Mitigating Impact of Blackhole Attack in MANET Shashi Gurung 1 and Dr. Krishan Kumar Saluja 2

Abstract — Mobile Ad Hoc Network (MANET) is one kind of new wireless network structures which is also known as infrastructure less network. Unlike devices in traditional wireless LAN solution, all nodes are movable and the topology of the network is changing dynamically in an Ad Hoc Network, which brings great challenges to the security of Mobile Ad Hoc Networks. MANET is particularly vulnerable to various types of security attacks due to its fundamental characteristics e.g. the lack of centralized monitoring, dynamic network topology, open medium, autonomous terminal and management. As a result, attackers can take advantage of flaws in routing protocols to carry out various attacks. The black hole attack is one of such security issue in MANET. It could disturb the routing protocol and bring about huge damage to the network’s topology. In this attack, a malicious node gives false information of having shortest route to the destination node so as to get all data packets and drops it. In this paper, we propose an algorithm which mitigates the impact of black hole attack in AODV routing