Study On Trust Model For Wireless Sensor Networks Based On Trust Chain

Wireless Sensor Networks(WSNs), as a distributed network, is integrated with sensor, distributed computing, wireless communications, data integration and data storage technologies etc. With the rapid development and cause of the low price, small size, easy to deploy, wireless sensor technology has been covered in human lives and work. However, every coin has two sides. On one hand, WSNs bring the convenience to people’s lives and work. While, on the other hand, the security issue is one of the urgent problems which needs to be solved immediately.Trust is the premise and guarantee to establish and maintain a safe environment. In order to guarantee the safety in every transaction process, a high-efficient method of trust calculation, secure way to transfer trust should be measured out and should comprehensively consider all the factors which may cause damage to. Building the WSNs trust mode and evaluate the transaction entity. In this paper, it is focused on the study of WSNs trust model and cloud trust model which based on Cluster Structure for WSNs to solve the problems like selection of influence factors, trust calculating, trust transitivity etc.Specifically, the main contents of this paper is as following:(1) Study and analyze the WSNs trust requirements, distinguish out the safety and trust, and then put forward the reasons of studying trust and trust model in WSNs.(2) Taking the abnormal changes of node trust value into consideration, this paper present a trust evaluation method which based on Analysis of Variance, that is: the variance based on the mathematical theory to detect the amplitude of the node trust value in the chain, and set this as one factor, to computing the credibility of trust chain.(3) Nodes transmit data in a trust chain which is connected with multiple nodes.However, the current trust calculation is not accurate for it is just got by simple trust value multiplying. So for this reason, this paper proposes a trust evaluation method based on cloud model theory, that is: separately calculating cloud digital features of each evaluation attribute, passed separately, and finally got synthesis cloud digital features,then use cloud model to describe the situation of trust values.(4) The role of network nodes changes according to the frequent changes of topology in WSNs. This paper presents a cloud trust model which based on Cluster Structure. The details are as follow: converge communications factors, energy factors and data factors, and capture the nodes’ trust influencing factors according to the role of nodes; establishing cloud trust model of ordinary nodes and head nodes by cloud model theory; In WSNs based on cluster structure, respectively measured out the cluster of ordinary node trust value by the head node, and then do the internal decision-making and data collection; Measure out trust value of the adjacent head node, and then decide whether transferring data or not. Research and analysis shows that: the model effectively identify malicious, selfish ordinary nodes and head nodes, and guarantee the normal operation of WSNs and enhance its stability.(5) Research and Simulation Analysis: simulating the actual environment of WSNs, do the simulating study of trust evaluation methods and trust model. And verifying its’ feasibility and rationality.