计算机科学 ›› 2018, Vol. 45 ›› Issue (6): 124-129.doi: 10.11896/j.issn.1002-137X.2018.06.021
张蜀男, 蔡英, 范艳芳, 夏红科
ZHANG Shu-nan, CAI Ying, FAN Yan-fang, XIA Hong-ke
摘要： 数据加密是确保云存储数据安全的主要技术,高效的密文检索技术对于提高密文检索效率和减小存储开销起到了决定性作用。大多数已有的基于密文检索的中文数据加密方案需要上传密钥,增加了密钥泄漏的风险。在密文检索过程中,对于关键字的匹配,一些方案需要多次对密文解密,严重降低了密文检索的效率;另一些方案构建了大量的索引文件,浪费了云存储空间。文中提出了一种能兼顾检索效率和存储开销的中文数据加密方案,其在数据加密阶段利用了数据分块随机排序和标号向量加密技术,在密文检索阶段配合构建的索引向量文件对密文进行类明文检索。在整个过程中不需要将密钥上传至云服务器,建立索引向量文件所消耗的存储空间也小于其他基于索引的方案。实验表明,本方案在检索效率和存储开销上优于其他两种方案,并且能在耗费较少时间和存储空间的情况下准确地找到用户存储的数据。
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