Research Of Trust Node Technology In Wireless Sensor Network

The Wireless sensor networks (WSNs) are composed of a large amount of sensor nodes distributed in surveillance area that can communicate with each other and form a self-organization network system. Because of nodes'own characters, such as limited energy and storage space, and easy to be captured, WSNs not only have typical external security issues but also have some internal security problems. How to save energy and memory of the node and establish a trust wireless sensor network are the key issues of this paper.From the perspective of trust, this paper first proposed an authentication scheme based IBE algorithm aming at nodes'identity trust .The scheme divided the network into clusters, and realized the key agreement, node identity authentication and data security transmission based on the IBE algorithm .Through theoretical analysis and experimental results and compared to the TinyPK scheme, we can see our program is feasible and efficient. Secondly, from the perspective of the node behavior trust, this paper proposed a Hierarchical trust evaluation model based on trust degree.The model considers the trust of nodes'communication behavior, energy and data comprehensively , and calculated indirect trust value by using the calculation of multiple nodes in parallel recommended to improve exact values of confidence.Finally, based on the work of the first two chapters, in view of the network attacks, we designed a WSN trust model based on the identity. This paper also introduced the practical framework and implementation mechanisms of the model, described its extension under NS2 and the specific application of the proposed model. The experimental results showed that the proposed model can defend attacks from internal and external network effectively.