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Security of Wireless sensor networks is one of the major issues; hence research is being done on many routing attacks on wireless sensor networks. This paper focuses on Sybil method and its detection. When a node illegitimately claims multiple identities or claims fake id, is called Sybil attack. An algorithm is proposed to detect the Sybil attack. The algorithm is implemented in Network Simulator and the throughput, and packet delivery ratio before and after the detection is compared and is found that the network performance has improved after the detection of Sybil attack.
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