Optimal Good-case Latency for Rotating Leader Synchronous BFT

Ittai Abraham; Kartik Nayak; Nibesh Shrestha

Paper 2021/1138

Optimal Good-case Latency for Rotating Leader Synchronous BFT

Ittai Abraham, VMware Research

Kartik Nayak, Duke University

Nibesh Shrestha, Rochester Institute of Technology

Abstract

This paper explores the good-case latency of synchronous Byzantine Fault Tolerant (BFT) consensus protocols in the rotating leader setting. We first present a lower bound that relates the latency of a broadcast when the sender is honest and the latency of switching to the next sender. We then present a matching upper bound with a latency of $2 Δ$ ( $Δ$ is the pessimistic synchronous delay) with an optimistically responsive change to the next sender. The results imply that both our lower and upper bounds are tight. We implement and evaluate our protocol and show that our protocol obtains similar latency compared to state-of-the-art stable-leader protocol Sync~HotStuff while allowing optimistically responsive leader rotation.

Metadata

Available format(s): PDF
Category: Foundations
Publication info: Published elsewhere. OPODIS 2021
DOI: 10.4230/LIPIcs.OPODIS.2021.27
Keywords: Distributed computing blockchains consensus protocols SMR Synchrony optimistic responsiveness
Contact author(s): nxs4564 @ rit edu
History: 2023-06-23: revised; 2021-09-07: received; See all versions
Short URL: https://ia.cr/2021/1138
License: CC BY

BibTeX

@misc{cryptoeprint:2021/1138,
      author = {Ittai Abraham and Kartik Nayak and Nibesh Shrestha},
      title = {Optimal Good-case Latency for Rotating Leader Synchronous {BFT}},
      howpublished = {Cryptology {ePrint} Archive, Paper 2021/1138},
      year = {2021},
      doi = {10.4230/LIPIcs.OPODIS.2021.27},
      url = {https://eprint.iacr.org/2021/1138}
}