Research On Dynamic Key Management Scheme For Hierarchical Wireless Sensor Network

The technology of wireless sensor networks (WSNs for short) has attracted more and more interests from all over the world because its low cost, multi-function and extensive potential applications. The development of WSN has changed peoples' way of life and conceptions. Since wireless sensor networks are often deployed in hostile environments in many applications, security becomes the critical issue in WSN. Due to the limitation of the sensor nodes, traditional key management schemes are not suitable for it and existing protocols cannot provide sufficient security in many cases and a feasible and efficient key management scheme is an important guarantee for security communication.This paper first introduces the security problems and requirements faced by WSN nowadays. It also reviews the exit key management schemes for wireless sensor networks, and then analyses and compares the features and merits and faults of these schemes. According to the characteristics and requirements of wireless sensor networks, we propose a novel key management scheme for hierarchical wireless sensor networks -MSS. In this scheme, we combine the clustering structure of WSN with dynamic key management schemes, dividing the whole network into several clusters and providing key update mechanism. In this way, it can reduce the conception of nodes and meet the requirements of dynamic. There are two kinds of keys to encrypt the data. One is the session key shared between sensor nodes, the other is the master key shared between cluster head nodes and the base station. In our scheme, the sensor nodes use the preloaded information to generate the session keys in order to increase the resistance of captured attack. On the other hand, we adopt the main idea of threshold secret sharing scheme to enhance the security of the master key. This scheme divides the master key into several sub keys and each cluster head only keep the sub key, and the compromise of the cluster head won't release the message of the master key. Thus, it can provide strong security and resistance of captured attack. Compared to other key management schemes, our protocol has strong security and resistance of captured attack as well as low computational overhead and storage, and it also can meet the demands of the scalability. In the end, we propose a new key management scheme based ECC-KMSE, which is proposed on the base of KMSS and can provide high security and low conception.