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首先分析研究了ＧＳＭ（Ｇｌｏｂａｌｓｙｓｔｅｍ ｆｏｒ ｍ ｏｂｉｌｅ）数字移动通信系统的安全技术，特别是有关用户鉴权与密钥分配的协议，然后以改进的ＦＥＡＬ算法为核心，构造了一个２Ｍ 比特并联杂凑ＦＥＡＬ－４（Ｘ）Ｓ加密算法，实现了ＧＳＭ 数字移动通信系统的身份认证与密钥分配的Ａ３／Ａ８ 算法。本文对该组加密算法及其性能进行了详细分析，并给出了在计算机上模拟的结果。
Firstly, the security technology of GSM (Digital Globalsystem for m obile) digital mobile communication system is analyzed and studied, especially the protocol about user authentication and key distribution. Then, a modified 2-D parallel hash FEAL- 4 (X) S encryption algorithm to realize the A3 / A8 algorithm of identity authentication and key distribution of GSM digital mobile communication system. In this paper, the group of encryption algorithms and their performance are analyzed in detail, and the results of computer simulation are given.