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一、概述条件接收CA(Conditional Access)系统是一个综合性系统,系统涉及到多种技术,包括加解密技术、加解扰技术、编码技术、复用技术、智能卡技术、网络技术、接收技术,此外还涉及到用户管理、节目管理、收费管理等信息管理技术。条件接收是数字电视加密控制的核心技术保证,为数字电视的运营提供了必要的技术手段,使拥有授权的用户合法的使用某一项业务,而未经授权的用户不能使用这一业务。条件接收系统是基于MPEG-2和DVB标准开发设计的．并符合广电总局制定的数字电视广播条件接收系统规范。数字视频广播标准DVB(Digitial Video Broadcast)是数字电视的通用国
I. Overview The conditional access CA (Conditional Access) system is a comprehensive system that involves a variety of technologies including encryption and decryption, descramble and scrambling, coding, multiplexing, smart card, networking, receiving, In addition also involves the user management, program management, charging management and other information management technology. Conditional access is the core technology guarantee of digital TV encryption control. It provides the necessary technical means for the operation of digital TV, enabling authorized users to use a certain business legitimately, and unauthorized users can not use this business. Conditional access system is developed based on MPEG-2 and DVB standards. And in line with the SARFT digital television broadcasting conditions to receive the system specification. Digital Video Broadcasting Standard DVB (Digitial Video Broadcast) is a universal digital television