Technique for detection of cooperative black hole attack using true-link in Mobile Ad-hoc Networks

Mobile Ad-hoc Network (MANET) is a collection of communication devices or nodes that wish to communicate without any fixed infrastructure and predetermined organization of available links. Security is a major challenge for these networks owing to their features of open medium, dynamically changing topologies. A black hole is a malicious node that falsely replies for any route requests without having active route to specified destination and drops all the receiving packets. Sometimes the black hole nodes cooperate with each other with the aim of dropping packets. These are known as cooperative black hole attack. This proposed work suggests the modification of Ad-hoc on Demand Distance Vector (AODV) routing protocol. We used a technique for detecting as well as defending against a cooperative black hole attack using True-link concept. True-link is a timing based countermeasure to the cooperative black hole attack. This paper shows the performance of MANET decreases for end-to-end delay, normalized routing overhead and increases throughput and packet delivery ratio.