基于单向函数的多权限群组密钥管理协议

Multi-privileged Group Key Management Protocol Based on One-way Function

多权限组播通信存在多个数据流且组播组中用户权限因获得数据流的不同而不同,其安全问题较难处理。该文提出一种针对多权限组播通信的高效的密钥管理协议,为密钥图中的每个节点分配一个ID,根据节点ID之间的特殊关系,组播组中的用户只要知道密钥图中加入/退出/改变权限节点的ID便可利用单向函数计算出新的密钥,减少了服务器的密钥更新开销。模拟结果表明,与MGKMS协议相比,该协议最多可以减少70%的密钥更新开销。

Security is difficult to handle in multi-privileged group communications,because group users have multiple access privileges when subscribing different data streams.This paper proposes an efficient group key management protocol in multi-privileged group communications.The protocol assigns a unique ID to each node on key graph.With the special relationship among the nodes＇ IDs,group users can deduce the new keys with one-way function according to the ID of joining/leaving/changing node on the key graph,thus the protocol can greatly reduce the rekeying overhead.Simulation results show that compared with the MGKMS protocol,the protocol can reduce the rekeying overhead by 70% in the best case.