Prevention of Co-operative Black Hole Attack in MANET

Abstract

<p class="MsoNormal" style="text-align: left; margin: 0cm 0cm 0pt;" align="left"><span class="text"><span style="font-family: ";Arial";,";sans-serif";; font-size: 8.5pt;">A mobile ad hoc network (MANET) is an autonomous network that consists of mobile nodes that communicate with each other over wireless links. In the absence of a fixed infrastructure, nodes have to cooperate in order to provide the necessary network functionality. One of the principal routing protocols used in Ad hoc networks is AODV (Ad hoc On demand Distance Vector) protocol. The security of the AODV protocol is compromised by a particular type of attack called ‘Black Hole’ attack In this attack a malicious node advertises itself as having the shortest path to the node whose packets it wants to intercept. To reduce the probability it is proposed to wait and check the replies from all the neighboring nodes to find a safe route. Our approach to combat the Black hole attack is to make use of a ‘Fidelity Table’ wherein every participating node will be assigned a fidelity level that acts as a measure of reliability of that node. In case the level of any node drops to 0, it is considered to be a malicious node, termed as a ‘Black hole’ and is eliminated. Computer simulation using GLOMOSIM shows that our protocol provides better security and also better performance in terms of packet delivery than the conventional AODV in the presence of Black holes with minimal additional delay and Overhead.</span></span><span style="font-family: ";Arial";,";sans-serif";; font-size: 8.5pt;"></span></p

Effect of Black Hole Attack on MANET Routing Protocols

“…The attacker or malicious node usually exploits some routing protocols to distribute itself as having the direct and shorter route to source whose packets it wants to grab [1]. Once the attacker adds itself between the communicating nodes, it can do anything malicious with the packets passing between them.…”

AODVB: Ad hoc On-Demand Distance Vector with Black Hole Avoidance

“…The first category is of those which modify specific well known routing protocols such as AODV, DSR and OLSR to avoid/detect blackhole attack during route reply [1] [2]. The second category is of those which adopt an extra monitoring system such as a watchdog, confidant protocol or intrusion detection system [3] [4].…”

“…al. [2] proposed an enhancement of the AODV protocol by introducing fidelity table. The RREPs are collected in the response table and the fidelity level of each RREP is checked and one is selected having the highest level.…”

Risk Mitigation of Black Hole Attack for Aodv Routing Protocol

“…But this approach is not strong enough to cooperative black hole attacks. In [7], authors proposed a solution to avoid multiple black hole attacks in group. In this, every participating node is uses a fidelity table to know the reliability of any node.…”