计算机科学 ›› 2014, Vol. 41 ›› Issue (5): 41-45.doi: 10.11896/j.issn.1002-137X.2014.05.009
徐旸,周薇,杜秋双,王国军
XU Yang,ZHOU Wei,DU Qiu-shuang and WANG Guo-jun
摘要: 在多权限群组通信中,由于用户可根据不同权限获取不同的数据资源,因此其安全问题比传统(单一权限)群组通信更难处理。为此,提出一种新的集中式多权限群组密钥管理方案,即采用多叉树构建密钥图,并为图中节点分配ID,以便用户快速推算出节点间的关系,从而确定需更新的密钥。当群组内的用户关系发生变化时,其他用户可通过单向函数、旧密钥以及密钥更新素材来实现密钥的更新。理论分析与模拟实验显示,相比现有的方案,新方案在保证前/后向安全性的同时,降低了密钥存储和更新的开销,具有更好的性能表现。
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