A Novel Scheme for Detection and Elimination of Blackhole/Grayhole Attack in Manets?

Mobile Ad-hoc network (MANET) is a self-configuring and infrastructure-less network of mobile nodes which are connected to each other without wires. Each node in a MANET moves freely and independently in any direction and this leads to a frequent change in their location and dynamic topology of the network. The structure-less architecture of Mobile Ad-Hoc Networks (MANETs) allow various attacks and vulnerabilities in the network. Blackhole / Grayhole are such type of DoS attacks that pose a threat to the working of MANETs. Blackhole / Grayhole attacks both correspond to dropping of packets which are being transmitted in the network which does not allow safe data communication in MANETs. It’s difficult to detect these attacks by using any cryptographic measures because they do not create any separate packets. In this paper we proposed a technique that helps in searching the malicious node in the network and removing it completely. The Ad hoc On-Demand Distance Vector (AODV) routing protocol used in this scheme for Blackhole / Grayhole detection is a type of on-demand routing protocol in which the route discovery process starts only when packet transfer is required between a pair or source and destination. Our proposed work has been designed keeping in mind the packet dropping functionality of both the attacks and thus is able to detect and remove both Blackhole and Grayhole attacker nodes from the network.