Technical Program

Paper Detail

Paper Title Weakly-Private Information Retrieval
Paper IdentifierTU4.R3.1
Authors Hsuan-Yin Lin, Siddhartha Kumar, Eirik Rosnes, Simula UiB, Norway; Alexandre Graell i Amat, Chalmers University of Technology, Sweden; Eitan Yaakobi, Israel Institute of Technology, Israel
Session Private Information Retrieval III
Location Monge, Level 3
Session Time Tuesday, 09 July, 16:40 - 18:00
Presentation Time Tuesday, 09 July, 16:40 - 17:00
Manuscript  Click here to download the manuscript
Abstract 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.