Defense against Black Hole Attacks on AODV Routing Protocol Using Fuzzy Logic

Mobile ad hoc networks (MANETs) are suitable option in many cases due to its simplicity and speed of deployment. However, MANETs are vulnerable against various types of security threats because of their dynamic topology and absence of a fixed infrastructure. Especially, the wide employment of this network in military and commercial applications makes its security more important. In recent years, considerable efforts have been made to design secure and robust routing protocol, and many security schemes have been proposed to tackle these security issues. In this paper, we design a defense strategy against black hole attack over the AODV routing protocol. The proposed solution employs the fuzzy logic system to identify malicious nodes in the network. In this design, each node is assigned by a fuzzy value which measures its probability of being an attacker. Extensive simulation, performed in the ns-2 simulator, show that the proposed algorithms outperforms previous methods in terms of number of dropped pockets.