Ciphering between a cdma network and a gsm network

H - Electricity – 04 – W

Patent

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H04W 12/06 (2009.01) H04W 8/02 (2009.01)

Patent

CA 2521044

Shared secret data is used to authenticate and encrypt between a CDMA network and a GSM network such that a mobile station having a subscription in a GSM network can roam into a CDMA network and be authenticated to use the CDMA network and have messages encrypted without having a CDMA subscription. The goal of authenticating a GSM subscriber in a CDMA network using GSM authentication credentials is achieved by substituting a key Kc as SSD-A and messages are encrypted substituting Kc as SSD-B using a CAVE algorithm.

Des données secrètes partagées sont utilisées pour l'authentification et le chiffrement entre un réseau CDMA et un réseau GSM, si bien qu'une station mobile possédant un abonnement à un réseau GSM peut se déplacer dans un réseau CDMA, peut être authentifiée comme utilisant le réseau CDMA et voir ses messages chiffrés sans qu'elle soit abonnée au CDMA. L'authentification d'un abonné GSM dans un réseau CDMA utilisant les justificatifs d'authentification est assurée par la substitution d'une clé Kc à SSD-A et les messages sont chiffrés par substitution de Kc à SSD-B au moyen d'un algorithme CAVE.

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