In order to further reduce the communication complexity, the DGR algorithm is improved on by generating a cluster dynamically in the rekeying process, and the CDGR (cluster distributed group rekeying algorithm) is proposed.

• 为了进一步降低算法的通信代价；通过在组密钥更新时动态生成组密钥更新簇；对DGR算法进行了改进；提出了CDGR(cluster distributed group rekeying)算法；并讨论了上述算法的安全性、正确性和完备性；分析了算法的通信代价.