Fast Byzantine Total Order Broadcast
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arXiv
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| Format: | Preprint |
| Published: |
2024
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| _version_ | 1866913148593766400 |
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| author | Monti, Matteo Camaioni, Martina Roman, Pierre-Louis |
| author_facet | Monti, Matteo Camaioni, Martina Roman, Pierre-Louis |
| contents | This paper presents Flutter, the first Byzantine Total Order Broadcast implementation with a broadcast-to-delivery latency of $2Δ+ ε$ time units, $Δ$ being the message delay and $ε$ an arbitrarily small constant margin, when all processes are correct, the network is synchronous, hence local clocks are well-synchronized. Under the same conditions, state-of-the-art protocols require at least $3Δ$ time units in practical deployments where clients differ from servers. We prove Flutter's good-case latency is quasi-optimal, meaning it cannot be improved upon by any finite amount. Flutter is deterministic, leaderless, and signature-free hence quantum-resilient; it assumes partial synchrony and at least $5f + 1$ servers, where $f$ bounds the number of faults. Under the hood, Flutter builds upon Blink, a novel Binary Consensus implementation with Representative Validity, whose fast path enables decisions in $Δ$ time units when all correct servers propose the same value. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2412_14061 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Fast Byzantine Total Order Broadcast Monti, Matteo Camaioni, Martina Roman, Pierre-Louis Distributed, Parallel, and Cluster Computing This paper presents Flutter, the first Byzantine Total Order Broadcast implementation with a broadcast-to-delivery latency of $2Δ+ ε$ time units, $Δ$ being the message delay and $ε$ an arbitrarily small constant margin, when all processes are correct, the network is synchronous, hence local clocks are well-synchronized. Under the same conditions, state-of-the-art protocols require at least $3Δ$ time units in practical deployments where clients differ from servers. We prove Flutter's good-case latency is quasi-optimal, meaning it cannot be improved upon by any finite amount. Flutter is deterministic, leaderless, and signature-free hence quantum-resilient; it assumes partial synchrony and at least $5f + 1$ servers, where $f$ bounds the number of faults. Under the hood, Flutter builds upon Blink, a novel Binary Consensus implementation with Representative Validity, whose fast path enables decisions in $Δ$ time units when all correct servers propose the same value. |
| title | Fast Byzantine Total Order Broadcast |
| topic | Distributed, Parallel, and Cluster Computing |
| url | https://arxiv.org/abs/2412.14061 |