Reserach On Trust Model For Wireless Sensor Networks

With the constant improvement and development of wireless network technology and sensor technology, wireless sensor networks(WSN) has been widely used in medical fields of health, national defense, disaster relief, forest fire, vehicle monitoring, human beings pay more and more attention in security issues. Trust model can be improved WSN security and stability in the context of low power consumption, through building trust model, we can continue to update the node trust and mark the node promptly which is judged unreliable and low energy.This article think about the problem that the existing WSN trust model does not consider the physical distance between nodes and interaction effects on energy on the recommendation from the issue of trust, a wireless sensor network trust model based on distance and physical distance interaction is been proposed. The definition and calculation method of the comprehensive trust about the energy trust based on node physics distance and the recommend trust based on the node interactive distance was presented in this trust model. the trust fusion method about the energy trust based on the node distance, the recommend trust based the interactive distance, the traditional competence trust and behavior trust was given. On the basis of the trust, a wireless sensor network trust model based on node distance is built, and in this model, the Alternative of Cluster Algorithm(AOCA) and The Cluster Nodes Trust Update Algorithm(COTUA) were improved also. The experimental results show that, The wireless sensor network trust model based on node distance and related algorithms improve the success rate of interaction between nodes and increased the interactive delay slightly. This model is applicable to WSN network node on success rate of interaction.Then according to the WSN trust model on node interaction does not take into account the time delay of the direct trust and recommendation trust degree calculation, a WSN trust model based on time is been proposed. This trust model divided into several time periods for The first interaction time and the last interaction time between the nodes in the model according to specific rules, in each period of time, added a time function in node calculation of confidence to give comprehensive trust degree nodes. Adjust the attenuation of function of time by adjustment factor, Reduce the impact of low trust nodes to the accuracy of the result by controlling the length of the time period. The experimental results show that, The Trust model based on the time reduces the interaction time delay between nodes and increase the success rate of interaction slightly. This model is applicable to WSN network node on node interface delay.