A dynamic threshold based algorithm for improving security and performance of AODV under black-hole attack in MANET

Mobile Ad hoc network (MANET) is a wireless network which is characterized by dynamic network topology, open medium, multi-hop communication etc. in which each device not only acts as a router but also as a host. Security in the mobile ad-hoc network is one of the most sought-after research topic. The performance of MANET is greatly affected by the presence of malicious nodes in the network. One of the most common attacks in MANET is a denial of service attack in which the source node is not able to communicate with the destination node due to malicious behaviour of the node. The malicious node which drops the packet is known as a black-hole node. In order to mitigate the black-hole attack problem, various techniques have been used by many researchers. In this paper, based on a dynamic sequence number threshold value, MBDP-AODV protocol is used. The main contribution of this paper is the performance evaluation of MBDP-AODV protocol under black-hole attack. Through simulation, it has been found that MBDP-AODV protocol is able to mitigate the impact of black-hole attack under different network density. Although it improves the network performance in terms of packet delivery, throughput and reduces the normalized routing load but it has high routing overhead.