Anomaly based intrusion detection of packet dropping attacks in mobile ad-hoc networks

Mobile ad-hoc networks are more vulnerable to security attacks due to their unique characteristics such as dynamic topology, no fixed infrastructure, resource limitations and multi-hop scenario. In MANETs one the dangerous attack is packet dropping attack. This packet dropping attack is two types: 1. Black hole and 2. Gray hole. In both the attacks, an attacker sends the false reply to source node that it is having the shortest route to the destination. In black hole attack, attackers drops all the packets received from source node and in gray hole attack, attacker drops packets selectively or forwards packets selectively or forwarding packets but not data packets. In this paper, we have proposed mechanism to detect and isolate these attacks in network.