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Revisiting Fast Tendermint: An Agreement Violation and Two Repairs

Ranchal-Pedrosa, Alejandro
arXiv (All) · Papers
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and-cluster-computingcryptography-and-securitydistributedparallel
Fast Tendermint reduces Tendermint's good-case latency to two communication steps for n>=5f+1. We show that its published round-change rule violates Agreement: one Byzantine process suffices for every f>=1, and for f>=2 two Byzantine processes suffice without double signing. The failure occurs when
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