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Quantum-Seeded Distributed Post-Quantum Group Signatures for 5G V2X Communications

P. Blanco-Casal, P. Rejo-Iglesias, D. Cajaraville-Aboy, J. Vecino-Peñas, R. P. Díaz-Redondo, A. Fernández-Vilas, M. Fernández Veiga · 2026 · arXiv

DOI: 10.48550/arXiv.2610.27316 · open-access PDF

Spanish

Las comunicaciones Vehículo-a-Todo (V2X) se basan en las firmas en curva elíptica que rompe un adversario cuántico y en certificados pseudónimos cuya anonimato se basa en la tasa de rotación, no en la criptografía. Este trabajo presenta qDGSP, una infraestructura post-cuántica V2X: un esquema de firma de grupo dinámico basado en hash (DGSP, sobre SPHINCS+ y WOTS+) distribuido entre un controlador central y los verificadores del lado de la carretera. Las llaves de grupo derivan deterministicamente de las semillas de distribución de llaves cuánticas (QKD) servidas a través de la interfaz ETSI GS QKD 014, por lo que ninguna firma de grupo se cruza el canal clásico.

Machine translation (Meta M2M100); the English original follows.

Abstract

Vehicle-to-Everything (V2X) communications rely on elliptic-curve signatures that a quantum adversary breaks and on pseudonym certificates whose anonymity rests on rotation rate, not cryptography. This work presents qDGSP, a post-quantum V2X infrastructure: a hash-based dynamic group signature scheme (DGSP, over SPHINCS+ and WOTS+) distributed between a central controller and roadside verifiers. Group keys derive deterministically from quantum key distribution (QKD) seeds served over the ETSI GS QKD 014 interface, so no group-signature secret crosses the classical channel. qDGSP-EA (Ephemeral

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