Work

Security of a Secret Sharing Protocol on the Qline

Year: 2026

Type: conference-paper

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.

Source: International Conference on Quantum Communications, Networking, and Computing (QCNC)

DOI: 10.1109/qcnc69040.2026.00056

Authors: Alex B. Grilo, Lucas Hanouz, Anne Marin

Institutions: Centre National de la Recherche Scientifique, Sorbonne Université, LIP6

Language: English

Topic: Quantum Information and Cryptography

Subfield: Artificial Intelligence

Field: Computer Science

Domain: Physical Sciences

Open Access status: green

Funders: European Commission, Agence Nationale de la Recherche, HORIZON EUROPE Framework Programme

Awards: G1190173965, Quantum Internet Alliance - Phase1, Initiative Nationale Hybride HPC Quantique – R&D et Support des communautés, G4492039195, G6796242504