With the rapid development and widespread applications of Internet of Things (IoT)\nsystems, the corresponding security issues are getting more and more serious. This paper proposes a\nmultistage asymmetric information attack and defense model (MAIAD) for IoT systems. Under the\npremise of asymmetric information, MAIAD extends the single-stage game model with dynamic and\nevolutionary game theory. By quantifying the benefits for both the attack and defense, MAIAD can\ndetermine the optimal defense strategy for IoT systems. Simulation results show that the model can\nselect the optimal security defense strategy for various IoT systems.
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