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椭圆曲线密码体制是公钥密码体制中的安全体制之一,其安全性基于有限域上离散对数的难解性。Diffie-Hellam在该密码体制之上提出了第一个公开的密钥交换协议,即Diffie-Hellam的密钥协商协议。但Diffie-Hellam的密钥协商协议存在缺陷和漏洞,极为不安全。提出了2种改进的密钥协商协议,并进行了安全性分析。结果证明,该协议是安全可靠的,能够更好的防止攻击者篡改、抵赖和伪造消息,而且使用简单方便、步骤清楚。
Elliptic curve cryptosystem is one of the security systems in public-key cryptosystem. Its security is based on the difficulty of discrete logarithm on finite field. Diffie-Hellam proposed the first public key exchange protocol, Diffie-Hellam’s key agreement protocol, over this cryptosystem. However, Diffie-Hellam’s key agreement protocols are flawed and flawed and are extremely insecure. Two improved key agreement protocols are proposed and the security analysis is carried out. The result proves that this protocol is safe and reliable, and can better prevent attackers from tampering, denying and forging messages. Moreover, the protocol is easy to use and has clear steps.