| 加密文档排序中保序加密算法的最优化选取 |
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| 引用本文： | 张久岭,黄道超,沈时军.加密文档排序中保序加密算法的最优化选取[J].北京航空航天大学学报,2022,48(2):266-272. |
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| 作者姓名： | 张久岭 黄道超 沈时军 |
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| 作者单位： | 国家计算机网络应急技术处理协调中心, 北京 100029 |
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| 基金项目： | 国家重点研发计划(2016YFB1000105)~~； |
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| 摘 要： | 对需要存储在服务器端的用户文档进行加密是对用户隐私保护的根本方法。采用不同的保序加密算法对加密文档排序结果有着不同的影响，寻找排序结果最优的保序加密算法是亟待解决的问题。提出了基于鉴别信息的保序加密算法选择的标准，比较了2种保序加密算法下对加密文档排序的性能。在通过保序加密算法得到的密文分布接近明文分布的情况下，排序得到的结果更接近明文检索的情况。所提出的选择标准具有理论上的意义，同时也可以指导在相同安全条件下保序加密算法的选择，以达到最优的检索结果。
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| 关 键 词： | 保序加密 Okapi BM25模型 鉴别信息 加密信息检索 用户隐私保护 |
| 收稿时间： | 2020-08-10 |
Opti mal choice of order preserving encryption scheme in encrypted document ranking |
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| ZHANG Jiuling,HUANG Daochao,SHEN Shijun.Opti mal choice of order preserving encryption scheme in encrypted document ranking[J].Journal of Beijing University of Aeronautics and Astronautics,2022,48(2):266-272. |
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| Authors: | ZHANG Jiuling HUANG Daochao SHEN Shijun |
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| Affiliation: | National Computer Network Emergency Response Technical Team/Coordination Center of China, Beijing 100029, China |
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| Abstract: | Encrypting the documents before uploading them to the untrusted removable server is one of the ultimate solutions to protect the user privacy. As different encryption schemes give different ranking results, finding the order preserving encryption scheme that gives the best ranking result is the key issue to be solved. A discrimination information based on criterion for selecting the order preserving encryption scheme is proposed and then employed to compare the ranking results of two different order preserving encryption schemes. In the case the distribution of the cipher text is closer to that of the plaintext, the ranking result is closer to that in the plaintext scenario. The proposed criterion is not only instructive in theory, but also helpful practically in choosing the order preserving encryption scheme under the same safety conditions, which further lead to the optimal retrieval result. |
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