A METHOD OF SELECTING ENCRYPTING ARITHMETIC FOR REALIZING COMMUNICATION OF SECRECY

摘要

A method for implementing security communication by independently selecting an encryption algorithm is disclosed. In this method, a bit for representing CI is added, and a judge process for the CI and encryption algorithm supported by both the current subscriber and network is added. ??Under the condition that CN supports more than one encryption algorithm, if the CI is 1 and a standard encryption algorithm is supported by both UE and CN, the standard encryption algorithm is determined as the encryption algorithm for security communication; otherwise, the communication is disconnected; if the CI is 0 and a self-developed non-standard encryption algorithm is supported by both UE and CN, the encryption algorithm is determined as the encryption algorithm for security communication; otherwise, the communication is disconnected. ??Under the condition that CN only supports the standard encryption algorithm, if this algorithm is also supported by UE, this standard encryption algorithm is determined as the encryption algorithm for security communication directly; otherwise, the communication is disconnected. ??This method enables the subscriber to perform security communication utilizing effective encryption algorithm anywhere and satisfies the requirement for independently selecting encryption algorithm in local area. Accordingly, the subscriber interest and service quality is guaranteed. IMAGE