关键词: 无线传感器网络, 密钥管理, 能量树, Blom矩阵

Abstract: Effective key management scheme is the foundation for the secure communication of wireless sensor networks.A key management scheme for hierarchical wireless sensor networks is proposed，which takes advantages of the proposed energy-aware tree to balance energy consumption of cluster nodes.All the nodes in the network are organized in an energy-aware tree，the edges of which carry weight decided by the remaining power of the nodes.The root of each tree distributes different messages to the nodes according to the edges’ weight.To enhance the security of cluster heads，Blom matrix was adopted in generating inter-cluster keys.Analysis shows that the proposed scheme can effectively save the constrained energy of sensor nodes，provide high scalability of the network as well as network resilience ability.

Key words: wireless sensor network, key management, energy-aware tree, Blom matrix