Defending Mechanisms Against Sybil Attack in Next Generation Mobile Ad Hoc Networks

This paper presents techniques adopted to defend against Sybil Attack in Mobile Ad Hoc Networks. Sybil attack and the existing defense mechanisms against this type of attack have been reviewed and their loopholes are indicated. Multifactor Authentication Scheme has been discussed pointing out its superiority over traditional Cryptography-based Authentication Schemes. Afterwards, Passive Ad Hoc Sybil Identity Detection techniques differentiating a Sybil attacker from a group of legitimate nodes moving together is also discussed. Merits and demerits of these methods are mentioned and also the scopes for future research to improve these detection schemes have been indicated.