Research On Optimization And Secure Routing Scheme Of MANET AODV Protocol

A mobile ad hoc network (MANET) is a multi-hop temporary autonomous system of mobile nodes equipped with wireless transceivers and receivers. As it doesn't depend on fixed network infrastructure, and it doesn't have central controlling node as well as be good in resisting destructions, it is applicable to many situations that have difficulties in wiring networks. Based on these special advantages, MANET plays an important part in military applications, and it also has a good prospect in civil applications. AODV protocol is an on-demand routing protocol which is specifically designed for MANET. It's one of the few MANET routing protocols that has been authorized to be RFC texts by IETF. So AODV protocol will probably play an important role in future MANET applications.Based on detailedly understanding the MANET characteristics, deeply analyzing the mechanism of AODV and thoroughly studying and evaluating the existing related researches, the AODV-PC and SAOMDV are proposed in this paper, in which AODV-PC is an optimization to AODV with path-collection and SAOMDV is a multi-path secure routing scheme to AODV.Aiming at improving the performance against limitation of the destination-oriented routing discovery manner of AODV protocol, AODV-PC adopts the path-collection mechanism of DSR protocol and has raised the efficiency of AODV, meanwhile it avoids being affected by the high running overhead and weak scalability of DSR protocol. Results obtained by Network Simulation (NS) shows that the optimized AODV scheme performs effectively in terms of successfully packet delivery ratio, routing overhead and end-to-end delay.Based on the analysis of various types of possible attacks to AODV, SAOMDV, which is a secure routing scheme to AODV, is proposed considering the AODV characteristics. This scheme introduces mechanism of multi-path routing, one-way hash algorithm and data signature technique, to guarantee the security of AODV protocol through adding extension to its routing packets. It not only can ensure the availability of the existing routings, the integrity, authentication and no-repudiation of the routing...