Trust-Neighbors-Based to Mitigate the Cooperative Black Hole Attack in OLSR Protocol

The main objective of routing protocol is to discover the route from any source to any destination in the network. For this need the MANET working group defined three categories of routing protocols: reactive protocols such as AODV, proactive protocols such as OLSR, and hybrid ones such as ZRP. OLSR is one of the famous routing protocols in wireless network in which routes are immediately available when needed. The key concept of this protocol is the using of nodes called Multipoint Rely (MPR). The MPR reduces the number of duplicated packets broadcasted in the network. This characteristic can be exploited by a misbehavior node and force selection it as MPR by spoofing links with nodes within the network. In this paper, we present the vulnerability of OLSR protocol versus a smart cooperative misbehaviors nodes. After that, we propose a new optimized scheme called Neighbors-Trust-Based. The main idea is the collaboration between neighbors to detect misbehaviors nodes. We demonstrate the feasibility of our scheme through a detailed simulation using NS2.