Paper 2020/1541 Original: eprint.iacr.org/2020/1541 ↗

PsiBench: Pragmatic Benchmark of Two-party Private Set Intersection.

Abstract

Private Set Intersection (PSI) allows two parties to obtain the intersection of their data sets while revealing nothing else. PSI is attractive in many scenarios and has wide applications in academia and industry. Over the last three decades, a large number of PSI protocols have been proposed using different cryptographic techniques, under different assumptions, for different scenarios. The inherent complexity, heterogeneous constructions, and rapid evolution of PSI protocols make it difficult to have a unified perspective and further promote the field. We make the following three contributions to present a pragmatic benchmark of two-party PSI. First, we propose the Map-and-Compare framework, which generalizes almost all efficient PSI constructions to date, and intuitively explains the idea and challenge of PSI constructions. Based on the framework, we divide existing proposals into several categories and perform a systematic analysis of the features and use cases of different PSI variants. Second, we present a Java-based benchmark library that implements almost all two-party PSI protocols (which are considered to define the state-of-the-art in terms of concrete performance) and supports rapid prototyping of new PSI protocols. Third, by using our library as a common ground, we provide a comprehensive and impartial comparison of all our PSI implementations in detail. We discuss the performance of different proposals in various settings.