Improving Ad Hoc On Demand distance Vector Routing Protocol Against BlackHolc Attacks For Mobice Ad Hoc Net Work

Abstract

A mobile ad hoc network (MANET) is a nonorganized structure, decentralized monitoring and dynamic changing network topology of mobile devices connected by wireless for transmission of data from source to destination. In MANET, security of routing protocol is a basic requirement to provide protected communication between mobile nodes. The vulnerability of MANET creates a number of challenges on securing this routing protocol. In order to overcome these challenges, it is essential to improve the routing technique and achieve secure data communication as well as desirable network performance. MANETs are susceptible to various attacks. Among these black hole attack is one of the common ones, which affects ad hoc on demand distance vector (AODV) routing protocol. In this paper, a new modified AODV protocol is proposed to identify single as well as multiple black hole nodes in networks. Our technique identifies the black hole node based on computing each received route reply(RREPs) from intermediate node which is monitored at the source node. The simulation of the proposed algorithm demonstrates that the solution detects black hole node and allow source node to avoid it and also improves the overall performance of AODV in the presence of black hole attack.