The paper concisely analysed five typical group key agreement protocols put forward in recent years, they are: centralized key distribution (CKD), burmester-desmedt (BD), steer et al.

• 简要分析了近几年提出的适合这种通信方式的5种组密钥协商协议；即CKD(centralized key distribution)协议、BD(burmester-desmedt)协议、STR(steer； et al.；)