Patent ID: 7751567
Filing Date: 2010-07-06
Classification: H04L,H04W

Abstract:
1. A subscriber identification token for providing local authentication of a subscriber in a visited communication system, comprising: a memory; and a processor configured to implement a set of instructions stored in the memory, the set of instructions for: generating a plurality of keys in response to a received challenge, where at least one key from the plurality of keys is an integrity key that is provided to a communication unit communicatively coupled to the subscriber identification token and at least one key from the plurality of keys is an authentication key that is kept private from the communication unit; generating an authentication signal based on a received signal and the authentication key from the plurality of keys, wherein the received signal is transmitted from the communications unit communicatively coupled to the subscriber identification token, and the received signal is generated by the communications unit using the integrity key from the plurality of keys; and transmitting the authentication signal to the visited communication system via the communications unit, the authentication signal for authenticating the identity of the subscriber within the visited communication system.