适用于传感器网络的分级群组密钥管理

Leveled Group Key Management for Wireless Sensor Networks

由于无线传感器网络中经常出现节点加入或离开网络的情况,所以需要建立一种安全高效的群组密钥管理系统来保证无线传感器网络中群组通信的安全性.提出了一种基于密钥树和中国剩余定理的分级群组密钥管理方案.有sensor节点加入,先向新成员发送二级群组密钥,可参与一些不太敏感的数据的传送;待新成员获得GCKS的信任之后,则向其发送群组密钥,从而可参与有关机密信息的会话.节点离开时,通过利用完全子集方法将剩余成员进行分割,提出的方案可以利用中国剩余定理对群组密钥进行安全的更新.证明方案满足正确性、群组密钥保密性、前向保密性和后向保密性等安全性质.性能分析表明,此方案适合应用于无线传感器网络环境.

Since the sensor nodes join or leave the wireless sensor networks （WSNs） frequently,it is necessary to build a secure and efficient group key management system. Based on the key tree and the Chinese remainder theorem, a leveled group key management scheme is proposed. The new sensor may transmit some not sensitive messages by the sublevel group key sent to it, and a group key is sent to the new sensor so as to let it join the WSN in deed after it gets the trust of GCKS. In the leave event, the remaining nodes in the key tree are partitioned by the complete subset method. Then the group key can be updated securely by the method based on Chinese remainder theorem. F＇mally, we show that the proposed scheme satisfies the desired security properties, such as correctness, group key secrecy, forward secrecy and backward secrecy. The performance analysis shows that the proposed scheme is be applicable to WSNs.