A Hybrid of the prefix algorithm and the q-hidden algorithm for generating single negative databases

Ran Liu, Wenjian Luo, Xufa Wang
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引用次数: 12

Abstract

The negative database (NDB) is a complement of the corresponding database. The NDB could protect the privacy of the data, but it should be complete and hard-to-reverse. However, existent techniques cannot generate the complete and hard-to-reverse negative database. In this paper, a hybrid method is proposed to generate single negative databases. The proposed hybrid method includes two phases. Firstly, a complete negative database with a small size is generated by the transformation of the prefix algorithm. Secondly, a hard-to-reverse negative database, which is generated with the q-hidden method, is added into the small complete negative database. Therefore, the hybrid negative database is both complete and hard-to-reverse. Experiment results show that the NDB generated by the hybrid method is better than the NDB generated by the typical q-hidden method. Especially, the NDB generated by the q-hidden method can be reversed on average when the string length is 300. However, the NDB generated by the hybrid method cannot be reversed on average when the string length is 150.
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基于前缀算法和q-hidden算法的单负数据库生成混合算法
负数据库(NDB)是相应数据库的补充。新开发银行可以保护数据的隐私,但它应该是完整的、难以逆转的。然而,现有技术无法生成完整且难以逆转的负数据库。本文提出了一种生成单负数据库的混合方法。所提出的混合方法包括两个阶段。首先,通过对前缀算法的变换,生成一个小尺寸的完整负数据库;其次,在小型完整负数据库中加入用q-hidden方法生成的难以逆转的负数据库;因此,混合负数据库既完整又难以逆转。实验结果表明,混合方法生成的NDB优于典型的q-hidden方法生成的NDB。特别是,当字符串长度为300时,q-hidden方法生成的NDB平均可以反转。但是,当字符串长度为150时,混合方法生成的NDB平均不能反转。
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