Authors: P.M. Joe Prathap, V. Vasudevan
Addresses: Department of Information Technology, Arulmigu Kalasalingam College of Engineering, Krishnan Koil, 626 190, Tamil Nadu, India. ' Department of Information Technology, Arulmigu Kalasalingam College of Engineering, Krishnan Koil, 626 190, Tamil Nadu, India
Abstract: Multicast communications seem particularly well adapted for large scale commercial distribution applications, such as pay per view systems. Successful implementation of pay per view systems is underway in many countries, and as a result, many cable companies have to replace their distribution networks. Conditional access system is the essential basis of a pay-TV system to charge the subscriber for the subscribing fee, and key management is the essential part of a CAS. The problem of controlling access to multimedia multicasts requires the distribution and maintenance of keying information. The conventional, approach employs the use of a media-independent channel. We propose an approach that involves the use of a media-dependent channel, and is achieved by using data embedding techniques. In this paper, four levels of key hierarchy for CAS are discussed which reduce the complexity of key distributions. Finally, we introduce multilayer applications where group members may subscribe or cancel membership to some layers while maintaining membership to other layers.
Keywords: conditional access systems; CAS; key management; rekeying; multimedia multicasting; key distribution; pay per view; PPV; pay TV; media-dependent channels; embedded data; multilayer applications.
International Journal of Mobile Network Design and Innovation, 2009 Vol.3 No.2, pp.82 - 92
Published online: 09 Jan 2010 *Full-text access for editors Access for subscribers Purchase this article Comment on this article