计算机科学 ›› 2017, Vol. 44 ›› Issue (1): 167-171.doi: 10.11896/j.issn.1002-137X.2017.01.032
宋文纳,向广利,李安康,张月欣,陶然
SONG Wen-na, XIANG Guang-li, LI An-kang, ZHANG Yue-xin and TAO Ran
摘要： 属性加密适合一对多的广播加密环境,很好地保护了用户的隐私,而且容易实现细粒度的访问控制。然而已有的属性加密方案中安全性假设过强、运算效率较低。通过对Waters方案的安全性假设进行分析,提出了随机参数满足一定特定关系的Eq-BDHE假设。基于该假设实现了一种改进的CP-ABE加密方案。安全分析和对比实验表明,改进方案降低了安全假设强度,在标准模型下能够抵抗选择明文攻击,同时减少了随机参数的数量,提高了运算效率。
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