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Hardness of Constant-Round Communication Complexity

Authors Shuichi Hirahara, Rahul Ilango, Bruno Loff

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Author Details

Shuichi Hirahara
  • National Institute of Informatics, Tokyo, Japan
Rahul Ilango
  • Massachusetts Institute of Technology, Cambridge, MA, USA
Bruno Loff
  • INESC-Tec and University of Porto, Portugal

Funding

  • Hirahara, Shuichi: This work was partly carried out during a visit supported by ACT-I, JST.
  • Ilango, Rahul: During this work, this author was funded by an Akamai Presidential Fellowship and by NSF Grants CCF-1741615 and CCF-1909429.
  • Loff, Bruno: This project was financed by the Portuguese funding agency, FCT - Fundação para a Ciência e a Tecnologia, within project UIDB/50014/2020. This work was partly carried out during a research visit conducted with support from DIMACS in association with its Special Focus on Lower Bounds.

Acknowledgements

The authors would like to thank Ryan Williams for his support, and for several discussions and suggestions, without which this paper would not have existed. The authors would also like to thank Igor Oliveira for helpful conversations about hardness of communication complexity.

Cite As Get BibTex

Shuichi Hirahara, Rahul Ilango, and Bruno Loff. Hardness of Constant-Round Communication Complexity. In 36th Computational Complexity Conference (CCC 2021). Leibniz International Proceedings in Informatics (LIPIcs), Volume 200, pp. 31:1-31:30, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2021) https://doi.org/10.4230/LIPIcs.CCC.2021.31

Abstract

How difficult is it to compute the communication complexity of a two-argument total Boolean function f:[N]×[N] → {0,1}, when it is given as an N×N binary matrix? In 2009, Kushilevitz and Weinreb showed that this problem is cryptographically hard, but it is still open whether it is NP-hard. 
In this work, we show that it is NP-hard to approximate the size (number of leaves) of the smallest constant-round protocol for a two-argument total Boolean function f:[N]×[N] → {0,1}, when it is given as an N×N binary matrix. Along the way to proving this, we show a new deterministic variant of the round elimination lemma, which may be of independent interest.

Subject Classification

ACM Subject Classification
  • Theory of computation → Communication complexity
  • Theory of computation → Problems, reductions and completeness
Keywords
  • NP-completeness
  • Communication Complexity
  • Round Elimination Lemma
  • Meta-Complexity

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