A Simulation Scheme for Improving the Data Security in Mobile Ad-hoc Network

With the modernization of the wireless communication system, mobile ad-hoc network (MANET) has gain a pace in the area of communication system. Conceptualized with infrastructureless networking system, every mobile nodes in MANET participate in the process of network behave both as host as well as router and therefore, it is guided by the communication principles to forward the packet to other nodes and hence formulate networking phenomenon. The area of MANET has already found its scope in Military Battlefield, Sensor Networks, Commercial Sector, Medical Service, and Personal Area Network. MANET possesses some inherent characteristics e. g. self-organizing capabilities, maximum degree of freedom, dynamic topology etc. Although, the research attempts in MANET is more than a decade old, but still commercialization of the technology are yet to be seen and therefore, due to novelty nature of the technology, MANET is also shrouded by various issues. Although, there are wide ranges of issues in MANET (Routing, power, bandwidth, Quality of Services), but the proposed study focuses on more critical issue e. g. security issues. Mobile ad-hoc network (MANET) is a self-configuring network that is formed automatically via wireless links by a collection of mobile nodes without the help of a fixed infrastructure or centralized management. The mobile nodes allow communication among the nodes outside the wireless transmission range by hop to hop and the forward packets to each other. Due to dynamic infrastructure-less nature and lack of centralized monitoring points, the ad-hoc networks are vulnerable to attacks. The network performance and reliability is break by attacks on ad- hoc network routing protocols. AODV is a important on-demand reactive routing protocol for mobile ad- hoc networks. There is no any security provision against a Black Hole and Wormhole attacks in existing AODV protocol. Black hole nodes are those malicious nodes that conform to forward packet to destination. But they do not forward packet intentionally to the destination node. The black hole nodes degrade the performance of network by participating in the network actively. The propose watchdog mechanism detect the black hole nodes in a MANET. This method first detects a black hole attack in the network and then provides a new route to this node.