Proposal to Provide Security in MANET's DSRRouting Protocol

Abstract

Abstract Mobile Ad-hoc network (MANET) is infrastructure less, self-organizing bandwidth constraint on demand wireless network. MANET is a multi-hop wireless network therefore, needs an efficient routing protocol to transmit data packet from source to destination. MANET routing protocol can be divided as proactive, reactive and hybrid. In an ad-hoc network a node cannot identify the nodes that are beyond its radio range. The nodes in MANET are movable so, a fixed path cannot be defined in between source to a destination. In MANET's reactive routing protocol, like Dynamic Source Routing (DSR), a source node locate the destination before data transmission take place by broadcasting/flooding route request (RREQ) control message and establishes the path after receiving route reply (RREP) control message. During route discovery using DSR routing protocol a malicious node may enter in between source-destination path as an intermediate node or eavesdrop to the source by sending RREP control message before original RREPs (multiple path exists between source to destination) reach to the source with unexpected path information. As a result, without knowing anything source may deliver data packet to a different destination. In this paper, we identified the issues and proposed a solution to prevent to enter the malicious node in between source-destination path. In our proposal, initially we formed a group by considering neighbour nodes of an individual node from the original network and presented the way of communication by the group member using Diffie-Hellman group key (GDH) management scheme in the network through our proposed algorithm. Our proposed algorithm will prevent a malicious node to enter in between source-destination path during route discovery using DSR routing protocol. Further our technique prevents to gainaccess to any node in the network except the group member hence malicious node cannot identify the source to sent RREP control message with wrong path information.