Paper 2025/764 Original: eprint.iacr.org/2025/764 ↗
Security of a secret sharing protocol on the Qline
Abstract
Secret sharing is a fundamental primitive in cryptography, and it can be achieved even with perfect security. However, the distribution of shares requires computational assumptions, which can compromise the overall security of the protocol. While traditional Quantum Key Distribution (QKD) can maintain security, its widespread deployment in general networks would incur prohibitive costs. In this work, we present a quantum protocol for distributing additive secret sharing of 0, which we prove to be composably secure within the Abstract Cryptography framework. Moreover, our protocol targets the Qline, a recently proposed quantum network architecture designed to simplify and reduce the cost of quantum communication. Once the shares are distributed, they can be used to securely perform a wide range of cryptographic tasks, including standard additive secret sharing, anonymous veto, and symmetric key establishment.
Metadata
- Available format(s)
PDF- Category
- Cryptographic protocols
- Publication info
- Preprint.
- History
- 2025-04-29: last updated
- 2025-04-29: published
- Short URL
- https://ia.cr/2025/764
- License
- https://creativecommons.org/licenses/by/4.0/
BibTeX
@misc{cryptoeprint:2025/764,
author = {Alex B. Grilo and Lucas Hanouz and Anne Marin},
title = {Security of a secret sharing protocol on the Qline},
howpublished = {Cryptology {ePrint} Archive, Paper 2025/764},
year = {2025},
url = {https://eprint.iacr.org/2025/764}
}