Paper 2023/1347 Original: eprint.iacr.org/2023/1347 ↗
Decentralised Repeated Modular Squaring Service Revisited: Attack and Mitigation
Abstract
Repeated modular squaring plays a crucial role in various time-based cryptographic primitives, such as Time-Lock Puzzles and Verifiable Delay Functions. At ACM CCS 2021, Thyagarajan et al. introduced “OpenSquare”, a decentralised protocol that lets a client delegate the computation of repeated modular squaring to third-party servers while ensuring that these servers are compensated only if they deliver valid results. In this work, we unveil a significant vulnerability in OpenSquare, which enables servers to receive payments without fulfilling the delegated task. To tackle this issue, we present a series of mitigation measures.
Metadata
- Available format(s)
PDF- Category
- Cryptographic protocols
- Publication info
- Preprint.
- History
- 2024-05-07: last updated
- 2023-09-09: published
- Short URL
- https://ia.cr/2023/1347
- License
- https://creativecommons.org/licenses/by/4.0/
BibTeX
@misc{cryptoeprint:2023/1347,
author = {Aydin Abadi},
title = {Decentralised Repeated Modular Squaring Service Revisited: Attack and Mitigation},
howpublished = {Cryptology {ePrint} Archive, Paper 2023/1347},
year = {2023},
url = {https://eprint.iacr.org/2023/1347}
}