Efficient Single-Server Stateful PIR Using Format-Preserving Encryption

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Recently, Stateful Private Information Retrieval (PIR) has emerged as a promising new paradigm of PIR. Despite significant recent progress, state-of-the-art single-server schemes in this paradigm still suffer from practical inefficiencies in communication, computation, and/or client storage. In this work, we construct a new single-server stateful PIR scheme called HarmonyPIR that achieves efficient communication, computation, and client storage. From a technical standpoint, we build on the recen