Patent ID: 7107620
Filing Date: 2006-09-12
Classification: H04L,H04W

Abstract:
1. Authentication method for authenticating a mobile node to a packet data network, comprising the steps of: providing the mobile node with a mobile node identity and a shared secret specific to the mobile node identity and usable by a telecommunications network; providing the mobile node with a protection code; sending the mobile node identity and the protection code from the mobile node to the packet data network; providing the packet data network with authentication information usable by the telecommunications network, the authentication information comprising a challenge based on RAND codes of at least two authentication triplets of the telecommunications network, and a session secret corresponding to the mobile node identity and derivable using the challenge and the shared secret; forming cryptographic information using at least the protection code and the session secret; sending the challenge and the cryptographic information from the packet data network to the mobile node; checking at the mobile node the validity of the cryptographic information using the challenge and the shared secret; generating at the mobile node the session secret and a first response corresponding to the challenge, based on the shared secret; sending the first response to the packet data network; and checking the first response for authenticating the mobile node.