【摘要】 基于分组的4层加密用户授权管理策略是目前数字电视条件接收系统为降低用户授权管理数据带宽所采取的主要方法,对分组情况下的用户授权管理信息(EMM)的数据结构进行了详细的分析与计算,重点研究了分组大小与用户授权管理数据的相关关系,指出在中等用户规模的情况下,分组大小取256是适宜的;对于超大用户规模的系统,分组大小为1 024则更为优越。更多还原

【Abstract】 The main strategy for reduce data amount and bandwidth of the entitled management message is group-based four-layer encryption algorithm in digital TV conditional access system.Through a detail studied of the EMM’s data structure of group algorithm,especially discussed the relationship between group size and user authorization management data in this paper.The study result that most suitable group size is 256 in the case of small and medium-sized user-scale vs group size 1 024 for large user-scale.更多还原