摘要
CAS(条件接收系统)是DVB(数字视频广播)重要的组成部分。研究一种基于ALI工作平台的CAS系统。给出了CAS的组成结构和系统设计方案,重点论证其加解扰和加解密部分,应用C语言分析CAS的工作原理和实现过程,分析并解决实现过程中出现的问题。
CAS（Conditional Access System） is an important component of DVB（Digital Video Broadcasting）.This article will introduce an ALI-based CAS.and describes the composition structure and system design project,and focuses on the study of its encryption and decryption process,scrambling and descrambling process,and its working principle.At last,the article use C language to analyze the realization process and then solves and analyzes problems arising in the process of realization to achieve the desired function.
