《计算机应用》唯一官方网站 ›› 2021, Vol. 41 ›› Issue (11): 3288-3294.DOI: 10.11772/j.issn.1001-9081.2021010112

• 网络空间安全 • 上一篇    下一篇

基于可拆分倒排索引的可搜索加密方案

孙晓玲(), 杨光, 沈焱萍, 杨秋格, 陈涛   

  1. 防灾科技学院 信息工程学院,河北 三河 065201
  • 收稿日期:2021-01-22 修回日期:2021-05-13 接受日期:2021-05-14 发布日期:2021-11-29 出版日期:2021-11-10
  • 通讯作者: 孙晓玲
  • 作者简介:孙晓玲(1983—),女,山东莱阳人,讲师,硕士,CCF会员,主要研究方向:密码学、信息安全
    杨光(1984—),女,吉林洮南人,副 教授,博士,主要研究方向:数据分析、图像处理
    沈焱萍(1986—),河北三河人,讲师,博士,CCF 会员,主要研究方向:网络安全
    杨秋格(1981—),女,山东聊城人,讲师,硕士,主要研究方向:数据分析
    陈涛(1998—),男,四川绵阳人,主要研究方向:数据分析。
  • 基金资助:
    廊坊市科技局科学研究与发展计划项目(2020011024);国家自然科学基金资助项目(42007422);中央高校基本科研业务费专项基金资助项目(2020011024)

Searchable encryption scheme based on splittable inverted index

Xiaoling SUN(), Guang YANG, Yanping SHEN, Qiuge YANG, Tao CHEN   

  1. School of Information Engineering,Institute of Disaster Prevention,Sanhe Hebei 065201,China
  • Received:2021-01-22 Revised:2021-05-13 Accepted:2021-05-14 Online:2021-11-29 Published:2021-11-10
  • Contact: Xiaoling SUN
  • About author:SUN Xiaoling, born in 1983, M. S., lecturer. Her research interests include cryptography,information security
    YANG Guang,born in 1984,Ph. D.,associate professor. Her research interests include data analysis,image processing
    SHEN Yanping,born in 1986,Ph. D.,lecturer. Her research interests include network security
    YANG Qiuge, born in 1981, M. S., lecturer. Her research interests include data analysis
    CHEN Tao,born in 1998. His research interests include data analysis.
  • Supported by:
    the Scientific Research and Development Program of Langfang Science and Technology Bureau(2020011024);the National Natural Science Foundation of China(42007422);the Fundamental Research Funds for the Central Universities(2020011024)

摘要:

为快速检索云环境下的加密数据,提出了一种高效的适用于批量数据处理场合的可搜索加密方案。首先,由客户端创建两个倒排索引,分别是存储了文件-关键词映射的文件索引和用于存储关键词-文件映射的空的搜索索引;然后,将这两个索引提交给云服务器。搜索索引是在用户检索过程中由云端根据搜索凭证和文件索引逐渐更新建立的,记录了已被检索关键词的检索结果,该方法将搜索索引的构建时间有效分摊了到了每次检索过程中并节省了存储空间。索引采用基于key-value结构的集合存储方式,支持索引的同时合并和拆分,即在添加和删除文件时,由客户端根据要添加或删除的文件集生成对应的文件索引和搜索索引,然后服务器对索引进行合并和拆分,从而实现文件的快速批量添加和删除。测试结果表明,所提方案极大提高了文件更新的效率,适用于批量数据处理。通过泄露函数证明了该方案能满足自适应动态选择关键词攻击下的不可区分性安全标准。

关键词: 云计算, 可搜索加密, 倒排索引, 索引合并和拆分, 动态更新

Abstract:

For retrieving the encrypted data in cloud environment quickly, an efficient searchable encryption scheme for batch data processing scenarios was proposed. Firstly, two inverted indexes were built by the client, one file index was used to store the file-keyword mapping, another empty search index was used to store keyword-file mapping. Then, these two indexes were submitted to the cloud server. The search indexwas gradually updated and constructed according to the search tokens and file indexesduring the user’s search by the cloud, and the search results of the searched keywords were recorded by this search index. In this way, the search index construction time was shared to each retrieval process effectively and the storage space of search index was reduced. A set storage method based on key-value structure was adopted by the indexes, which supported the at-the-same-time merging and splitting of index, which means when adding and deleting files, the corresponding file index and search index were generated by the client according to the file set to be added or deleted, then the server merged or split the indexes, so that the files were able to be added and deleted in batch quickly. Testing results show that the proposed scheme greatly improves the updating efficiency of files and is suitable for batch data processing. Through leakage function, it is proved that the proposed scheme can meet the indistinguishability security standard against adaptive dynamic keyword selection attack.

Key words: cloud computing, searchable encryption, inverted index, index merging and splitting, dynamic update

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