群组密钥协商协议的安全性分析方法研究

Security Analysis Approaches for Group Key Agreement Protocols

群组密钥协商允许多个用户通过不安全的信道建立一个共享的会话密钥,设计安全的群组密钥协商协议是最基本的密码学任务之一。介绍了群组密钥协商协议的两类安全性分析方法:计算复杂性方法和形式化分析方法,详细讨论了计算复杂性方法中的关键技术,包括基于规约的证明技术及基于模拟的证明技术、基于规约的安全模型和基于模拟的安全模型,探讨了安全性分析方法的发展趋势。

Group Key agreement allows multi users to establish a common session key though insecure channels.Designing secure group key agreement protocols is one of the most fundamental cryptographic tasks.This paper introduced two approaches developed for analyzing security group key agreement protocols：computational complexity approach and formal analysis approach.The key technologies of computational complexity approach were discussed,including the proof technology based on reduction and simulatability,and security models based on reduction and simulatability.The trends in this field were presented.