A Modified Approach to Improve Security and Congestion Control in AODV Routing Protocol against Blackhole Attack

A Wireless ad-hoc network is an impermanent network set up by wireless mobile nodes moving random in those spots which have no network framework (infrastructure) or incorporated (centralized) access point. Since the independent nodes have ability to interconnect with each other, they collaborate with one another by sending information packets to different nodes in the system. Thusly the nodes determines a route to the terminus node by means of routing protocols. Wireless ad-hoc networks are vulnerable to assaults of mischievous nodes because of security liabilities of the routing protocols. One of this kind of attack is Blackhole Attack and this kind of assault influences network integrity by stimulating all information packets in the network. In this research paper we intend a solution, which improves the security of Ad-hoc ondemand distance Vector (AODV) routing protocol to prohibit Blackhole attack. So we analyze the influence of a Blackhole assault in a mobile ad hoc network and associate it with our recommended AODV routing protocol. For examining execution and concert of our recommended algorithm, performance metrics are taken into consideration such as system throughput, no. of packets send, received and dropped, packet delivery ratio and average end-to-end delay. Keywords-MANET, AODV, Blackhole attack, RTS, CTS. _________________________________________*****_________________________________________