关键词: 无线传感器网络, 密钥管理, 密钥分配, 二次型, 特征值, 特征向量

Abstract: Concerning the existing problems in the current key management strategies, lower connectivity, higher storage consumption and communication cost, this paper proposed a mixed key management scheme based on domain for Wireless Sensor Network (WSN). The scheme divided the deployment area into a number of square areas, which consisted of member nodes and head nodes. According to their pre-distribution key space information, any pair of nodes in the same area could find a session key, but the nodes in different areas could only communicate with each other through head nodes. The eigenvalues and eigenvectors of the multiple asymmetric quadratic form polynomials were computed, and then the orthogonal diagonalization information was got, by which the head nodes could achieve identification and generate the session key between its neighbor nodes. The analysis of performance shows that compared with the existing key management schemes, this scheme has full connectivity and a bigger improvement in terms of communication overhead, storage consumption and safety.

Key words: Wireless Sensor Network (WSN), key management, key distribution, quadratic form, eigenvalue, eigenvector