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Nodes in a mobile ad hoc network need to come up with counter measures against malicious activity. This is more true for the ad hoc environment where there is a total lack of centralized or third party authentication and security architectures. This paper presents a game-theoretic method to analyze intrusion detection in mobile ad hoc networks. We use game theory to model the interactions between the nodes of an ad hoc network. We view the interaction between an attacker and an individual node as a two player noncooperative game, and construct models for such a game.