Intrusion Detection System Against Colluding Misbehavior in MANETs

Routing protocol of MANET works with the presumption that nodes will transmit the data in collaboration. This presumption is a limitation of routing protocol which gives an occasion to attackers to hinder the security of the device and data in the network. Therefore, it becomes vital to develop methods and systems which will ensure the safety, integrity and confidentiality of data in such devices and systems. Although, existing IDS are able to detect various types of attack but some misbehavior goes undetected which potentially damage the network. Collusion attack is one such misbehavior where nodes perform maliciously in collaboration with neighboring nodes without being detected. In this work, Intrusion detection algorithm has been proposed that can effectively detect and isolate colluding nodes from the network so that these malicious nodes do not affect the performance of the network . Proposed detection algorithm uses in–out traffic information and overhearing statistics of nodes to identify colluding attackers. Detection algorithm works successfully for DSR routing protocol. Experimental results on NS-2 show that the proposed algorithm is capable of reducing the packet drops consequently improving the throughput of the network in presence of collusion attack.