簇状传感器网络临时分类密钥管理协议

提出了一种基于密钥树的簇状传感器网络临时分类密钥管理方法.采用DH密钥协商算法和逻辑密钥树分发节点间通信使用的三类密钥；使用事件激发来启动密钥系统更新，以确保网络拓扑变化时的密钥安全.实验表明密钥协商算法适当地增加计算量，但有效地降低了通信负载，并且减少了密钥占用的存储空间；动态更新策略能自适应网络拓扑变化，提高了密钥系统的安全性.

Transitory Classified Keys Management for Clustered Wireless Sensor Network

A transitory classified keys management based on LKH (logical key hierarchy) was presented for clustered WSN (wireless sensor network). In the method, Diffie-Hullman keys agreement and LKH were used to distribute three types of keys which would be referred in the communications between nodes. The event-trigger based dynamic update strategy was launched to secure keys when network’s topology varies. The experiment shows that the key agreement efficiently reduces the communication and storage with slight calculation overload, and dynamic update strategy accommodates to the network topology changes and improves system’s security.