Based on SPKI technology, proposing multicast distributed access control system: MDAC, as wall as, proposing a delegation certificate path(DCP) searching algorithm based on binary tree.

• 基于SPKI技术提出了组播分布式访问控制系统MDAC，并提出了基于二叉授权委托树的委托证书路径(DCP)查找算法。