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arXiv 1602.01458cs.ITmath.IT
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分布式存储系统中基于MDS编码数据的私有信息检索

Private Information Retrieval from MDS Coded Data in Distributed Storage Systems

Razan Tajeddine, Oliver W. Gnilke, Salim El Rouayheb

摘要:

在私有信息检索(PIR)的意义上,从分布式存储系统(DSS)的数据请求的用户提供隐私的问题被认为是。DSS由$(n,k,d)$最大距离可分离(MDS)码编码,以将数据可靠地存储在不可靠的存储节点上。这些节点中的一些可以是间谍,其向第三方(例如压迫政权)报告用户正在请求哪些数据。一个信息理论的PIR计划,确保用户可以满足其请求,同时透露,间谍节点,没有信息的数据正在被请求。用户可以通过下载DSS中的所有数据来轻松实现PIR。然而,由于其高通信成本,这不是可行的解决方案。我们构造了具有低下载通信代价的PIR方案。当DSS中存在$b=1$间谍节点时,我们构造了单位请求数据的下载代价为$\frac{1}{1-R}$($R=k/n$为码率)的PIR方案,达到了线性方案的信息论极限.所提出的方案是通用的,因为它们依赖于码率,但不依赖于代码的生成矩阵。当$b\leq n-δk$时,对于某些$δ\in \mathbb{N^+}$,我们用$cPoP = \frac{b+δk}δ$构造了线性PIR格式.

英文摘要:

The problem of providing privacy, in the private information retrieval (PIR) sense, to users requesting data from a distributed storage system (DSS), is considered. The DSS is coded by an $(n,k,d)$ Maximum Distance Separable (MDS) code to store the data reliably on unreliable storage nodes. Some of these nodes can be spies which report to a third party, such as an oppressive regime, which data is being requested by the user. An information theoretic PIR scheme ensures that a user can satisfy its request while revealing, to the spy nodes, no information on which data is being requested. A user can trivially achieve PIR by downloading all the data in the DSS. However, this is not a feasible solution due to its high communication cost. We construct PIR schemes with low download communication cost. When there is $b=1$ spy node in the DSS, we construct PIR schemes with download cost $\frac{1}{1-R}$ per unit of requested data ($R=k/n$ is the code rate), achieving the information theoretic limit for linear schemes. The proposed schemes are universal since they depend on the code rate, but not on the generator matrix of the code. Also, when $b\leq n-δk$, for some $δ\in \mathbb{N^+}$, we construct linear PIR schemes with $cPoP = \frac{b+δk}δ$.

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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