安全高效的WSN多级密钥管理方案

Secure and efficient multilevel key management scheme for wireless sensor networks

针对由无线传感器网络的开放性与资源局限性导致的密钥安全性和刷新效率问题,提出一种基于节点层次的多级密钥管理方案。采用节点的重要层次进行对网络结构进行划分,内层(第一层)安全级别最高,外层依次降低;根据不同的层次分配不同等级的密钥,确保只有高级密钥的节点才能获得同级或低级的节点间的数据访问权限;基于不同密钥的使用频率设计相匹配的高效多级密钥刷新协商协议。实验结果表明,与传统方案相比,所提方案在计算开销、存储开销和通信开销方面具有较好的优势,平均执行时间均在6 ms,增强方案的平均时延降低了约56%。

Aiming at the key security and update efficiency problems caused by the openness and resource limitation of wireless sensor networks,a multi-level key management scheme based on node hierarchy was proposed.The important levels of nodes were used to divide the network structure.The inner layer(the first level)had the highest security level,and the outer layer was decreased in sequence.Different levels of keys were assigned according to different levels,ensuring that only the node with the high level key could obtain the data access right between the nodes with the same level or the lower level.Based on the use frequency of different keys,a matching efficient multi-level key update negotiation protocol was designed.Experimental results show that,compared with the traditional scheme,the proposed scheme has better advantages in computation overhead,storage overhead and communication overhead.The average execution time is 6 ms,and the average delay of the enhanced scheme is reduced by about 56%.