Method and apparatus for authentication in a communication...

H - Electricity – 04 – L

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H04L 9/32 (2006.01) H04L 9/08 (2006.01) H04M 1/66 (2006.01)

Patent

CA 2198110

A method and apparatus for performing authentication in a communication system. The method includes the steps of detecting an unexpected authentication message, updating a counter value, comparing the counter value to a threshold value, and performing an encryption key update operation in response to the comparison between the counter value and the threshold value. The apparatus includes a base station (152), a switching center (128) coupled to the base station (152), and an authentication center (149) responsive to the switching center (128). The switching center (128) detects an unexpected authentication message received by the base station (152). The authentication center (149) updates a counter when the switching center (128) detects the unexpected authentication message and compares the updated counter with a threshold value. The authentication center (149) initiates an encryption key update operation when the updated counter value exceeds the threshold value.

L'invention concerne un procédé et appareil pour effectuer une authentification dans un système de communication. Le procédé consiste à détecter un message d'authentification non attendu, remettre à jour une contre-valeur, comparer la contre-valeur à une valeur de seuil et effectuer une opération de remise à jour de la clé de cryptage en réponse à la comparaison entre la contre-valeur et la valeur de seuil. L'appareil comprend un poste de base (152), un centre de commutation (128) couplé au poste de base (152) et un centre d'authentification (149) réagissant au centre de commutation (128). Le centre de commutation (128) détecte un message d'authentification non attendu reçu par le poste de base (152). Le centre d'authentification (149) remet à jour un compteur quand le centre de commutation (128) détecte le message d'authentification non attendu et compare le compteur remis à jour avec la valeur de seuil. Le centre d'authentification (149) initie une opération de remise à jour de la clé de cryptage quand la contre-valeur du compteur dépasse la valeur de seuil.

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