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In this paper, we address a method for an intrusion detection system (IDS) in wireless sensor networks (WSNs). The type of the attack that we address in this paper focuses on dropping packets attacks (DPA) in WSNs and we focus on the design of security enforcement mechanisms for preventing attacks as well. we present a signaling game-theoretic model to analyze intrusion detection in wireless sensor networks. We use a signaling game to model the interactions among nodes of a wireless sensor network. We view the interaction between an attacker and an individual node as a Bayesian game with incomplete information, and construct models for such a game. We prove the authenticity of the proposed model by reaching Nash equilibrium. And achieving Nash equilibrium leads to the defense strategy for the WSN.