Improving Packet Delivery Ratio with Enhanced Confidentiality in Manet

In Mobile Ad Hoc Network (MANET), the collection of mobile nodes gets communicated without the need of any customary infrastructure. In MANET, repeated topology changes and intermittent link breakage causes the failure of existing path. This leads to rediscovery of new route by broadcasting RREQ packet. The number of RREQ packet in the network gets added due to the increased amount of link failures. This result in increased routing overhead which degrades the packet delivery ratio in MANET. While designing routing protocols for MANET, it is indispensable to reduce the overhead in route discovery. In our previous work[17], routing protocol based on neighbour details and probabilistic knowledge is utilized, additionally the symmetric cipher AES is used for securing the data packet. Through this protocol, packet delivery ratio gets increased and confidentiality is ensured. But there is a problem in secure key exchange among the source and destination while using AES. To resolve that problem, hybrid cryptographic system i.e., combination of AES and RSA is proposed in this paper. By using this hybrid cryptographic scheme and the routing protocol based on probability and neighbour knowledge, enhanced secure packet delivery is ensured in MANET.