Conditional Access System

A conditional access (CA) system comprises a combination of scrambling and encryption to prevent unauthorized reception

1. www.oeclib.in Submitted By : Odisha Electronic Control Library Seminar On Conditional Access System

2. Conditional Access System

3. Index Introduction Functional requirements of a CA system Fundamentals Of CAS How Conditional Access Systems Work Applications Advantages Conclusions and recommendations References

4. Introduction   A conditional access (CA) system comprises a combination of scrambling and encryption to prevent unauthorized reception. Scrambling is the process of rendering the sound, pictures and data unintelligible.

5. Functional requirements of a CA system   Payment schemes : Multiple-decoder households : Sharing of the CA system Receivers/decoders Delivery system CA Systems

6. Fundamentals Of CAS A conditional access system comprises a combination of scrambling and encryption to prevent unauthorized reception. Encryption is the process of protecting the secret keys that are transmitted with a scrambled signal to enable the descrambler to work.

7. How Conditional Access Systems Work

8. Applications While Conditional Access Systems are commonly used for Pay-Per-View applications, they are also often used to restrict Internet and telephone services from subscribers who have not purchased them. For example, while data is constantly being passed through a coaxial cable provided by a cable company, the data is encrypted in order to prevent it from reaching the user’s modem.

9. Advantages Conditional Access Systems are advantageous because they are able to prevent unauthorized users from accessing data they have not purchased without interfering with subscribers who have purchased service. Conditional Access Systems are also advantageous because they are seamless and work without the user’s knowledge.

10. Conclusions and recommendations A basic set of transactional and functional models of CA systems for use with digital video broadcasting systems has been outlined . These models are intended to help EBU Members to understand and evaluate practical CA systems for use with future DVB services and, in particular, to understand the functionality, technical terms, and trade-offs in these systems.

11. References www.google.com www.wikipedia.org www.oeclib.in  

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