基于椭圆曲线密码的分级访问密钥分配方法

摘要

针对数字电视有条件接收系统中的密钥分配,提出了一种基于椭圆曲线密码的分层访问控制密钥分配方案.该方案可使一个接收组有效地衍生其下属组的接收密钥,方便地实现了增/减接收组、增/减组关系和改变授权密钥等动态访问管理,且只需重新计算一些相关参数而无需改变其他密钥.%A key distribution scheme based on elliptic curve cryptography for Conditional Access System (CAS) in Digital TV broadcast is proposed. The proposed scheme ensures that a receive group can efficiently derive secret keys of its successors. Dynamic access control problems, such as adding/deleting group, adding/deleting relationships and changing secret keys, are easily solved only need to recompute some relevant parameters without altering others keys1.