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Wireless Sensor Networks (WSN) security issues are getting more attention by researchers due to deployment circumstances. They are usually deployed in unattended and harsh environments that make them susceptible for many kinds of attacks. Different security mechanisms have been proposed for WSN. Detection-based mechanisms are considered to be the second defense line against attacks when the traditional prevention based mechanisms failed to detect them. Different intrusion detection schemes have been introduced (e.g. rule based, statistical based...etc). Rule-based intrusion detection schemes are considered to be the fast and simple schemes that are suitable for the demand of WSN. However, these schemes are more specific to some kinds of attacks and cannot be generalized. In addition, these schemes cannot detect the unknown attacks that are not included in their rule base. In this paper, we …