Research Of Network Virus Defense Model Based On Game Theory

At present, the network technology has got unprecedented development,computer network plays an increasingly important role in the field of economic,military,political and life.However,network security events caused by the invasion and spread of network virus occur frequently and network security is becoming increasingly serious.Network virus defense model provides policy guidance for the defense of network,which plays an important role in the confidentiality, integrity, and availability of the network and the normal operation of the whole network from virus.The article discussed and studied the network virus defense model based on game theory,the main contents include proposed the spreading model of network virus,established the game model between Internet Service Providers(ISPs) and attacker,and the optimal investment model of ISPs’,the dynamic analysis was provided based on the above models,specific details are as follows:(1)Proposed the spreading model of network virus.Based on the SIR(susceptible-infected-recovered) bin model of network virus,ISPs could be divided into three categories:Susceptible S(t);Infected I(t);Recovered R(t).The relative risk of adopting security measures was considered,the spreading of network virus under different strategies was analyzed.(2)Established the game model between ISPs and attacker.The unequivalence on egress detection and ingress detection of ISPs was considered.Put forward the necessity of egress detection..The infection of virus and ISPs’ utility were analyzed based on the change of ISPs’ strategy,the reference for ISPs’ selection of strategies was provided.(3)Put forward the optimal investment point model of ISPs.The random process of virus spread was considered.From the spreading model of network virus and the rule of virus to network, the existence conditions of the optimal investment point of ISPs’ were analyzed based on the differential equation and poisson process.