Synchronous Byzantine Agreement with Expected $O(1)$ Rounds, Expected $O(n^2)$ Communication, and Optimal Resilience

Ittai Abraham; Srinivas Devadas; Danny Dolev; Kartik Nayak; Ling Ren

Paper 2018/1028

Synchronous Byzantine Agreement with Expected $O(1)$ Rounds, Expected $O(n^2)$ Communication, and Optimal Resilience

Ittai Abraham, Srinivas Devadas, Danny Dolev, Kartik Nayak, and Ling Ren

Abstract

We present new protocols for Byzantine agreement in the synchronous and authenticated setting, tolerating the optimal number of $f$ faults among $n=2f+1$ parties. Our protocols achieve an expected $O(1)$ round complexity and an expected $O(n^2)$ communication complexity. The exact round complexity in expectation is 10 for a static adversary and 16 for a strongly rushing adaptive adversary. For comparison, previous protocols in the same setting require expected 29 rounds.

Metadata

Available format(s): PDF
Publication info: Published elsewhere. Minor revision. Financial Cryptography and Data Security 2019
Contact author(s): renling8 @ gmail com
History: 2019-03-06: last of 2 revisions; 2018-10-26: received; See all versions
Short URL: https://ia.cr/2018/1028
License: CC BY

BibTeX

@misc{cryptoeprint:2018/1028,
      author = {Ittai Abraham and Srinivas Devadas and Danny Dolev and Kartik Nayak and Ling Ren},
      title = {Synchronous Byzantine Agreement with Expected $O(1)$ Rounds, Expected $O(n^2)$ Communication, and Optimal Resilience},
      howpublished = {Cryptology {ePrint} Archive, Paper 2018/1028},
      year = {2018},
      url = {https://eprint.iacr.org/2018/1028}
}