arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2201.11605cs.ITcs.IRmath.IT
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可重用和一次性辅助信息在私人信息检索中的作用

The Role of Reusable and Single-Use Side Information in Private Information Retrieval

Anoosheh Heidarzadeh, Alex Sprintson

摘要:

介绍了可重用单次使用边信息的私有信息检索问题。在这个问题中,一个或多个远程服务器存储一组$K$消息的相同副本,并且存在最初知道这些消息的$M$的用户,并且想要私下地从该组$K$消息中检索另一个消息。目标是设计一种检索方案,其中用户从服务器下载最少量的信息,同时用户想要的消息的身份和用户已知的$M_1$($M$消息的子集)的身份(称为可重用辅助信息)受到保护,但是不需要保护用户已知的剩余$M_2=M-M_1$消息的标识(称为一次性辅助信息)。当${M_1=M_2=0}$时,PIR-RSSI问题简化为经典的私有信息检索(PIR)问题,并且当${M_1\geq 1,M_2=0}$或${M_1=0,M_2\geq 1}$时,分别简化为具有私有边信息的PIR或具有边信息的PIR问题。在这项工作中,我们专注于PIR-RSSI问题的单服务器设置。我们的特点的能力,这种设置的情况下,${M_1=1,M_2\geq 1}$和${M_1\geq 1,M_2=1}$,其中的容量被定义为最大可实现的下载速率在所有PIR-RSSI方案。我们的研究结果表明,对于足够小的值的$K$,单次使用的边信息消息可以帮助降低下载成本,只有当它们保持私有;和较大的值的$K$,可重复使用的边信息消息不能帮助降低下载成本。

英文摘要:

This paper introduces the problem of Private Information Retrieval with Reusable and Single-use Side Information (PIR-RSSI). In this problem, one or more remote servers store identical copies of a set of $K$ messages, and there is a user that initially knows $M$ of these messages, and wants to privately retrieve one other message from the set of $K$ messages. The objective is to design a retrieval scheme in which the user downloads the minimum amount of information from the server(s) while the identity of the message wanted by the user and the identities of an $M_1$-subset of the $M$ messages known by the user (referred to as reusable side information) are protected, but the identities of the remaining $M_2=M-M_1$ messages known by the user (referred to as single-use side information) do not need to be protected. The PIR-RSSI problem reduces to the classical Private Information Retrieval (PIR) problem when ${M_1=M_2=0}$, and reduces to the problem of PIR with Private Side Information or PIR with Side Information when ${M_1\geq 1,M_2=0}$ or ${M_1=0,M_2\geq 1}$, respectively. In this work, we focus on the single-server setting of the PIR-RSSI problem. We characterize the capacity of this setting for the cases of ${M_1=1,M_2\geq 1}$ and ${M_1\geq 1,M_2=1}$, where the capacity is defined as the maximum achievable download rate over all PIR-RSSI schemes. Our results show that for sufficiently small values of $K$, the single-use side information messages can help in reducing the download cost only if they are kept private; and for larger values of $K$, the reusable side information messages cannot help in reducing the download cost.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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