Abstract: From many years, people were concerned about the security of social area network. In this social area network people create multiple bogus identities. To overcome this drawback, Sybil Defender mechanism is used along with the two way security technique is use. The proposed system involve sybil identification technique along with the concept of the two way security mechanism .This two way security mechanism divide the password in two server and according to fake clustering , ip differentiation ,ip log technique is use to identify where the user is sybil or genuine user. Due to this we can easily identify the sybil user. Thus we conclude that the proposed system provide better security than the traditional one.

Keywords: sybil attack, Sybil Defender, ip log.