中文摘要：

在充分分析安全电子交易的前提下，针对目前流行的SET标准协议进行分析，指出了SET协议在交易过程中的各种缺陷，进而提出了SSET协议，并对SSET协议的工作流程进行详尽阐述。SSET协议增强了原有SET协议的安全性和不可否认性，满足了交易原子性、隐私保护性，并提出了信用等级制度和纠纷仲裁机制，完善了电子交易的整个过程，切实保护了各方利益。

英文摘要：

After a full analysis of electronic transaction security, this paper analyzed the SET standard protocol which is popular at present, and pointed out the flaws of the SET protocol in transaction process, then proposed the SSET protocol, and gave an exhaustive elaboration on the work flow of the SSET protocol. The SSET protocol has strengthened the security and non-re- pudiation of the original SET protocol, and satisfied atomic transactions, the privacy safeguarding, and proposed the credit hierarchical system and the dispute arbitrate mechanism, The SSET protocol has also improved the entire process of electronic transaction and practically safeguarded all quarter＇s benefit.