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Conference Paper
A Hierarchical Package Group-based Key Distribution Scheme for Conditional Access of Subscription Channels in Pay-TV Systems
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- Authors
- Jin Young Moon, Jong Youl Park, Eui Hyun Paik
- Issue Date
- 2006-11
- Citation
- International Workshop on Advanced Multimedia Technology and Applications (AMTA) 2006, pp.1-9
- Language
- English
- Type
- Conference Paper
- Abstract
- A Conditional Access System (CAS) is essential to protection of the premium contents from unauthorized access in Pay-TV systems. To allow only authorized subscribers to view the contents, a CAS scrambles the contents with a scrambling key according to a scrambling algorithm. Generally, the scrambling key is also used to descramble the transmitted contents at a subscriber’s set-top box. In order to securely send the scrambling key, the CAS transmits the scrambling key after encrypting it with another key. For security and efficiency, the CAS usually provides a multilevel key distribution scheme including the highest scrambling key and lower encryption keys. In this paper, we proposed a flexible and efficient key distribution scheme by defining hierarchical package groups for subscription channels. Our key distribution scheme enables CAS to support various subscription packages of Pay-TV system and to reduce the number of encryption and transmission of the constituent keys.
- KSP Keywords
- Conditional access system, Key distribution scheme, Pay-TV, Security and efficiency, Set-top-box(STB), Unauthorized Access