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arXiv 1901.07490cs.ITmath.IT
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一种新的存储受限数据库私有信息检索设计

A New Design of Private Information Retrieval for Storage Constrained Databases

Nicholas Woolsey, Rong-Rong Chen, Mingyue Ji

摘要:

专用信息检索(PIR)允许用户从$N$数据库下载$K$消息之一,而不向任何数据库透露正在下载哪个$K$消息。通常,数据库可以是存储受限的,其中每个数据库最多只能存储$μK L$位,其中$\frac{1}{N} \leq μ\leq 1$和$L$是每个消息的位大小。让$t= μN$,最近的工作表明,存储约束PIR(SC-PIR)的容量是$\left( 1+ \frac{1}{t} + \frac{1}{t^2} + \cdots + \frac{1}{t^{K-1}} \right)^{-1}$,这是通过一个存储布局方案的启发内容布局方案在文献中的编码缓存和原始PIR计划。毫不奇怪,这种可实现的方案要求每个消息的长度为$L = {N \choose t}t^K$位,这可能是不切实际的。在本文中,没有试图使SC-PIR和编码缓存问题之间的联系,基于全存储PIR(FS-PIR)问题($μ= 1$)和SC-PIR问题之间的一般联系,我们提出了一个新的SC-PIR设计思想,使用新的存储布局方案。所提出的方案显着降低了消息大小的要求,同时仍然满足容量的SC-PIR。特别地,与现有技术的$L = {N \choose t}t^K$相比,所提出的SC-PIR方案要求每个文件的大小仅为$L = Nt^{K-1}$。因此,我们得出结论,PIR可能不符合编码缓存时,$L$的大小受到约束。

英文摘要:

Private information retrieval (PIR) allows a user to download one of $K$ messages from $N$ databases without revealing to any database which of the $K$ messages is being downloaded. In general, the databases can be storage constrained where each database can only store up to $μK L$ bits where $\frac{1}{N} \leq μ\leq 1$ and $L$ is the size of each message in bits. Let $t= μN$, a recent work showed that the capacity of Storage Constrained PIR (SC-PIR) is $\left( 1+ \frac{1}{t} + \frac{1}{t^2} + \cdots + \frac{1}{t^{K-1}} \right)^{-1}$, which is achieved by a storage placement scheme inspired by the content placement scheme in the literature of coded caching and the original PIR scheme. Not surprisingly, this achievable scheme requires that each message is $L = {N \choose t}t^K$ bits in length, which can be impractical. In this paper, without trying to make the connection between SC-PIR and coded caching problems, based on a general connection between the Full Storage PIR (FS-PIR) problem ($μ= 1$) and SC-PIR problem, we propose a new SC-PIR design idea using novel storage placement schemes. The proposed schemes significantly reduce the message size requirement while still meeting the capacity of SC-PIR. In particular, the proposed SC-PIR schemes require the size of each file to be only $L = Nt^{K-1}$ compared to the state-of-the-art $L = {N \choose t}t^K$. Hence, we conclude that PIR may not meet coded caching when the size of $L$ is constrained.

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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