[Resource Topic] 2019/634: SpOT-Light: Lightweight Private Set Intersection from Sparse OT Extension

Welcome to the resource topic for 2019/634

SpOT-Light: Lightweight Private Set Intersection from Sparse OT Extension

Authors: Benny Pinkas, Mike Rosulek, Ni Trieu, Avishay Yanai


We describe a novel approach for two-party private set intersection (PSI) with semi-honest security. Compared to existing PSI protocols, ours has a more favorable balance between communication and computation. Specifically, our protocol has the lowest monetary cost of any known PSI protocol, when run over the Internet using cloud-based computing services (taking into account current rates for CPU + data). On slow networks (e.g., 10Mbps) our protocol is actually the fastest. Our novel underlying technique is a variant of oblivious transfer (OT) extension that we call sparse OT extension. Conceptually it can be thought of as a communication-efficient multipoint oblivious PRF evaluation. Our sparse OT technique relies heavily on manipulating high-degree polynomials over large finite fields (i.e. elements whose representation requires hundreds of bits). We introduce extensive algorithmic and engineering improvements for interpolation and multi-point evaluation of such polynomials, which we believe will be of independent interest. Finally, we present an extensive empirical comparison of state-of-the- art PSI protocols in several application scenarios and along several dimensions of measurement: running time, communication, peak memory consumption, and — arguably the most relevant metric for practice — monetary cost

ePrint: https://eprint.iacr.org/2019/634

Talk: https://www.youtube.com/watch?v=4rFwhz1LEx8

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