A New Key Management Scheme in Clustering Wireless Sensor Networks

Extension of life cycle has been one of the hot spots in Wireless Sensor Networks. Owing to limited capacity nodes fail as soon as energy is consumed, which tends to shorten survival time of entire wireless sensor network. Therefore, a clustering key management scheme based on hierarchical tree is proposed, furthermore dynamic update of networks is realized in the paper. In the hierarchical tree, child keys can be calculated according to their parent key, and nodes of different importance can be protected distinctively. The results show that it can not only ensure security of networks but also reduce the communication traffic, lower network overhead, and prolong life cycle of networks.