基于双重分组的密钥分配算法  

A Key Distribution Scheme Base on Dual-grouping Access

作　　者：秦军波[1] 王兴军[1] 

机构地区：[1]清华大学信息技术研究院数字电视中心,北京100084

出　　处：《微计算机信息》2007年第36期1-2,8,共3页Control & Automation

摘　　要：实现数字电视授权管理的关键是条件接收,而条件接收的核心环节则是密钥的分配算法。本文在单一分组算法的基础上,提出了基于节目分组和用户分组的双重分组算法。与无分组或单一分组算法相比,该方案能够减少密钥传输的带宽消耗;而且,当单个用户加入或者退出授权时,只需要处理该用户的小组密钥而不影响其他小组,从而降低了系统开销,提高了系统灵活性。Conditienal Aceess System （CAS） is the key point of authorization in Digital TV （DTV）, and as well, key distribution scheme plays the central role of CAS. Based on single grouping algorithm, this paper presents a new scheme using dual-grouping access. The core idea of this scheme is the adoptions of both channel grouping and user grouping, which we called dual-grouping scheme, Compared with sing/e-grol：lpiug or non-grouping scheme, this new scheme can reduce the bandwidth consumption for transferring keys. Moreover, it will be much easier to deal with single user-terminal＇s joining and quitting without any influence to other groups; this will also reduce the system load and increase the system flexibility.

关 键 词：数字电视 条件接收 密钥分配 双重分组 

分 类 号：TN918.74[电子电信—通信与信息系统]