The Capacity of Single-Server Weakly-Private Information Retrieval
Artikel i vetenskaplig tidskrift, 2021

A private information retrieval (PIR) protocol guar- antees that a user can privately retrieve files stored in a database without revealing any information about the identity of the requested file. Existing information-theoretic PIR proto- cols ensure perfect privacy, i.e., zero information leakage to the servers storing the database, but at the cost of high download. In this work, we present weakly-private information retrieval (WPIR) schemes that trade off perfect privacy to improve the download cost when the database is stored on a single server. We study the tradeoff between the download cost and information leakage in terms of mutual information (MI) and maximal leak- age (MaxL) privacy metrics. By relating the WPIR problem to rate-distortion theory, the download-leakage function, which is defined as the minimum required download cost of all single- server WPIR schemes for a given level of information leakage and a fixed file size, is introduced. By characterizing the download- leakage function for the MI and MaxL metrics, the capacity of single-server WPIR is fully described.

Författare

Hsuan Yin Lin

Siddhartha Kumar

Eirik Rosnes

Alexandre Graell I Amat

Chalmers, Elektroteknik, Kommunikations- och antennsystem, Kommunikationssystem

Eitan Yaakobi

IEEE Journal on Selected Areas in Information Theory

2641-8770 (eISSN)

Vol. 2 1 415-427

Distribuerad lagring för datalagring och trådlös leverans av data

Vetenskapsrådet (VR), 2016-01-01 -- 2019-12-31.

Ämneskategorier

Annan data- och informationsvetenskap

Biblioteks- och informationsvetenskap

Kommunikationssystem

Styrkeområden

Informations- och kommunikationsteknik

DOI

10.1109/JSAIT.2021.3056327

Mer information

Skapat

2021-04-16