Paper 2024/561
SQIAsignHD: SQIsignHD Adaptor Signature
Abstract
Adaptor signatures can be viewed as a generalized form of standard digital signature schemes by linking message authentication to the disclosure of a secret value. As a recent cryptographic primitive, they have become essential for blockchain applications, including cryptocurrencies, by reducing on-chain costs, improving fungibility, and enabling off-chain payments in payment-channel networks, payment-channel hubs, and atomic swaps. However, existing adaptor signature constructions are vulnerable to quantum attacks due to Shor's algorithm. In this work, we introduce $\mathsf{SQIAsignHD}$, a new quantum-resistant adaptor signature scheme based on isogenies of supersingular elliptic curves, using SQIsignHD - as the underlying signature scheme - and exploiting the idea of the artificial orientation on the supersingular isogeny Diffie-Hellman key exchange protocol, SIDH, to define the underlying hard relation. We, furthermore, provide a formal security proof for our proposed scheme.
Metadata
- Available format(s)
-
PDF
- Category
- Public-key cryptography
- Publication info
- Preprint.
- Keywords
- Post-quantum CryptographyBlockchainIsogeny-based CryptographyAdaptor SignaturePayment Channel Network
- Contact author(s)
-
farzin renan @ gmail com
p kutas @ bham ac uk - History
- 2025-04-14: last of 2 revisions
- 2024-04-11: received
- See all versions
- Short URL
- https://ia.cr/2024/561
- License
-
CC BY
BibTeX
@misc{cryptoeprint:2024/561,
author = {Farzin Renan and Péter Kutas},
title = {{SQIAsignHD}: {SQIsignHD} Adaptor Signature},
howpublished = {Cryptology {ePrint} Archive, Paper 2024/561},
year = {2024},
url = {https://eprint.iacr.org/2024/561}
}