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Wireless Sensor Networks (WSNs) detect and report interesting events when they occur in the target region. These networks are vulnerable to security breach due to wireless communication and lack of infrastructure. In sinkhole attacks, an attacker attracts network traffic by forging or replaying routing messages through compromised nodes. Thus attracted traffic is used for selective forwarding, Denial of Service (DoS) and false report attacks. This paper shows the vulnerability of the directed diffusion routing protocol to sinkhole attacks. And it also propose the intrusion detection scheme using fuzzy logic for detecting and defending sinkhole attacks in directed diffusion based sensor networks.
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