[Resource Topic] 2018/1028: Synchronous Byzantine Agreement with Expected $O(1)$ Rounds, Expected $O(n^2)$ Communication, and Optimal Resilience

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

Authors: Ittai Abraham, Srinivas Devadas, Danny Dolev, Kartik Nayak, 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.

ePrint: https://eprint.iacr.org/2018/1028

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