Research On Security Of WSNs Based On Game Theory

With the rapid development of wireless communication technology,a wireless sensor network(WSN)has a wide application prospect in many fields because of its fast networking,low cost,high flexibility and strong network dynamics.However,due to the limited computation and storage capacity of sensor nodes,the wide range of distribution and the particularity of the environment,sensor nodes are susceptible to various kinds of attacks or natural disasters,which makes the nodes unable to work and has a great potential safety hazard.Therefore,the research on the security of WSNs has gradually become a hot topic in academia.Network survivability,as an important component of network security,is attracting more and more attention.Game theory is to study the game where one player selects its own strategies in response to the other player's strategies.Based on game theory,this dissertation studies the survivability and security issues of WSNs system.The main contents are as follows:Firstly,the related concept of WSNs is briefly introduced,including the WSNs system,the topology structure and the structure of the sensor nodes.Then the characteristics and application of WSNs are expounded,and finally puts forward the security problems and the research significance of WSNs.Secondly,the concepts of game theory,Nash equilibrium and game theory are introduced,and the evolutionary game theory used in this dissertation is described in detail.And a basic overview of the survivability of WSNs and communication theory is given.Then,using the game theory and reliability theory,the availability of susceptible nodes and the survivability of WSNs system are analyzed under the influence of malicious programs.Based on the Markov chain theory,the relevant game model is established,and the probability of state transition is predicted by using Nash equilibrium point of the game model.Through the simulation experiment,the influence of each parameter on the survival of the node and WSNs is analyzed,and the experimental results provide the theoretical basis for prolonging the survival period of WSNs.Finally,the attack and defense game model of malicious nodes and WSNs system is established for WSNs system with malicious nodes,the incentive factor and punitive factor are introduced,and the evolutionary game strategy is used to analyze the strategy selection process.Through the simulation experiments,it reveals the dynamic change process of the two sides' strategy selection,and explores the influence of incentive and punitive factors on the choice of malicious nodes' strategy.The result of the research is expected to provide a theoretical reference for the design of WSNs system security mechanism.