Abstract: To better solve the issue of information security defense strategies selection,in view of the characters that attacker and defender’s objectives are oppositional,strategies are interdependent and relationship is non-cooperative,the non-cooperative nonzero-sum attack-defense game model was built.In the model,an improved payoff calculation method was presented.The method takes the defender counterattack payoff into account,therefore the equilibrium is calculated more accurately.With analyzing the mixed strategy game equilibrium,attack action can be credibly forecasted based on rationality hypothesis.On the basis of attack action forecast,an algorithm of defense strategies selection was proposed,which can select the optimal defense strategies against the attack threat.The example analysis proves the effectiveness of the model and algorithm.

Key words: Non-cooperative game,Counterattack payoff,Mixed strategy,Equilibrium analysis,Attack forecast,Defense strategies selection