Research On The Trust Mechanism Of Security And Energy Consumption Equilibrium In Wireless Sensor Networks

In recent years,with the development of sensor technology,large-scale deployment of networks in complex environments has become possible for real-time data acquisition and processing.However,at the same time,because wireless sensor networks are generally deployed in open environments and are vulnerable to various attacks from the outside world,network security issues become very important.The trust mechanism is effective in solving internal network attacks and improving cooperation among nodes.It has become an important component of wireless sensor network security following the key mechanism and intrusion detection mechanism,which has attracted the attention of many scholars.However,the existing research seldom considers the security and energy equilibrium of the trust mechanism.The trust mechanism will cause the node to consume too much energy,and it also leads to risks while ensuring security.In view of the above problems,the thesis conducts related researches on trust assessment and energy consumption,trust decision and network stability.1.In view of the problem of high energy consumption in the trust mechanism,this thesis proposes a security and energy equilibrium trust assessment mechanism.First,we summarize the characteristics of trust evaluation and design a lightweight trust calculation model.Then we analyze the energy consumption problem of trust assessment mechanism,determine the focus of the problem on the acquisition of trust data,and divide the acquisition process into two parts,corresponding to indirect trust updates and recommended trust responses.For indirect trust updates,the signal game model is used to transform it into a trust assessment and node energy optimization problem.For the recommended trust responses,it is transformed into a local network security and energy optimization problem through the prisoner's dilemma model.Finally,according to the Nash equilibrium theory,the optimal strategy of obtaining the dynamic data of trust is obtained.Through simulation experiments,it is verified that the mechanism can effectively reduce the energy efficiency overhead of trust assessment,and achieve the purpose of both safety and energy saving by increasing the trust threshold.2.On the basis of the previous research,aiming at the influence of trust decision on network security and stability in the design of trust mechanism,a evolution model of trust decision based on evolutionary game is proposed.By introducing the evolutionary game replicon dynamic equation,the relationship between trust decision and network evolution is mathematically modeled,and network reliability factors are added to participate in the game.The purpose is to investigate the robustness of the trust mechanism in different network environments.Mathematical proofs are used to derive relevant propositions for trust decision and network evolution and stability,and the effects of network reliability factors and trust thresholds on network security and stability are discussed.Finally,simulation experiments verify the rationality of the model.For the later security and energy equilibrium trust mechanism,the dynamic setting of the trust threshold provides a theoretical basis.