浅析数字电视条件接收系统中的密钥管理  

Brief Analysis of Secret-key to Conditional Access System of Digital TV

作　　者：张德树[1] 

机构地区：[1]滁州职业技术学院,安徽滁州239000

出　　处：《绵阳师范学院学报》2011年第11期107-110,共4页Journal of Mianyang Teachers＇ College

摘　　要：数字电视与模拟电视相比,不仅实现了图像和伴音质量的大大提高,使高清晰度电视变为现实,而且为其开展增值业务提供了条件。为了保证数字电视系统所传输的某些信息的安全,防止非法用户窃收,通常采用加解扰与加解密技术,即实现条件接收。该文主要介绍条件接收系统的发送端的加扰、加密过程和在接收端的解扰、解密过程,以及我国现阶段的智能卡加解扰系统的工作原理。同时也分析了由于数字电视条件接收系统(CAS)内在的脆弱性,也存在的被攻击可能,从而提出一种增强CAS系统安全性的解决方案。The high -definition TV has come into people＇s life, as the image and quality of digital TV, being compared with analog TV, has been greatly improved, and hence, more value -added services gain their conditions to serve people. In order to ensure that digital television transmission of certain information systems security, prevent unauthorized users to steal, usually plus descrambling and encryption technology being used to realize the conditional access. This paper describes the conditional access system of the sender of the scrambling, encryption and descrambling at the receiving end, deeryption process, and the descrambling system of TV smart card now used in China. Also, the inherent vulnerability, the easily being - attacked of the CAS system are analyzed, and in the end, the solution to an enhanced CAS system security is being put forward.

关 键 词：条件接收 机顶盒 密钥 安全性 

分 类 号：TN949.197[电子电信—信号与信息处理]