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From Partial to Global Asynchronous Reliable Broadcast

Authors Diana Ghinea, Martin Hirt, Chen-Da Liu-Zhang

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Diana Ghinea
  • Department of Computer Science, ETH Zurich, Switzerland
Martin Hirt
  • Department of Computer Science, ETH Zurich, Switzerland
Chen-Da Liu-Zhang
  • Department of Computer Science, ETH Zurich, Switzerland

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Diana Ghinea, Martin Hirt, and Chen-Da Liu-Zhang. From Partial to Global Asynchronous Reliable Broadcast. In 34th International Symposium on Distributed Computing (DISC 2020). Leibniz International Proceedings in Informatics (LIPIcs), Volume 179, pp. 29:1-29:16, Schloss Dagstuhl - Leibniz-Zentrum für Informatik (2020)


Broadcast is a fundamental primitive in distributed computing. It allows a sender to consistently distribute a message among n recipients. The seminal result of Pease et al. [JACM'80] shows that in a complete network of synchronous bilateral channels, broadcast is achievable if and only if the number of corruptions is bounded by t < n/3. To overcome this bound, a fascinating line of works, Fitzi and Maurer [STOC'00], Considine et al. [JC'05], and Raykov [ICALP'15], proposed strengthening the communication network by assuming partial synchronous broadcast channels, which guarantee consistency among a subset of recipients. We extend this line of research to the asynchronous setting. We consider reliable broadcast protocols assuming a communication network which provides each subset of b parties with reliable broadcast channels. A natural question is to investigate the trade-off between the size b and the corruption threshold t. We answer this question by showing feasibility and impossibility results: - A reliable broadcast protocol Π_{RBC} that: - For 3 ≤ b ≤ 4, is secure up to t < n/2 corruptions. - For b > 4 even, is secure up to t < ((b-4)/(b-2) n + 8/(b-2)) corruptions. - For b > 4 odd, is secure up to t < ((b-3)/(b-1) n + 6/(b-1)) corruptions. - A nonstop reliable broadcast Π_{nRBC}, where parties are guaranteed to obtain output as in reliable broadcast but may need to run forever, secure up to t < (b-1)/(b+1) n corruptions. - There is no protocol for (nonstop) reliable broadcast secure up to t ≥ (b-1)/(b+1) n corruptions, implying that Π_{RBC} is an asymptotically optimal reliable broadcast protocol, and Π_{nRBC} is an optimal nonstop reliable broadcast protocol.

Subject Classification

ACM Subject Classification
  • Theory of computation → Cryptographic protocols
  • Theory of computation → Distributed algorithms
  • Security and privacy → Cryptography
  • asynchronous broadcast
  • partial broadcast


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