Network Security Situation Assessment Based on Stochastic Game Model

From the perspective of game theory, this paper studies the information security problem, establishes an offense and defense game model of information security, and puts forward a quantitative evaluation algorithm of network security based on stochastic game model. It makes use of the network administrator's evaluation of network equipment's importance to determine the game parameters, analyze Nash equilibrium and work out Nash strategy of the attacker and the defender so as to obtain the probability distribution when network is in different secure states and finally get the evaluation results of network security situation through quantitative analysis. The game model of the attacker and the defender put forward in this paper provides a new idea for solving information security problem in reality.