DETECTION, PREVENTION AND PERFORMANCE ANALYSIS AGAINST GRAY HOLE ATTACK IN MANET

Abstract

Wireless ad hoc network is an amassment of mobile nodes & all nodes acquits as a router as well as host. By the cause of scarcity of a centralized management, mobility, threats from compromised nodes inside the network, dynamic topology, mobility, scalability MANET network become more unguarded & unprotected than that of a wired network which has a way more efficient & substantial security. Owing to this factor of foible & debilitated environment, As a MANET network is more susceptible to detrimental attacks & network hijacks committed by an immigrant invader. Therefore getting a security fix becomes remarkably oppressive & incommodious assignment in a MANET. Many different nodes exhibiting in the network fall in with diverse class of security hazards that can potentially divulge out the personal or any vital information of attackers concern & benefit. An intruder can exert & utilize a multitudes of means available at his disposal to name few of them are Gray hole attack, black hole attack, worm hole attack denial of service, Sybil attack, encryption & jamming as implements to gain access to crucial & cryptic information as well as can undermine the network intervened. Grayhole attack is one such kind of a dormant security threat which selectively drops the data packets in the network causing loss or theft of information. This thesis work, contemplate a probabilistic approach with IDS (Intrusion Detection System) which identify and tranquillize the grayhole attack effectively& efficiently. The simulation of the objective & propose approach is done in NS2.34 network simulator. The simulation environment is setup to simulate the algorithm in which an area of 900x900 is taken to transmit the data packets over TCP/FTP, UDP/CBR protocols. For the implementation & application Ad-hoc On-demand Distance Vector (AODV) routing protocol and 802.11 wireless channel models are utilized. This work, mainly & majorly focuses & concentrates on providing better security by consuming less energy & comparative testing, a thorough analysis is performed among the performance metrics such as Throughput, Packet Delivery Ratio and Routing load etc.