Detection of black hole attack in enhanced AODV protocol

Wireless Adhoc network is decentralized in nature which means it is independent of base station and do not rely on fixed routers to route packets from source to destination and also is dynamic in nature which is made up of mobile nodes. Although there are multiple proficient reactive protocols like AODV, TORA, DSR etc. there are some loop holes in these reactive protocols which are of on-demand type. One of the serious problem identified in such protocols is black hole attack, in which a malicious node (or group of malicious nodes) in the network act as legitimate node but actually does some superfluous actions in the network. It is very important to identify this type of malicious nodes in the initial stage so that further complications can be avoided. At present, normal AODV which is based on hop-count metric to detect the packets suffer from black hole type of attack. In this proposed work, care is taken to enhance the AODV protocol by making it delay aware. Detecting the black hole attack and avoiding them in participating in the network transactions is the primary focus of this paper. All nodes in network are ranked based on their distance from particular node which wishes to send packets through the network.