CRY OLSR: Crypto Optimized Link State Routing for MANET

Ad hoc mobile network usually called MANET (Mobile Ad hoc Network) is an autonomous system of mobile nodes connected by wireless links and forms a temporary network with a variable topology. MANET work without preexisting fixed infrastructures and without a centralized administration. The performance of a MANET network is strictly related to the capacity of the routing protocol implemented to adapt itself to the unpredictable changes in the network topology and the link state. One of these routing protocols is OLSR (Optimized Link State Routing Protocol) which assumes that all the nodes are in a trusted environment. However OLSR is vulnerable to all kinds of malicious attacks. In this paper, we proposed a security mechanism that is an extension of OLSR, called CRY-OLSR. This new mechanism is based on an asymmetric cryptographic that allows the identification and then the isolation of malicious nodes in the network. The simulation results, using OPNET simulator, show the effectiveness of our mechanism.