Addressing Packet Forwarding Misbehavior with Two Phase Security Scheme for AODV-based MANETs

One of the important issues related to MANETs is the security. Grayhole attack is one of the most prominent attacks on the network layer of MANET which tends to degrade the network performance by performing selective packet dropping. In this paper, we propose a security mechanism that tends to mitigate the Grayhole attack during the route discovery time as well as during data transmission time. We modify AODV protocol such that it can avoid Grayhole attacker node from participating in the data transmission route, and if the attacker node somehow enters the route, it can be detected through the promiscuous mode monitoring. Index Terms—MANET, AODV, dual security, Grayhole attack, promiscuous mode monitoring.