Using formal method to analyze security protocol is a valid method to the analysis of security protocols. In recent years, a lot of formal methods appeared.

采用形式化方法分析安全协议是协议分析的有效手段，近年来，出现了众多的研究方法。

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So the design and analysis of cryptographic protocols are the troubles of information security.

因此密码协议设计和密码协议分析是信息安全领域的难题。

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This paper first presents the security analysis of two verifier-based password-authenticated key exchange protocols for three-party and points out that they are both insecure.

首先对两个基于验证元的三方口令密钥交换协议进行了安全性分析，指出它们都是不安全的。

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