Detection of malicious node using improved CONFIDANT technique in Ad-hoc Networks

Ad-hoc Networks are multi hop network in which there is no need of central administration. Each and every nodes in Ad-hoc networks act as router to send and receive data. It means cooperation among the nodes is important for establishing communication between sender and corresponding receiver. It is not necessary that each node act as a cooperative node, some nodes can intentionally act as uncooperative or misbehavior nodes. Because of not having any trusted centralized authority in Ad-hoc network and membership of nodes are constantly changing, detection of such misbehavior nodes is not so easy. One of the effective technique to detect malicious nodes and isolate them from communication is CONFIDANT (Cooperation of Nodes Fairness in Dynamic Ad-hoc Network). Unfortunately this technique is also incorporated with some weaknesses. This paper proposed a malicious node detection technique, called Improved CONFIDANT technique which is inspired from CONFIDANT technique and resolves significant problems of CONFIDANT technique such as detection and prevention of Blackhole Nodes, false reporting problem, network collision as well as providing Quality of Service (QOS).