Research on Secure Multicast Communications in Mobile Ad Hoc Network

Mobile ad hoc networks faces great challenge in group key establishment dues to its characteristics such as mobility, unreliable links, and multi-hop communications delay. In this paper, SODMRP (secure on-demand multicast route protocol) is proposed based on ODMRP (on-demand multicast route protocol) and Identity-Based cryptography, which secures the multicast routing ,and establishes group key during the course of multicast routing discovery without pre-shared secret key distribution among ad hoc nodes, it deceases overhead and delay greatly in the network. The main advantage of the proposed protocol is that establishing a route and a session key between a source and a destination node, when it is needed, can be performed simultaneously in authenticated manner through the routing discovery protocol with no beforehand shared secret key. Simulation results demonstrate that SODMRP is better than current group key establishment algorithm in establishment success ratio and delay.