Communication-Efficient BFT Using Small Trusted Hardware to Tolerate Minority Corruption

Authors Sravya Yandamuri, Ittai Abraham, Kartik Nayak, Michael K. Reiter

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Sravya Yandamuri
  • Duke University, Durham, NC, USA
Ittai Abraham
  • VMware Research, Herzliya, Israel
Kartik Nayak
  • Duke University, Durham, NC, USA
Michael K. Reiter
  • Duke University, Durham, NC, USA

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Sravya Yandamuri, Ittai Abraham, Kartik Nayak, and Michael K. Reiter. Communication-Efficient BFT Using Small Trusted Hardware to Tolerate Minority Corruption. In 26th International Conference on Principles of Distributed Systems (OPODIS 2022). Leibniz International Proceedings in Informatics (LIPIcs), Volume 253, pp. 24:1-24:23, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2023)


Agreement protocols for partially synchronous networks tolerate fewer than one-third Byzantine faults. If parties are equipped with trusted hardware that prevents equivocation, then fault tolerance can be improved to fewer than one-half Byzantine faults, but typically at the cost of increased communication complexity. In this work, we present results that use small trusted hardware without worsening communication complexity assuming the adversary controls a fraction of the network that is less than one-half. In particular, we show a version of HotStuff that retains linear communication complexity in each view, leveraging trusted hardware to tolerate a minority of corruptions. Our result uses expander graph techniques to achieve efficient communication in a manner that may be of independent interest.

Subject Classification

ACM Subject Classification
  • Theory of computation → Communication complexity
  • communication complexity
  • consensus
  • trusted hardware


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