A New Solution to Defend Against Cooperative Black Hole Attack in Optimized Link State Routing Protocol

In Mobile Ad Hoc Networks (MANETs), mobile nodes use wireless devices to create spontaneously a larger network. These nodes communicate with each other by the means of routing protocols. One of this routing protocol is OLSR [1] (Optimized Link State Routing Protocol) which assumes that all nodes are trusted. However, in hostile environnement, the OLSR is known to be vulnerable to various kinds of malicious attacks. This paper proposes a collusion attack against MANETs exploiting vulnerabilities of OLSR. In this attack, two attacking nodes cooperate in order to disrupt the topology discovery and prevent routes to a target node from being established in the network.