| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method and apparatus providing message integrity regardless of the operating version of an authentication center or an interface between the authentication center and a mobile switching center, in a communication system. Ž<P>SOLUTION: The method includes 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 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. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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