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针对密钥更新理论在传感器网络中存在更新速度慢、更新范围过大、能耗多等问题,提出两级密钥更新理论.基站到簇头采用单播方式,且更新对于每个簇头具有唯一性和差异性;簇内节点采用基于多项式的广播更新方式.新方法借鉴了时隙顺序认证思想,通过预存密钥生成会话密钥,没有过多增加存储开销,降低了多项式的阶数和节点的运算量,暴露密钥更新快,保证密钥池大小不变且安全,保证网络具有好的连通性能,延长了网络寿命.仿真结果表明,密钥更新快,更新时的能量消耗可以承受.
Aiming at the problem that the key update theory exists in the sensor network, such as slow update speed, excessive update range and high energy consumption, a two-level key update theory is proposed.Universal base station to cluster head adopts unicast mode, Uniqueness and diversity of nodes in the cluster.The nodes in the cluster adopt the polynomial-based broadcast updating method.The new method draws on the idea of time slot sequence authentication and generates the session key by prestoring the key, without excessively increasing the storage overhead and reducing the order of the polynomial The computational complexity of the nodes and the exposure keys are updated quickly to ensure the size and security of the key pool and ensure good connectivity of the network and prolong the life of the network.The simulation results show that the key renewal is fast and the energy consumption in updating can be tolerated .