Enhanced security scheme against Jamming attack in Mobile Ad hoc Network

Security is the one of the major concerns in Mobile Ad hoc Network (MANET). Due to its unique infrastructure, it creates a number of consequential challenges to the security design. There is a need to make a decent tradeoff between security and performance. In mobile ad hoc networks where the network topology animatedly changes traditional security methods cannot be applied efficiently. Different security schemes against attack improves the performance of network even in the presence of attacker and tries to disable misbehavior activity. In this paper we have proposed an enhanced security scheme against jamming attack with AOMDV routing protocol. The jamming attacker delivers huge amount of unauthorized packets in the network and as a result network gets congested. The proposed scheme identifies the jamming attacker and blocks its activities by identifying the infected or unauthorized packets in network. Multipath routing protocol AOMDV is used to improve the network performance but there is a condition that jamming phase occurs naturally and is not achieved by attacker intentionally. In presence of attacker security scheme always provides the secure path and through multipath routing the possibility of secure routing is enhanced. Simulation results and PDR (Packet Delivery Ratio) values of each node clearly shows better network performance in case of security scheme in presence of Jamming attack.