Detection of cooperative black hole attack using crosschecking with truelink in MANET

Mobile ad hoc networks (MANETs) are widely used in military and civilian applications. The dynamic topology of MANETs allows nodes to join and leave the network at any point of time. This general characteristic of MANET has rendered it susceptible to security attacks. The black hole attack is a well known severely occurring security threat in wireless mobile ad hoc networks. A black hole is a malicious node that spuriously replies for any route request without having any active route to the specified destination. It then absorbs all the data packets and drops them fully or sometimes partially so that the destination node will not be able to get the data packets results in affecting the PDR (packet delivering ratio) to a great extent. Sometimes the Black Hole Nodes cooperate with each other with the same aim of dropping packets these are known as cooperating Black Hole nodes and the attack is known as Cooperative Black Hole attack. This proposed work used a modified AODV for that we used a technique for detecting a cooperative black hole attack using crosschecking with True-Link concept. True-Link is a timing based countermeasure to the cooperative black hole attack. The proposed algorithm improves the results as compared to existing system.