| 摘要 |
The invention relates to a method and system for performing an authentication, preferably between an user equipment and a network entity of a communication network wherein sequence numbers are used for generating an authentication information which may be transmitted to the user equipment for authentication purpose. The sequence numbers are generated on the basis of a general information changing in a defined manner such as a global clock, and a value stored in a database. For reducing the number of database writing operations, the value is used several times for generating several different sequence numbers. The user-specific value may be calculated based on the difference between a previously used or predetermined sequence number and the general information, and is changed only in a re-synchronisation procedure. Such a re-synchronisation procedure may be performed when the difference between the user-specific value and the general information exceeds a certain limit, or when the previously used or predetermined sequence number is larger than the general information. |
