Abstract: A dynamic multiple cluster key management model based on identity was designed in wireless sensor network. The key management in the model is cluster-based. Every node in the network is just rectuired to store its private key and the public key factor matrix of the cluster that it belongs to, which consumes little storage space and can resist the collusion attack. The key distribution is secure and effective. It costs little during the node joining and leaving. And it realizes the identity authentication independent of the third party and has no use for infrastructure to sustain the key distribution center. A secure data aggregation solution based on the model was proposed. Security of the proposed solulion was analyzed and some attacks that can be resisted were listed. The energy consumption during the handshaking process was discussed, which indicates that it is feasible to use the identity-based cryptography in the wireless sensor networks.

Key words: Wireless sensor networks,Data aggregation,IBE,Cryptography