Abstract: Wide application of wireless sensor networks extends people’s ability to obtain information,but its inherent network characteristics make it more vulnerable to cyber-attack.Current intrusion detection systems are against for specific attacks,but powerless for other attacks and consump a little high energy,thus reduce the lifetime of the network.The paper proposed an intrusion detection model based on game theory,in which the attack-defense process between intrusion detection system and attacker is looked as a non-cooperative game model.To deal with the problem of diversity network intruder attacks,game model has been improved and established a non-cooperative information static game model.By analyzing the model’s mixed Nash equilibrium,the optimal defense strategy is obtained.It can balance the detection efficiency and energy consumption of the system.The simulation results show that the intrusion detection system based on game theory not only can resist a variety of network attacks effectively,but also reduce the energy consumption and prolong the lifetime of the network.

Key words: Wireless sensor networks,Intrusion detection,Game theory