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Recently, there is an increasing interest in Security and Privacy issues in Vehicular Ad hoc NETworks (or VANETs). However, the existing security solutions mainly focus on the preventive solutions while lack a comprehensive security analysis. The existing risk analysis solutions may not work well to evaluate the security threats in vehicular networks since they fail to consider the attack and defense costs and gains, and thus cannot appropriately model the mutual interaction between the attacker and defender. In this paper, the authors consider both of the rational attacker and defender who decide whether to launch an attack or adopt a countermeasure based on its adversary's strategy to maximize its own attack and defense benefits.
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