无线传感器网络中一种改进的对密钥更新方案*

无线传感器网络在使用过程中，部分节点会由于环境因素或能量耗尽而失效，为了弥补这些失效节点，网络中的节点数可以动态地增加或减少，为了保证网络的安全性，提出了一种改进的对密钥更新方案。该方案是在传感器网络中一种可靠的对密钥更新方案基础上提出的，借助Blom矩阵，能够随着网络的动态变化而动态管理密钥，从而防止了密钥的泄露。同时与可靠的对密钥更新方案相比，在保证网络安全和连通性的条件下，减小了存储空间和计算开销。

Improved pairwise key-updating scheme for wireless sensor network

When wireless sensor networks were working, some nodes failed because of environment or energy factors. In order to recuperate the networks,evicted the sensor nodes out of the networks and added some new nodes to the networks.Based on the reliable pairwise key-updating scheme,this paper proposed the scheme to protect the networks security. The scheme can extend and shrink the keys by Blom matrix with the network topology changes to prevent the adversary from utilizing the captured keys. Comparison the reliable pairwise key-updating scheme, the scheme can outperforms in terms of memory and computation overhead.