Abstract: The secure distribution of the key is an important process of keeping the security of communication by using cryptographic technology. This paper introduces a protocol integrating Diffie-Hellman protocol into the digital signature standard, points out its weakness in perfect forward secrecy, proposes a new key exchange protocol and analyses its security and efficiency briefly.

Key words: Key exchange, Digital signature, Digital signature standard(DSS), Discrete logarithm

摘要： 密钥的安全分配是采用密码技术保证通信安全的重要环节，文章介绍了一种将DSS签字标准与Diffie-Hellman协议相结合的密钥交换协议，指出其在前向安全性上的不足。在此基础上，提出了一种密钥交换协议设计方案，并对其安全和计算量作了简要分析。

关键词: 密钥交换, 数字签名, 数字签字标准, 离散对数