International Association for Cryptologic Research

International Association
for Cryptologic Research


Paper: On the Bottleneck Complexity of MPC with Correlated Randomness

Claudio Orlandi , Aarhus University
Divya Ravi , Aarhus University
Peter Scholl , Aarhus University
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Conference: PKC 2022
Abstract: At ICALP 2018, Boyle et al. introduced the notion of the \emph{bottleneck complexity} of a secure multi-party computation (MPC) protocol. This measures the maximum communication complexity of any one party in the protocol, aiming to improve load-balancing among the parties. In this work, we study the bottleneck complexity of MPC in the preprocessing model, where parties are given correlated randomness ahead of time. We present two constructions of \emph{bottleneck-efficient} MPC protocols, whose bottleneck complexity is independent of the number of parties: 1. A protocol for computing abelian programs, based only on one-way functions. 2. A protocol for selection functions, based on any linearly homomorphic encryption scheme. Compared with previous bottleneck-efficient constructions, our protocols can be based on a wider range of assumptions, and avoid the use of fully homomorphic encryption.
Video from PKC 2022
  title={On the Bottleneck Complexity of MPC with Correlated Randomness},
  author={Claudio Orlandi and Divya Ravi and Peter Scholl},