Ant based Defense Mechanism for Selective Forwarding Attack in MANET

A selective forwarding attack is one of the most crucial security problems in MANET. Usually such attacker degrades the network performance in terms of packet loss rate, collision, and overhead. Designing MANET that can work reliably even in the presence of inside packet drop attackers is really challenging. In order to overcome these issues, we have proposed an enhanced Ant based Defense Mechanism for Selective Forwarding Attack in MANET. First, we have implemented S-ACK scheme to transmit the secure acknowledgement. To detect attackers, a trust model is designed. The Forward ant agents transmit back the digitally signed S-ACK through the Backward Ant agent to detect any selective forwarding attack against any source node. Also a Challenge and Monitoring packet is transmitted by source node to monitor the neighbor node and the verification table updated by an ant agent.