A Mechanism for Gray Hole Attack Detection in Mobile Adhoc Networks

Abstract

The mobile ad-hoc networks are vulnerable to Denial of Service (DoS) attacks. MANET has features like self organizing, working as router as well as host having dynamic topology. In MANET, nodes have limited resources like bandwidth, battery power and storage capacity. Gray hole attack is a kind of denial of service (DoS) attack in mobile ad hoc networks. It is specialized type of black hole attack which changes its state from honest to malicious and vice versa. Gray hole attack is an event that degrades the overall network's performance by intentional malicious activity. In this paper, it is proposed the mechanism against gray hole attack and improves the network performance interms of throughput, packet drop rate, packet delivery ratio and normalized routing overhead.

Survey: Comparison of mechanisms against denial of service attack in Mobile Ad-Hoc Networks

“…Kanthe et al [3] proposed a mechanism for detection of gray hole attack. Gray hole is detected by count of false replies.…”

“…If any malicious node get detected by innocent node, it do not inform to others when detection of gray hole attack [3].In cooperative gray hole attack detection mechanism CBAODV [5] static values are used to assign credit for every node. As MANET network changes its state dynamically, static values are not suitable for this type of networks.…”

“…Kanthe [3] used false replies count to detect gray hole attack. Every node maintains a data structure locally as black list or FALSE REPLY list.…”

“…Kanthe et al [3] introduced a mechanism for Gray hole attack detection. Proposed mechanism is based on false replies receiving from node.…”

Cooperative Gray Hole Attack Discovery and Elimination using Credit based Technique in MANET

“…al. [13] Proposed Algorithm in which checks False_Reply_Count is greater than False_Reply_threshold if it is true then it black list the node. In this method, it stops the detection if the routing table sequence number is less than reply packet sequence number.…”