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http://dx.doi.org/10.13089/JKIISC.2011.21.1.93

Secure Contents Access Control System in IPTV Flexible-PPC Model  

Kang, Yong-Goo (Hanyang University)
Lim, Ji-Hwan (Hanyang University)
Oh, Hee-Kuck (Hanyang University)
Publication Information
Journal of the Korea Institute of Information Security & Cryptology / v.21, no.1, 2011 , pp. 93-104 More about this Journal
Abstract
A conditional access system is an essential element in IPTV services enabling service providers to allow authorized access to their services only to paid subscribers. Currently, there are two types of IPTV service models, namely PPC (pay-per-channel) and PPV (pay-per-view). However, a more desirable model would be the flexible PPC model, in which subscribers are free to choose any combination of preferred channels and add/remove channels independently. In this paper, we first point out that a previously proposed key management scheme for F-PPC is not secure. We then propose a new conditional access system using 4-level key hierarchy to realize secure F-PPC services. Compared to existing schemes, the proposed system is very efficient, just requiring O(1) communication for key update.
Keywords
IPTV; conditional access system; CAS; group key;
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