论文标题

改进了弱私人信息检索代码

Improved Weakly Private Information Retrieval Codes

论文作者

Qian, Chengyuan, Zhou, Ruida, Tian, Chao, Liu, Tie

论文摘要

我们研究弱私人信息检索(W-PIR)的问题,在该问题中,用户希望以$ n $非胶卷服务器的方式检索所需的消息,以至于有关所需消息的身份的隐私泄漏小于或等于阈值。我们提出了一种新的代码构建,该构建基于以下批判性观察,可以显着改善文献中最著名的结果。在以前的构造中,对于最低下载的极端情况,检索模式是直接从$ n-1 $服务器下载消息;但是,这会导致所有这些$ N-1 $服务器的泄漏,而这种极端情况的更好检索模式是直接从单个服务器下载该消息。提出的代码构建允许自然过渡到这种模式,对于最大泄漏度量和相互信息泄漏度量,可以获得重大改进。与Lin等人的先前工作相比,我们提供了明确的解决方案,在该工作中仅获得了数值解。

We study the problem of weakly private information retrieval (W-PIR), where a user wishes to retrieve a desired message from $N$ non-colluding servers in a way that the privacy leakage regarding the desired message's identity is less than or equal to a threshold. We propose a new code construction which significantly improves upon the best known result in the literature, based on the following critical observation. In previous constructions, for the extreme case of minimum download, the retrieval pattern is to download the message directly from $N-1$ servers; however this causes leakage to all these $N-1$ servers, and a better retrieval pattern for this extreme case is to download the message directly from a single server. The proposed code construction allows a natural transition to such a pattern, and for both the maximal leakage metric and the mutual information leakage metric, significant improvements can be obtained. We provide explicit solutions, in contrast to a previous work by Lin et al., where only numerical solutions were obtained.

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