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Unit 42

eess.SP updates on arXiv.org

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Symmetric Private Information Retrieval with User-Side Co...
Zhusheng Wang, Sennur Ulukus · 2021-05-13 · via eess.SP updates on arXiv.org

We consider the problem of symmetric private information retrieval (SPIR) with user-side common randomness. In SPIR, a user retrieves a message out of $K$ messages from $N$ non-colluding and replicated databases in such a way that no single database knows the retrieved message index (user privacy), and the user gets to know nothing further than the retrieved message (database privacy). SPIR has a capacity smaller than the PIR capacity which requires only user privacy, is infeasible in the case of a single database, and requires shared common randomness among the databases. We introduce a new variant of SPIR where the user is provided with a random subset of the shared database common randomness, which is unknown to the databases. We determine the exact capacity region of the triple $(d, ρ_S, ρ_U)$, where $d$ is the download cost, $ρ_S$ is the amount of shared database (server) common randomness, and $ρ_U$ is the amount of available user-side common randomness. We show that with a suitable amount of $ρ_U$, this new SPIR achieves the capacity of conventional PIR. As a corollary, single-database SPIR becomes feasible. Further, the presence of user-side $ρ_U$ reduces the amount of required server-side $ρ_S$.