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中文摘要：
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策略。在条件接收系统当中，由于节目数量不断增加、用户数量日趋庞大，密钥的计算和分发所带来的系统开销成为关键的考虑因素。针对基于密钥的CA系统，分析其分层密钥循环技术以及密钥分配与授权带宽计算等关键技术，提出了一种基于动态用户分组的四层密钥分配机制，极大地减小了授权信息的数据量，从而节省了大量带宽。实际项目测试证明了该方法的有效性和可行性。
英文摘要：
Conditional access system （CAS） is the key point of authorization in digital TV（DTV）, and as well, key distribution scheme plays the central role of CAS. In the CAS of DTV, computation and distribution for access keys is a great load because of the increasing number of programs and terminal users, and this is also the key point which has to be considered seriously. This paper, for the CA system based on key, analyses its hierarchical encryption technology, key distribution and the calculation of authorization bandwidth, then proposes a four - level key distribution scheme using dynamic user grouping, which enormously reduces the amount and bandwidth eonstanption of authorization message. Actual testing shows that this new scheme can be effective and feasible.
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