Secure AODV against maliciously packet dropping

Due to the open shared medium of wireless communications; wireless Ad hoc networks are more vulnerable toward attacks like black hole, which is a kind of packet dropping attack. It is a dangerous type of DOS attacks which try to harm routing protocols. In black hole, the malicious nodes try to absorb all packets in the networks by advertising themselves as having shortest path to the destination. We present a novel approach to detect this attack based on the neighbor's information. In this scheme, we show that the right place to validate route reply and prevent propagation of forged information in the network is the first node in the reverse path. Analysis and simulation results in ns2 show that using the proposed approach, we can successfully detect the black hole attack with a slightly delay on the network.