Security Enhancement in Mobile Adhoc Networks

Abstract

xviii newlineAbstract newlineA Mobile Adhoc Network consists of different mobile nodes in which each node acts newlineas host and router to transfer and receive messages from others nodes. MANET network newlinecan be setup at any time without the need of any fixed infrastructure. The various newlineimportant characteristics of MANET are dynamic topology, infrastructure-less newlinenetwork, node mobility, no centralized control and limited bandwidth etc. If nodes are newlinewithin the range of each other, the information is sent through single hop newlinecommunication. In multi-hop communication, the information is sent through newlineintermediate nodes. The routing protocols in MANETs can be grouped into three main newlinetypes: proactive, reactive, and hybrid routing protocols. Proactive routing protocols, newlinealternatively known as table-driven routing protocols, involve each node maintaining a newlinerouting table that contains information about routes to all possible destinations. Due to newlinemobility of nodes in network, proactive routing protocol regularly updates the routing newlinetable. Reactive routing protocols, also called on-demand routing protocols, establish newlineroutes only when the source node needs to communicate with a specific destination. newlineDynamic Source Routing (DSR) and Ad-hoc On-Demand Distance Vector (AODV) newlineare frequently utilized reactive routing protocols. Each node in MANET is cooperative newlineand genuine which are the assumptions taken in the routing protocol. However, due to newlinethe dynamic topology, openness and without centralized control administration, newlineMANET is vulnerable to various attacks like black hole, gray-hole and flooding attacks newlineetc. Therefore, security is the main prime concern in MANET communication. In this newlinethesis, the impact of black hole, gray-hole and flooding have been studied and newlinetechniques have been proposed to deal with the black hole, gray-hole and flooding newlineattacks. The proposed techniques have been implemented in widely used network newlinesimulator NS2. The results obtained through NS2 simulator have been evaluated based newlineon various performance metrics, including packet d