Research On Secure Routing Of Wireless Sensor Networks Based On Trust Mechanism

Wireless sensor networks are widely used in many fields such as military reconnaissance,security and ecological monitoring due to their low cost and ease of deployment.Sensor nodes are limited in energy,computing,storage and so on,and are usually deployed in an open environment.This makes the node easily captured as an internal attack node.Traditional encryption technology can effectively deal with external attack problems,but it cannot solve internal attack problems.The use of the trust mechanism can effectively deal with the internal attack problem in the wireless sensor network and distinguish between normal and malicious nodes.It is of great significance to safeguarding network security.In order to establish a secure routing mechanism for wireless sensor networks and achieve reliable data transmission,this thesis make deeply research on trust evaluation and secure clustering routing.The main contents are as follows:1.Designing the model of node trust evaluation.In the design of trust model,the emphasis is on the attack of the trust model,which makes up the deficiency of the existing model.Firstly,the direct trust is calculated by the fuzzy comprehensive evaluation model,and the control factor is used to reduce the range of the trust value of the On-off attack node.Then filter and weight the recommendation trust to reduce the impact of malicious nodes on indirect trust.When calculating the integrated trust,self-adaptive weight is designed for historical trust,which inhibits the rapid rise of the malicious node's trust value.The simulation results show that the average trust value of the On-off attack node is reduced by 16.4% compared with the contrast model.The average errors caused by bad mouth attack and collusion attack decreased from 0.118 and 0.101 to 0.051 and 0.039,respectively.This model can effectively deal with the attack of trust model and improve the accuracy of trust evaluation.2.Aiming at the existing trust-aware routing,most of the trust models are simple and the energy consumption is not optimized enough.A secure routing protocol based on trust and balancing energy consumption is proposed.Firstly,aiming at the energy hole problem,the optimal number of regions and the cluster head ratio of each region are deduced.Then introduce the trust model to the clustering routing protocol.This thesis design cluster function and forwarding function,so that ordinary nodes can choose cluster heads with high credibility to cluster,and cluster heads choose highly trusted cluster heads to forward data,thereby reducing the probability of malicious nodes participating in data transmission.In order to reduce the impact of malicious cluster heads on the network,the cluster head penalty coefficients is designed to speed up the recognition of malicious cluster heads.The simulation results show that the packet loss rate decreases by 28.2% on average,and the network lifetime has been extended by 101.4 rounds compared with the comparison protocols.Both the number of data packets and the energy balance have been greatly improved.