HANDLING SOURCE MOVEMENT OVER MOBILE-IP AND REDUCING THE CONTROL OVERHEAD FOR A SECURE, SCALABLE MULTICAST FRAMEWORK
Multicasting is a mechanism of efficient delivery of packets from a source(s), intended for a group of hosts. The packets are transmitted using a ‘group address’ in the destination address field, and all subscribed hosts receive the packets. Multicasting reduces the redundancy that would result in case every source decides to transmit packets individually for every other host waiting for the transmission. A multicast tree is constructed which takes care of transmission of the packets for all the recipients. However, problems such as source movement, construction of an efficient multicast tree, a reliable and secure delivery of packets, etc. need to be taken care of. Several recent proposals have focused on handling recipient mobility, but not much attention has been given to the problem of source movement, which may affect the complete multicast delivery tree. In this thesis, we have proposed a scheme to handle the movement of a multicast source. The proposed approach has shown to reduce the network overload as compared to the other existing approaches. We have also addressed the issue of providing a scalable framework for achieving secure multicast transmissions. Secure transmissions are necessary for certain applications where non-authenticated hosts are precluded from sending and receiving packets for the group. The issue of efficient and scalable key management is of prime concern, since multicast generally involves a large number of hosts. A change in group membership often affects many hosts. IOLUS is one existing framework to provide secure multicast, with a central controller and associated trusted entities handling the hosts. However, it encumbers a large overhead whenever members leave the group, when it needs to propagate the new key to the other members in the group. We propose a better, scalable solution, the M-IOLUS framework, which introduces the novel concept of dynamically forming micro-groups. We have performed extensive simulations for both wired and wireless environments, which show a considerable reduction in the overhead incurred, as compared to IOLUS.
School:University of Cincinnati
School Location:USA - Ohio
Source Type:Master's Thesis
Keywords:multicast source movement iolus security key management
Date of Publication:01/01/2003