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Network Agnostic Perfectly Secure MPC Against General Adversaries

Authors Ananya Appan , Anirudh Chandramouli , Ashish Choudhury

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Author Details

Ananya Appan
  • University of Illinois at Urbana Champaign, USA
Anirudh Chandramouli
  • Bar-Ilan University, Ramat Gan, Israel
Ashish Choudhury
  • International Institute of Information Technology, Bangalore, India

Funding

  • Chandramouli, Anirudh: Supported by the Israel Science Foundation (grant No. 2439/20).
  • Choudhury, Ashish: This research is an outcome of the R&D work undertaken in the project under the Visvesvaraya PhD Scheme of Ministry of Electronics & Information Technology, Government of India, being implemented by Digital India Corporation (formerly Media Lab Asia). The author is also thankful to the Electronics, IT & BT Government of Karnataka for supporting this work under the CIET project.

Cite AsGet BibTex

Ananya Appan, Anirudh Chandramouli, and Ashish Choudhury. Network Agnostic Perfectly Secure MPC Against General Adversaries. In 37th International Symposium on Distributed Computing (DISC 2023). Leibniz International Proceedings in Informatics (LIPIcs), Volume 281, pp. 3:1-3:19, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2023)
https://doi.org/10.4230/LIPIcs.DISC.2023.3

Abstract

In this work, we study perfectly-secure multi-party computation (MPC) against general (non-threshold) adversaries. Known protocols are secure against 𝒬^{(3)} and 𝒬^{(4)} adversary structures in a synchronous and an asynchronous network respectively. We address the existence of a single protocol which remains secure against 𝒬^{(3)} and 𝒬^{(4)} adversary structures in a synchronous and in an asynchronous network respectively, where the parties are unaware of the network type. We design the first such protocol against general adversaries. Our result generalizes the result of Appan, Chandramouli and Choudhury (PODC 2022), which presents such a protocol against threshold adversaries.

Subject Classification

ACM Subject Classification
  • Security and privacy → Information-theoretic techniques
  • Theory of computation → Distributed algorithms
  • Theory of computation → Cryptographic protocols
  • Theory of computation → Communication complexity
Keywords
  • Verifiable Secret Sharing
  • Byzantine Agreement
  • Perfect Security

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