The Research Of WSN Security Mechanism Based On Trust

Wireless sensor network(Wireless Sensor Network,WSN)is a network system that composed of a lot of micro-cheap nodes which arranged in the monitoring area with the form of wireless self-organization.It has aroused the attention of many scholars because of its extensive application at home and abroad,and it has been rated as one of the ten major emerging technologies that will affect human life.In WSN,the nodes have a number of characteristics,such as limited resources,limited energy,easy to be captured,and so on.So the WSN is extremely vulnerable to malicious attacks,especially when some nodes within WSN are captured,and the important data in the network will be stolen.Even the captured nodes will deliver some malicious data in the network so that result in paralysis of the whole network.There is no way to solve this kind of problem only by the traditional encryption authentication method,so it is urgent to design a mechanism which meets the requirements of WSN security to solve the problem.In this thesis,we utilize the concept of trust model and design a WSN security mechanism based on trust,and calculate the trust value of the nodes,and design the WSN routing based on trust.This mechanism can be used to guarantee the security,reliable and stable of the WSN,and ensure the normal operation of various applications.In this dissertation,we briefly introduces the research background and significance,research status,research objectives and content,and then the security technology of WSN is briefly discussed,mainly from four aspects of WSN security overview,WSN security technology,common WSN security attacks and the current WSN security issues.It is pointed out that the security requirements of WSN mainly include the communication security requirements,the information security requirements and the security requirements of network services,and then we discuss the challenges faced by the WSN security technology.Then,on the basis of the current WSN security technology to do the analysis,including the basic framework agreement SPINS,WSN security technology design of the main program and secure routing.We also give the commonly used encryption technology and security technology in WSN.At last,we analyze the common attack types and corresponding solutions in WSN.We also analyze the safety management mechanism of trust,and trust issues related to the safety management mechanism existed in WSN are summarized,and elaborates the framework of safety management mechanism of traditional trust,proposed and designed the security management mechanism of trust.This thesis describes the working process of WSN security mechanism based on trust,which lays the foundation for the calculation of trust value and the design of trust routing.Aiming at the problems existing in WSN,the management mechanism based on trust designed by this thesis,a method for calculating nodes' trust value in WSN networks based on PageRank algorithm is proposed.Firstly,this algorithm is based on the output chain of nodes,the node's interaction probability matrix is obtained,and then calculate the trust value of the nodes in the network by using the forwarding rate as the reference coefficient.The experimental results show that this algorithm can calculate the trust value of the nodes,and can detect the non-trusted nodes in WSN,which can effectively enhance the security of the network.On the basis of trust security management mechanism,we analyze the deficiency of the existing WSN routing protocol,and proposes a design method of trust routing.In this method,the maximum average trust value and the minimum hop routing strategy are combined.The multi-objective decision method is used to select the path to satisfy the requirements,and the optimal safety path is obtained.And we design the data transmission strategy with credible information.The simulation results show that the trust routing algorithm(TR)is not only the average energy consumption,but also the average end to end delay is smaller than the minimum energy routing(ME)strategy and the minimum hop routing(MH)strategy.