A new key management scheme based on secret information for WSN

This paper presented a new key management scheme based on secret information for wireless sensor network (WSN). The base station calculated the polynomial formed by the secret information of the nodes to generate a global network key, through which the nodes could certify the legitimate nodes in the network. The nodes generated the unique session keys between the neighbor nodes through the global network key after Diffie-Hellman key exchange. Nodes updated the session key with its neighbor nodes through broadcasting the intermediate parameter of session key, which could reduce the communication overhead effectively. The analysis of performance show that this scheme has a lower storage cost, a lower communication overhead, good scalability and connectivity, compared to some existing pre-distribution schemes.