Defending Sybil attack using Associate Membership method in Distributed P2P Network

The Peer-to-peer networks popularity is increasing day by day for its resource allocation system like file sharing, Skype etc .The system is extremely fast because of its fully decentralized nature. Although this is efficient system but this system’s security is vulnerable and can be attacked anytime by attackers. This paper describes P2P’s most challenging threat Sybil attack. Generally Sybil attack is defined as an attack by a malicious user who creates multiple identities and act as separate and real nodes. These fake nodes are called Sybil nodes. After creating these fake IDs, malicious user can control the network by controlling the nodes which contains resources. They can also change the resources and can attack node’s routing table, they can damage node’s communication on the network. This paper describes possible solutions against this attack by using existing SyMon protocol with our proposed “Associate membership” method .By implementing the proposed model performance will increase to defense against Sybil attack.