Abstract: A secure key distribution protocol for WSN is put forward based on cluster—SEKD，which can afford deterministic security and reduce networks energy consumption and the storage cost compared with existing typical secure protocols.SEKD agreement can efficiently and dynamically set up cluster key for each clusters，and distribute cluster key by cluster head one-time local broadcasting based on the difficulty of factorization of polynomial，and maximize saving communication and encryption-decryption cost.Because of multi-hop routing，SEKD uses multiple encryption to guarantee the security of the data.Performance analysis and simulation results show that，under the premise of meeting the security requirements，SEKD can efficiently set up cluster and inter-cluster key for WSN，significantly lower network energy consumption，and extend the network survival time.

摘要： 提出了一种基于分簇结构的无线传感器密钥安全分发协议——SEKD协议，与现有典型分簇结构的安全协议相比，能够提供确定的安全性并显著地降低了网络能耗、存储开销。SEKD协议可以高效动态地为每个簇建立簇密钥，并基于因式分解的困难性，通过簇首一次广播即可实现簇密钥的安全分发，最大程度地节约了通信量和加密解密开销。由于多跳路由数据包，SEKD协议采用多重加密保证了数据的安全性。性能分析和仿真实验显示，SEKD协议在满足安全需求的前提下，能为无线传感器网络高效建立簇密钥与簇间密钥，并显著降低网络能耗，进一步延长网络的生存时间。