Research And Application Of The Security Mechanisms In DTV System

Digital TV is very diffusive in current days,it satisfy our demand for both SHITING and content by its vivid display and excellent tone,In order to protect the copyright well and also manage payment well, encryption and decryption technigue has applied to DTV system. Conditional Access System(CAS) is the typical application,It is a digital payment system,which scramble and encrypt the TV programe content in order to establish an effective system of charge.Meanwhile ,it is also a business support system with empoldering new muti-foundation network business, providing value-added services, protecting system security and opening up new radio and television points of economic growth.Conditional access system is an integrated system, the system involves a variety of techniques, including encryption technology, deinterference technology, coding technology, reuse, smart card technology, network technology, receiver technology, in addition to the users management, program management, information management and management fees technology,etc.The evolutive direction of CATV is integrated communication, namely digitization,wide band, optical fiber, integration, integration network provide a wide range of operation: simulative TV, simulative broadcast, digital TV, NVOD, TVOD, internet,electronic library, electronic press,remote education,SES, videophone, community service, and connect various domestic appliance.Due to the importance of encryption and decryption of digital TV,it's necessary for us to realize how the encryption and decryption build up and how to implement.This subject focus on the topic of the design and implementation of security mechanisms in digital TV system.This paper is mainly talking about these parts below:1.In-depth analysis of simulCrypt or multicrypt in digital TV encryption system.2.In-depth analysis of the DES,3DES and RSA.3.In-depth study in the constructure of the digital TV system.4.In-depth sudy of encryption System and decryption system.5.In-depth analysis of the implementation of the key management in digital TV system.6.In-depth analysis of the implementation of the authentication protocol in digital TV system.With the popularity of digital TV, the encryption system will be developed in depth. For the protection of copyright, providing value-added services, protect system security, and application of the developers , it will provide a favourable help.