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Better Safe than Sorry: Recovering after Adversarial Majority
October 10, 2023 Β· Declared Dead Β· π IACR Cryptology ePrint Archive
"No code URL or promise found in abstract"
Evidence collected by the PWNC Scanner
Authors
Srivatsan Sridhar, Dionysis Zindros, David Tse
arXiv ID
2310.06338
Category
cs.CR: Cryptography & Security
Cross-listed
cs.DC
Citations
12
Venue
IACR Cryptology ePrint Archive
Last Checked
4 months ago
Abstract
The security of blockchain protocols is a combination of two properties: safety and liveness. It is well known that no blockchain protocol can provide both to sleepy (intermittently online) clients under adversarial majority. However, safety is more critical in that a single safety violation can cause users to lose money. At the same time, liveness must not be lost forever. We show that, in a synchronous network, it is possible to maintain safety for all clients even during adversarial majority, and recover liveness after honest majority is restored. Our solution takes the form of a recovery gadget that can be applied to any protocol with certificates (such as HotStuff, Streamlet, Tendermint, and their variants).
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