Quantum Cadence proposes post-quantum consensus without quorum certificates
Original title: Quantum Cadence: Post-Quantum Consensus with Multiple Concurrent Proposers
In 200-validator simulations, Quantum Chorus matches Chorus latency and scales better as the number of proposers grows.
Quantum Cadence is a post-quantum consensus design with multiple concurrent proposers that drops quorum certificates. Validators count quorums among messages they have received; safety and liveness do not depend on signatures, though signatures are added for accountability. Quantum Chorus keeps Chorus's fast path of dissemination plus two vote rounds and falls back to Coda, a signature-free Byzantine agreement. The paper also outlines adapting Cadence's Conductor slot scheduler.
- No known post-quantum scheme matches BLS aggregate size and aggregation time.
- Fast path is dissemination followed by two rounds of votes.
- A failed fast path runs Coda, signature-free agreement for multiple proposers.
- Simulations used 200 validators.
From the original article
1 min read at arxiv.orgThe consensus protocols of most high-performance blockchains use quorum certificates, which bundle the signatures of a quorum of validators. Signature schemes such as BLS can aggregate the signatures of a whole quorum into a single short signature, which keeps these certificates small.
By Mohammad Mussadiq Jalalzai · arxiv.org
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