MULTISS: Long-Term Secure Distributed Storage over Remote QKD Networks

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We introduce MULTISS, a distributed storage protocol over multiple remote Quantum Key Distribution (QKD) networks that ensures long-term data confidentiality. MULTISS is designed to combine several QKD networks, as QKD links are inherently limited in range, and to connect these networks through classical cryptographic channels. It relies on a hierarchical secret sharing scheme that makes certain shares mandatory for the reconstruction of the original secret. Hence, MULTISS offers a secure distri