Detection and Prevention of Cooperative Wormhole Attack in a MANET

Mobile Ad hoc Networks (MANETs) are multi-hop, wireless, infrastructure less collection of self organizing mobile hosts that form a temporary cooperative network without the aid of any base station. Every node in the network is capable of functioning as a mobile router. Nodes are free to move arbitrarily, thus the network topology changes rapidly and randomly at unpredictable times. Because of dynamic topology nodes can enter and leave network at any time, during this, malicious nodes can enter and harms the network. So security is an essential service for wired and wireless network communication. There are many solutions to detect and prevent this attack like packet leashes, hop count analysis etc. , but these methods do not provide perfect solution. In this paper a novel method has been focused on detection and prevention of the Cooperative wormhole attack using MD5 algorithm, packet filtering and implemented using AODV routing protocol. MD5 algorithm generates unique ids for all the nodes. Packet filtering and packet forwarding methods are also used for transferring the packets in secure path from source to destination. The experimental results are obtained by varying the concentration of wormhole nodes and are analyzed in terms of throughput, end to end delay and packet delivery ratio. The results demonstrate the efficiency of the proposed method.