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In this work, we propose the architecture of hybrid intrusion detection system (eHIDS) for wireless sensor networks. In order to get hybrid scheme, we use combined version of anomaly and misuse detection techniques. In addition, we use cluster-based wireless sensor networks to reduce communication and computation costs. We evaluate the performance of our scheme by simulating the network and comparing with other related schemes. The simulation results show that our scheme performs better than other schemes in terms of energy efficiency and high detection rate.