Authentication system for digital cellular communications

H - Electricity – 04 – L

Patent

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Details

H04L 9/16 (2006.01) H04K 1/02 (2006.01) H04L 9/32 (2006.01) H04Q 7/36 (2006.01) H04Q 7/38 (2006.01)

Patent

CA 2087722

A system for the authentication of mobile stations and base stations in a cellular communications network. The system includes an algorithm which generates not only a key dependent response to a random challenge, but also a temporary conversation key or call variable which may be used to encipher traffic in the network. To protect against clones in the network, the algorithm uses a rolling key which contains historical information. A bilateral authentication procedure may be used to update the rolling key and to generate a new conversation key.

Système d'authentification de stations mobiles et de stations de base dans un réseau de télécommunications cellulaires. Le système comprend un algorithme qui, à la suite d'une interrogation aléatoire, génère non seulement une réponse dépendant d'une clé, mais aussi une clé temporaire pour la conversation ou une variable d'appel, qui peut servir à chiffrer le trafic du réseau. Pour se protéger contre des clones dans le réseau, l'algorithme se sert d'une clé à codage roulant qui contient de l'information antérieure. Une procédure d'authentification bilatérale peut être utilisée pour mettre à jour la clé et pour générer une nouvelle clé pour la conversation.

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