Abstract: For building all kinds of distributed and collaborative applications in dynamic peer environments, robust and secure group communication systems have been becoming more and more significant. Recently, research on the field mainly focuses on the security of the key agreement protocols and their implementation efficiency. However, few researches on robustness have been conducted. This paper first describes a generic model of robust and secure group communication systems. Then, several typical distributed group key agreement protocols are selected from many protocols, which can work well in dynamic peer environment. The process of asynchronous network events and dynamic group membership are elaborated. Based on this, this paper analyzes the different robustness of these protocols, and clarifies how to construct a robust and secure group communication system with these protocols.

Key words: distributed group key agreement, robustness, dynamic peer group

摘要： 健壮和安全的组通信系统已成为在动态对等环境下构建各种协同及分布式应用的迫切需要，但目前这方面的研究多集中在组密钥协商协议的安全性和实现的效率方面，而对于健壮性的研究较少。提出了一种健壮的安全组通信系统一般模型，同时从许多协议中选取了几种适合该模型的、能够有效支持动态对等环境的分布式组密钥协商协议，描述了它们对各种异步网络事件和组成员关系变化的处理过程。在此基础上，探讨了它们不同的健壮性，并阐明了利用它们来构建健壮、可靠和安全的组通信系统的基本思路。

关键词: 分布式组密钥协商, 健壮性, 动态对等组