基于中国剩余定理和动态分组的密钥分配算法

在数字电视条件接收系统当中,由于用户数量庞大,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。论文在中国剩余定理的基础上,结合动态分组管理来实现对数字电视用户进行密钥分配和授权。该方案不仅可以减小单个用户的授权状态发生变化时的影响范围,而且能够在密钥的计算复杂度和带宽消耗之间进行取舍和均衡。

A Key Distribution Scheme Based on Chinese Remainder Theorem and Dynamic Grouping Management

A fact in the Conditional Access System(CAS)of Digital TV(DTV)is that,computation and distribution for access keys is a great load because of great number of terminal users,and this is also the key point which has to be considered seriously.Based on Chinese Remainder Theorem(CRT),this paper presents a new scheme using dynamic grouping management to authorize terminal users.This scheme not only can reduce the affection range when one terminal user's authorization state changes,but also can effectively get the trade-off between complexity and band-width consumption during encrypting and transmitting keys.