Mobile agent based security in MANETS against Sybil attack

In this paper, we deal with mobile ad-hoc networks have emerged as a major next generation wireless technology. An attack in MANET is very vulnerable for all the layers. An attack acts as a malicious node which affects the network performance. Sybil attack is one of the severe attacks in network layer which creates confusion in the routing which can be detected and prevented by an Agent. Agent can able to update the routing information throughout the network and also to reduce the network load. In this research, we propose a mobile agent based scheme to detect the new identities of Sybil attackers without using centralized trusted third party or any extra hardware such as directional antenna or a geographical positioning system and also can be prevented by cryptographic system. The improved in the packet delivery ratio, reduced network overload and the improved bandwidth efficiency are performed using ns2 tool.