A Cipher Based Acknowledgement Approach for Securing MANETs by Mitigating Black and Gray Hole Attacks

Abstract

Mobile indicates moving devices and Ad Hoc indicates temporary structure so mobile ad hoc network is a kind of temporary structure less networks. MANET is a collection of independent networks and this network is a non centralized, temporary mesh of continuously moving random nodes where each device in network works as a router and route packets to share data with each other. Due to its continuously evolving topology, limited resource and low safety, this is endangered to different attacks and black hole attack is one of them. To overcome this problem in MANET, a malicious node detection and encryption based approach has been used. In the proposed work reverse tracking mechanism has been used for detection of attacker nodes, that degrades performance of the network and a cipher based mechanism has been proposed to mitigate the multiple black hole and gray hole attacks, which yielded better results than other methods in terms of throughput, PDR, delay and network overhead.