This paper implements the protocol extending ISO8583, and designs data encryption and key administration strategy based on ANSI X9.9, ANSI X9.8 and 3-DES.

• 在通讯协议设计和安全策略设计中；本文设计并实现了扩展标准ISO8583协议的增值服务通讯协议；及基于ANSI X9.；8和ANSI X9