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In recent years, wireless sensor networks applications are increasing very fast such as battle field, disaster recovery, environmental monitoring and healthcare etc. To secure these networks, a secure and efficient system is required to avoid such networks from attacks. In this paper, an intrusion detection policy is proposed for wireless sensor networks. It monitors the communication between neighboring nodes and finds those nodes that are not working normally. Some general rules are defined to detect such nodes called compromised nodes. Simulation results are provided to analyze the performance of the proposed policy which validates the policy performs better in terms of higher intrusion detection rate and receives lower false positive rate.
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