计算机科学 ›› 2017, Vol. 44 ›› Issue (Z11): 377-380.doi: 10.11896/j.issn.1002-137X.2017.11A.079
翁岸祥,凌捷
WENG An-xiang and LING Jie
摘要： 隐藏访问结构的密文策略属性基加密(CP-ABE)算法能将访问结构隐式地嵌入密文中,用户即使多次尝试不同的属性组合,也无法得出访问结构,而避免了加密方的相关信息的泄露,但是同时也导致了计算复杂、访问效率低等问题。文中提出了一种改进方案,将双线性对的运算量减少了近一半,有效地提高了效率,并且证明了在DBDH(判定双线性问题)假设下,该方案在标准模型下是选择明文安全的。
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