Prevention of Black Hole Attack in MANET

Abstract

An ad hoc network is a collection of mobile nodes that dynamically form a temporary network. It operates without the use of existing infrastructure. One of the principal routing protocols used in ad hoc networks is AODV (ad hoc on demand distance vector) protocol. This is anticipated to offer a range of flexible services to mobile and nomadic users by means of integrated homogeneous architecture. Energy constrained node, low channel bandwidth, node mobility, high channel error rates, channel variability and packet loss are some of the limitations of MANETs. The security of the AODV protocol is compromised by a particular type of attack called 'Black Hole attack'. Black hole attack is one of the security threat in which the traffic is redirected to such a node that actually does not exist in the network. In this attack a malicious node advertises itself as having the shortest path to the node whose packets it wants to intercept. This paper shows simulation results, provides fast message verification, identifies black hole and discovers the safe routing and avoiding the black hole attack.