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arXiv 2402.02871cs.ITcs.CRmath.COmath.IT
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基于编码的单服务器私有信息检索:规避子查询攻击

Code-Based Single-Server Private Information Retrieval: Circumventing the Sub-Query Attack

Neehar Verma, Camilla Hollanti

AI总结:

本文针对基于随机线性码的单服务器计算私有信息检索方案,通过使查询子矩阵秩差异可忽略且与目标文件索引无关,规避了原有子查询攻击,并在多文件检索场景下保持与原始方案相当的速率。

摘要:

本文研究利用随机线性码从单服务器进行私有信息检索。提出了 Holzbaur、Hollanti 和 Wachter-Zeh 在 [Holzbaur et al., "Computational Code-Based Single-Server Private Information Retrieval", 2020 IEEE ISIT] 中提出的首个基于编码的单服务器计算 PIR 方案的修改版本。原始方案在 [Bordage et al., "On the privacy of a code-based single-server computational PIR scheme", Cryptogr. Comm., 2021] 中被一种攻击破解,该攻击源于用户查询的子矩阵中极可能出现的秩差异。本文通过确保子矩阵具有可忽略的秩差异来规避该攻击。此外,秩差异无法归因于所需文件索引,从而保证了方案的隐私性。在检索多个文件的情况下,修改后方案的速率基本不受影响,并与原始方案相当。

英文摘要:

Private information retrieval from a single server is considered, utilizing random linear codes. Presented is a modified version of the first code-based single-server computational PIR scheme proposed by Holzbaur, Hollanti, and Wachter-Zeh in [Holzbaur et al., "Computational Code-Based Single-Server Private Information Retrieval", 2020 IEEE ISIT]. The original scheme was broken in [Bordage et al., "On the privacy of a code-based single-server computational PIR scheme", Cryptogr. Comm., 2021] by an attack arising from highly probable rank differences in sub-matrices of the user's query. Here, this attack is now circumvented by ensuring that the sub-matrices have negligible rank difference. Furthermore, the rank difference cannot be attributed to the desired file index, thereby ensuring the privacy of the scheme. In the case of retrieving multiple files, the rate of the modified scheme is largely unaffected and at par with the original scheme.

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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