Intrusion Detection System Based MANET Security Against Selective Black Hole Attacks

Mobile Ad hoc Network (MANET) is a group of wireless nodes that are distributed without relying on any standing network infrastructure. MANET routing protocols were designed to accommodate the properties of a self organized environment without protection against any inside or outside network attack. Node misbehavior due to selfish or malicious intention could significantly degrade the performance of MANET because most existing routing protocols in MANET are aiming at finding most efficiency path. To deal with misbehavior in MANET, an incentive mechanism should be integrated into routing decision making. In this paper firstly we review existing techniques for secure routing, and then propose to use several IDS (intrusion detection system) nodes are deployed in MANETs in order to detect and prevent selective black hole attacks. The IDS nodes must be set in sniff mode in order to perform the so-called ABM (AntiBlackhole Mechanism) function, which is mainly used to estimate a suspicious value of a node according to the abnormal difference between the routing messages transmitted from the node. When a suspicious value exceeds a threshold, an IDS nearby will broadcast a block message, informing all nodes on the network, asking them to cooperatively isolate the malicious node. This study employs ns2 to validate the effect of the proposed IDS deployment, as IDS nodes can rapidly block a malicious node, without false positives, if a proper threshold is set. Index Terms? AODV, Intrusion Detection, Mobile Ad hoc N