目前大部分基于身份的三方认证密钥协商协议都存在安全缺陷,文中在Xu等人提出的加密方案的基础上,设计了一种基于身份的三方认证密钥协商协议.该协议的安全性建立在BDDH假设基础上,经安全性分析,协议具有已知密钥安全,PKG前向安全,并能抵抗未知密钥共享攻击和密钥泄露伪装攻击,因此该协议是一个安全的三方密钥协商协议.
Now,most of the tripartite authenticated key agreement protocols have been proven to be insecure.We design the new identity-based tripartite authenticated key agreement protocol,it is based on the secure IBE scheme by Peng.This protocol's security based on bilinear decisional Diffie-Hellman assumption.This protocol could provide known key security,PKG forward secrecy,key-compromise impersonation resilience and unknown key-share resilience,so it's a secure tripartite authenticated key agreement protocol.