Method for authentication and protection of subscribers in...

H - Electricity – 04 – L

Patent

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Details

H04L 9/32 (2006.01) H04M 3/42 (2006.01) H04Q 7/22 (2006.01) H04Q 7/38 (2006.01)

Patent

CA 2087433

Radio frequency based cellular telecommunication systems often require a subscriber (10) to maintain a proprietary identifier (19) or serial number (18) which is transmitted to a fixed network communication unit (20) to verify the authenticity of the subscriber (10). An enciphering and call sequencing method is provided which can decrease unauthorized detection of these proprietary ID's (18, 19). This method permits efficient roaming by allowing authentication variables for multiple calls to be sent from the "home" system (20) to the "visited" system and stored by the "visited" system for use with subsequent calls. Further, a method is provided which forces the authenticating mobile (10) to use information that only it has available to itself. Furthermore, a method is provided which allows continued encryption integrity during handoffs by maintaining a record of pseudo random events between a subscriber unit (10) and any source radio communication unit (20) (e.g., the number of handoffs that the subscriber (10) has undergone during a given conversation).

Les systèmes de télécommunications cellulaires RF demandent souvent à un abonné (10) de maintenir un identificateur individualisé (19) ou un numéro de série (18) qui est transmis à une unité de communication de réseau fixe (20) afin de vérifier l'authenticité de l'abonné (10). Une méthode de chiffrement et de séquencement d'appels susceptible de diminuer la détection non autorisée de ces identificateurs (18, 19) est présentée. Elle assure l'efficacité d'itinérance en permettant la transmission, du système « d'origine » (20) au système « visité », de variables d'authentification pour des appels multiples et le stockage de ces variables par le système « visité » aux fins d'appels ultérieurs. Une méthode forçant l'unité mobile authentificatrice (10) à utiliser de l'information dont elle est seule à disposer est également présentée. De plus, une méthode permettant de maintenir l'intégrité du chiffrement pendant les transferts en enregistrant les événements pseudo-aléatoires qui se produisent entre une unité d'abonné (10) et toute unité de radiocommunication source (20) (p. ex. le nombre de transferts associés à l'abonné (10) pour une conversation donnée).

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