Secure Directional Routing to Prevent Relay Attack

In a wireless ad hoc network, routing process is done by means of some intermediate nodes. Hence, the behavior of these nodes is important for secure path establishment between the source and the destination nodes. Several secure routing protocols have been proposed for wireless ad hoc networks. In this paper, a novel routing attack is proposed, where a malicious node can attack to the routing process without collusion with any other partner. We name this attack as relay attack. Also, an efficient secure routing protocol, based on directional antennas, is presented which is survivable against relay attack.