According to the essential task of the CA system, we design the basic scheme of scrambling and descrambling, and describe the generating, handing out and pick-up of ECM and EMM message.

• 根据CA系统的基本任务,设计了加扰、解扰的基本方案; 描述了授权管理信息(EMM)、授权控制信息(ECM)生成、播发、提取的方法以及该信息生成模块内各部件的接口关系;