动态存取控制新方案在广播加密中的应用

New dynamic access control scheme and applications in broadcast encryption

为了解决通信系统中的访问控制问题,设计了一种新的分级结构中的基于单向函数思想的方案,同时将此方案应用于广播加密技术中。当使用子集覆盖方法实现广播加密技术时,利用动态存取的特性,使用户能够产生出所属子集密钥。该机制还能有效地完成密钥的分发、用户添加以及用户密钥更换等功能。

To solve the access control problems in communication systems, a new scheme in a hierarchy was designed, which was based on one-way function. Subsequently, it was applied to construct a broadcast encryption scheme. When broadcast encryption is achieved using the technique of subset cover, users can easily derive subset key due to the feature of dynamic access. The scheme is very efficient, especiaUy in key distributing phase, userjoining phase and key updating phase.