Cryptography – Cellular telephone cryptographic authentication – Initialization
Reexamination Certificate
2005-09-27
2005-09-27
Barron, Gilberto (Department: 2132)
Cryptography
Cellular telephone cryptographic authentication
Initialization
C713S169000, C713S170000
Reexamination Certificate
active
06950521
ABSTRACT:
A method for improving an established Authentication and Key Agreement procedure which prevents rogue mobiles from fraudulently gaining access to a communication system. The communication system periodically broadcasts a challenge interrogation message requesting that a mobile, which is currently validated to use the system, to authenticate itself to the system. The mobile computes an authentication response based on information known only to the communication system and the USIM of the mobile and transmits said response to the communication system. The communication system also computes an authentication response and compares said response with that received from the mobile. A mobile is authenticated by the communication system when the two authentication responses are equal. Otherwise, the mobile is not given access to the communication system.
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Marcovici Michael
Mizikovsky Semyon B
Barron Gilberto
Kim Jung W
Lucent Technologies - Inc.
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