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Due to broadcast nature of wireless sensor networks and lack of tamper-resistant hardware, security in sensor networks is one of the major issues. Hence research is being done on many security attacks on wireless sensor networks. Sybil attack is a particular harmful attack. When a node illegitimately claims multiple identities or claims fake id, is called Sybil attack. This paper focuses on various security issues, security threats, Sybil attack and various methods to prevent Sybil attack.
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