License: Creative Commons Attribution 4.0 International license (CC BY 4.0)
When quoting this document, please refer to the following
DOI: 10.4230/LIPIcs.DISC.2022.38
URN: urn:nbn:de:0030-drops-172292
URL: http://dagstuhl.sunsite.rwth-aachen.de/volltexte/2022/17229/
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Abraham, Ittai ; Dolev, Danny ; Kagan, Alon ; Stern, Gilad

Brief Announcement: Authenticated Consensus in Synchronous Systems with Mixed Faults

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LIPIcs-DISC-2022-38.pdf (0.4 MB)

Abstract

Protocols solving authenticated consensus in synchronous networks with Byzantine faults have been widely researched and known to exists if and only if n > 2f for f Byzantine faults. Similarly, protocols solving authenticated consensus in partially synchronous networks are known to exist if n > 3f+2k for f Byzantine faults and k crash faults. In this work we fill a natural gap in our knowledge by presenting MixSync, an authenticated consensus protocol in synchronous networks resilient to f Byzantine faults and k crash faults if n > 2f+k. As a basic building block, we first define and then construct a publicly verifiable crusader agreement protocol with the same resilience. The protocol uses a simple double-send round to guarantee non-equivocation, a technique later used in the MixSync protocol. We then discuss how to construct a state machine replication protocol using these ideas, and how they can be used in general to make such protocols resilient to crash faults. Finally, we prove lower bounds showing that n > 2f+k is optimally resilient for consensus and state machine replication protocols.

BibTeX - Entry

@InProceedings{abraham_et_al:LIPIcs.DISC.2022.38,
  author =	{Abraham, Ittai and Dolev, Danny and Kagan, Alon and Stern, Gilad},
  title =	{{Brief Announcement: Authenticated Consensus in Synchronous Systems with Mixed Faults}},
  booktitle =	{36th International Symposium on Distributed Computing (DISC 2022)},
  pages =	{38:1--38:3},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-255-6},
  ISSN =	{1868-8969},
  year =	{2022},
  volume =	{246},
  editor =	{Scheideler, Christian},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/opus/volltexte/2022/17229},
  URN =		{urn:nbn:de:0030-drops-172292},
  doi =		{10.4230/LIPIcs.DISC.2022.38},
  annote =	{Keywords: consensus, state machine replication, mixed faults, synchrony, lower bounds}
}

Keywords: consensus, state machine replication, mixed faults, synchrony, lower bounds
Collection: 36th International Symposium on Distributed Computing (DISC 2022)
Issue Date: 2022
Date of publication: 17.10.2022

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