Near-Optimal Oblivious Key-Value Stores for Efficient PSI, PSU and Volume-Hiding Multi-Maps

ePrint Report: Near-Optimal Oblivious Key-Value Stores for Efficient PSI, PSU and Volume-Hiding Multi-Maps

Alexander Bienstock, Sarvar Patel, Joon Young Seo, Kevin Yeo

In this paper, we study oblivious key-value stores (OKVS) that enable encoding n key-value pairs into length $m$ encodings while hiding the input keys. The goal is to obtain high rate, $n/m$, with efficient encoding and decoding algorithms. We present $\mathsf{RB\text{-}OKVS}$ built on random band matrices that obtains near-optimal rates as high as 0.97 whereas prior works could …

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