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Proactive defense is one of the most promising approaches to enhance cyber-security in the power systems, while how to balance its costs and benefits has not been fully studied. ,is paper proposes a novel method to model cyber adversarial behaviors as attackers contending for the defenders’ benefit based on the game theory. We firstly calculate the final benefit of the hackers and defenders in different states on the basis of the constructed models and then predict the possible attack behavior and evaluate the best defense strategy for the power systems. Based on a real power system subnet, we analyze 27 attack models with our method, and the result shows that the optimal strategy of the attacker is to launch a small-scale attack. Correspondingly, the optimal strategy of the defender is to conduct partial-defense.

Exploring the Optimum Proactive Defense Strategy for the Power Systems from an Attack Perspective