Cryptography – Cellular telephone cryptographic authentication
Reexamination Certificate
2011-01-18
2011-01-18
Lanier, Benjamin E (Department: 2432)
Cryptography
Cellular telephone cryptographic authentication
C380S044000, C380S045000, C380S249000, C380S259000, C380S260000, C380S270000, C380S273000
Reexamination Certificate
active
07873163
ABSTRACT:
In a communication system (100), a method and apparatus provides for message integrity regardless of the operating version of an authentication center (198) or an interface (197) between the authentication center (198) and a mobile switching center (199). The method and apparatus include generating a cellular message encryption algorithm (CMEA) key, and generating a CMEA-key-derived integrity key (CIK) based on the CMEA key for message integrity between a mobile station and a base station. The mobile station transmits a registration message to the base station, and determines an operating version of the authentication center (198) in communication with the base station based on whether the mobile station receives a registration accepted order or some elements of an authentication vector from the base station. The CIK is generated based on the CMEA key, if the mobile station receives a valid registration accepted order from the base station.
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Duncan Ho Sai Yiu
Quick, Jr. Roy Franklin
Beladi Sayed Hossain
Kim Won Tae C
Lanier Benjamin E
Qualcomm Incorporated
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