Weakly-Private Information Retrieval
Paper in proceedings, 2019

Private information retrieval (PIR) protocols make it possible to retrieve a file from a database without disclosing any information about the identity of the file being retrieved. These protocols have been rigorously explored from an information-theoretic perspective in recent years. While existing protocols strictly impose that no information is leaked on the file’s identity, this work initiates the study of the tradeoffs that can be achieved by relaxing the requirement of perfect privacy. In case the user is willing to leak some information on the identity of the retrieved file, we study how the PIR rate, as well as the upload cost and access complexity, can be improved. For the particular case of replicated servers, we propose two weakly-private information retrieval schemes based on two recent PIR protocols and a family of schemes based on partitioning. Lastly, we compare the performance of the proposed schemes.

Information theory

Information retrieval


H.-Y. Lin

Simula UiB

Siddhartha Kumar

Simula UiB

Eirik Rosnes

Simula UiB

Alexandre Graell I Amat

Chalmers, Electrical Engineering, Communication and Antenna Systems, Communication Systems

E. Yaakobi

Technion – Israel Institute of Technology

IEEE International Symposium on Information Theory - Proceedings

21578095 (ISSN)

Vol. 2019 1257-1261 8849444
978-153869291-2 (ISBN)

IEEE International Symposium on Information Theory (ISIT)
Paris, France,

Rethinking Distributed Storage for Data Storage and Wireless Content Delivery

Swedish Research Council (VR), 2016-01-01 -- 2019-12-31.

Subject Categories


Communication Systems

Control Engineering

Computer Science



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