A Comparitive Study of Malicious Node Detection Scheme in MANET

Abstract: A mobile ad hoc network (MANET) is the continuously self-configuring, infrastructure less network of mobile devices connected without the wires and sometimes untrustworthy. Mobile ad-hoc networks (MANETs) assumes that mobile nodes voluntary cooperate in order to work properly. This type of cooperation is a cost-intensive activity and some of the nodes can refuses to cooperate leading to selfish node behavior. Thus an overall network performance could be seriously affected. The use of Watchdog is a well-known mechanism to detect the threats and attacks from misbehaved and selfish nodes in computer networks. In infrastructure less network attack detection and reaction is a key issue to the whole network. Watchdog system overhear traffic and perform analysis using data collected to decide the grade of misbehavior of neighbor nodes present and therefore an accuracy and detection speed plays a key role in achieving the right level of network security and performance. The problem behind the use of watchdog is that they can cause a relatively high level of false positives, false negatives and causes black hole attack. This paper proposes a collaborative approach for detecting black holes and selfish nodes in manet using a set of watchdog which collaborate to enhance their individual and collective performance and shows that using this approach the detection time of misbehaved nodes is reduced and an overall accuracy is increased.

Keywords: Mobile Ad hoc Networks (MANET), selfish, node, misbehavior, detection.