Detection Mechanisms for Gray-hole Attacks in MANET and their Limitations to Overcome Smart Gray-hole Attack : A Review
Nayana Elizabeth · International Journal of Wireless Communications and Network Technologies · 2019
Nowadays wireless networks tends to be more popular compared to wired networks due to its mobility and scalability.Among the different types of wireless networks, MANET (Mobile Ad-hoc NETwork) is one of the most popular and unique applications.Due to its dynamic network topology each node is free to move around the network.In MANET every node can act as both a transmitter and a receiver.Nodes in this network can directly transmit messages with each other if they are within the same communication range otherwise they rely upon their neighbors for communication.Due to the selfconfiguring nature of MANET it can be applied in areas like military use, emergency recovery and so on.In MANET it's assumed that all nodes are intimate nodes but in actual scenario some of the nodes become malicious and perform selective packet dropping rather forwarding the data packets.Such type of attack can be generally termed as Gray-hole attack.Among the contemporary grayhole attacks, Smart gray-hole attack is considered to be the most difficult to detect in the network.A smart gray-hole node is a malicious node which acts normally during the route discovery process and after a certain period of time they start dropping data packets routed through them.This type of attacks can severely affect the performance of the network.Hence we require some detection and prevention mechanism against these type of attacks which is considered to be a major issue in MANET.In this paper we discuss about some of the existing mechanisms used to detect gray-hole attacks in MANET and their limitations to overcome smart gray-hole attack.