摘要： 介绍了密码协议的设计准则，并通过具体实例加以说明。针对公钥协议，特别是协议中的签名和加密顺序问题，指出了某些准则的局限性。

关键词: 密码协议, 安全性, 设计准则

Abstract: This paper introduces the design principles for cryptographic protocols through specific examples, and points out their limitations on public key protocols, especially on the order of signature and encryption.

中图分类号: 

• TP393.08