A Survey of Techniques to Defend Against Sybil Attacks in Social Networks

Abstract: Most peer-to-peer systems are vulnerable to Sybil attacks. The Sybil attack is an attack where in an adversary creates multiple Duplicate or False identities to compromise the running of the system. By including false information by the Duplicated entities, an adversary can mislead a system into making decisions benefiting . For example, in a distributed review system, an adversary can easily change the overall review of an option by providing plenty of false praise, the option through these fake identities. Defending against Sybil attacks is quite challenging. In this paper, we summarize the existing Sybil defense techniques, we first group the Sybil defense methods, mainly according to their type, and then divide the methods by their approaches.

Keywords: peer-to-peer systems, Security, Sybil attack, Defense