本文介绍了公钥密码机制实现数字签名的原理,结合基于挑战应答的动态口令认证机制,提出了一种基于数字签名的双向动态身份认证方案设计,最后对本方案进行了安全性分析。经分析得到该方案可以有效确认用户身份并可抵御截取连接的攻击、重放攻击等。 This paper introduces the principle of public key cryptography to realize digital signature. Combining with the dynamic password authentication mechanism based on challenge and response, this paper proposes a two-way dynamic identity authentication scheme based on digital signature. Finally, the security analysis of this scheme is carried out. The analysis shows that the scheme can effectively identify the user and can resist interception attacks, replay attacks and so on.