Outsourced Private Information Retrieval with Pricing and Access Control

In this paper, the authors propose a scheme for outsourcing Private Information Retrieval (PIR) to untrusted servers while protecting the privacy of the database owner as well as that of the database clients. They observe that by layering PIR on top of an Oblivious RAM (ORAM) data layout, they provide the ability for the database owner to perform private writes, while database clients can perform private reads from the database even while the owner is offline. They can also enforce pricing and access control on a per-record basis for these reads.

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University of Waterloo