Trust Based Strategy to Resist Collaborative Blackhole Attack in Manet

This paper analyses the cooperative black hole attack which is one of the new and possible attack in adhoc networks. A black hole is a type of attack that can be easily employed against routing in mobile adhoc networks. In this attack a malicious node advertises itself as having the shortest path to the node whose packets it wants to intercept. To reduce the probability it is proposed to wait and check the replies from all the neighboring nodes to find a safe route. If these malicious nodes work together as a group then the damage will be very serious. This type of attack is called cooperative black hole attack. Our solution discovers the secure route between source and destination by identifying and isolating cooperative black hole nodes. In this paper, via simulation, we evaluate the proposed solution and compare it with other existing solutions in terms of throughput, Packet delivery ratio and latency. We have conducted extensive experiments using the network simulator-2 to validate our research.