la clé de cryptage. Dans la présente invention, la valeur de départ utilisée est un nombre calculé à partir d'un nombre aléatoire généré par le centre d'authentification du réseau de communication mobile, et la clé de cryptage est calculée à l'aide de l'algorithme d'authentification à partir de la valeur de départ et d'une clé d'identification d'abonné.

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