基于广播加密的文件保密分发系统

A distributing files system based on broadcast encryption method

对已有的广播加密方案进行了改进,在子集差分广播加密方案(Subset Difference Method)的基础上引入主密钥机制(Master Key)。与SD方案相比较,新的方案在确保安全性的前提下减少了用户存储的密钥量。利用改进方案的层次特性,实现了一个企业文件保密分发系统,可高效灵活地进行解密权限的控制。

In this paper the previously proposed broadcast encryption method has been improved.It applies the master key technique to subset difference method（SD） and proposes one new approach.The improved method is as security as SD and reduces the number of keys users need to store.Because the improved method is layered,It also raises a system that can distribute files in a security way and manage the users conveniently.