After researching the multicrypt technique of conditional access deeply, author design a conditional access satellite Set-Top-Box (STB) according to market requirement based on DVB-S, DVB-CI and MPEG-2 standards.

• 本论文在对有条件接收系统的多密技术进行深入研究之后,根据DVB-S,DVB-CI 标准和MPEG-2 标准,结合市场要求设计出基于多密技术的条件接收卫星机顶盒。