PDA-misbehaving node detection & prevention for MANETs

Mobile Ad hoc NETworks (MANET) have the tremendous growth in recent years. Mobile ad hoc networks are gaining popularity because of the availability of low cost mobile devices and its ability to provide instant wireless networking capabilities. MANET is an infrastructure less network and there is no central administration. The open medium, wide distribution of nodes, changing topology and no centralized monitoring makes MANETs vulnerable to malicious attackers. For these types of networks, security is the most essential service to provide protection and prevent malicious attacks occurring in the mobile nodes. Attackers can easily compromise MANETs by inserting malicious or non cooperative nodes into the network. To compensate MANET from these malicious activities in this paper, it is proposed a new intrusion detection & prevention algorithm named as Packet Dropping detection Algorithm (PDA). MANETs depends on the cooperation of nodes in the network for the forwarding of packets to the destination. The Cooperation requires detecting routes on the neighbor nodes. The cooperative node having malicious activity by the attacker may not forward or drops the packets, partially or fully. By PDA algorithm the neighbor nodes inform about the attacker by raising a global alarm and prevent an intruder from the malicious attacks in the network.