facing the character of the distributed application system, the paper researches the security problem in the transmitting data through network, and invented a new encryption and decryption algorithm and secret key managing system . the algorithm is used in the system and satisfied the security need of the system 针对分布式应用系统的特点,研究了网络数据传输过程中的安全问题,研制了一种数据加解密算法及其密钥管理体系,应用于系统远程登录功能中,满足了网络数据传输的安全需要。