Trust Based hybrid Cooperation Stimulation Mechanism for Mobile Adhoc Networks

Abstract

newline Mobile Ad-hoc NETwork (MANET) is a self-organizing wireless network, formed by the newlinewireless mobile devices without any centralized infrastructure. In MANETs accessibility takes newlinewithout a central point. It consists of mobile hosts like routers in a group and they respond to newlinewith one another. They are characterized by a multi-hop communication, dynamic network newlinetopology, open medium, and so on. Competent routing protocol is required that allows the newlinenodes to cooperate and communicate. newlineA major problem arises due to selfish nodes as they behave in a very selfish manner. newlineEven if the node remains idle, this also can be termed as selfish behavior; existence of newlinenarcissistic nodes in network degrades the network performance and will affect the entire newlinecommunication system. Therefore, detection of selfish nodes becomes a vital issue to preserve newlinethe network and to have effective communication. Also trust is of prime concern in this newlinesituation. newlineThis thesis proposes an optimized algorithm that can secure MANETs against attacks newlineby malicious nodes with a tolerable overhead through the network. The contribution in this newlinethesis is based on Trust and Security, a hybrid cooperation and stimulation mechanism in newlineMANETs is proposed in augmentation phases. newlineIn the first phase a comparative study is done to assess the performance of AODV, newlineDSR and DSDV protocols. This study is done to review the behaviour of nodes in different newlineenvironments and varying traffic. Performance evaluation metrics carried out are reviewed in newlinechoosing the right protocol. newlineIn the second phase a comparative analysis is done with respect to selfish nodes and newlinenormal nodes. Performance evaluation is carried out with various metrics; throughput, dropped newlinepackets, Packet Delivery Ratio (PDR), energy consumption and Normalized Routing Load newline(NRL). This analysis is carried out to devise an algorithm that can overcome selfish node newlinebehaviour and to achieve improvement in efficiency of MANETs newlineIn the third and final phase an algorithm is proposed involving Hash function