Two quantum protocols for secure blind decryption with two users preserve message and key secrecy, with the second also hiding the key index and remaining secure against post-protocol server collusion where the classical version fails.
Two- step quantum direct communication protocol using the Einstein- Podolsky-Rosen pair block,
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Higher-dimensional two-way QKD protocols using mutually unbiased bases and Heisenberg-Weyl operators yield secret keys for stronger individual attacks and improved robustness to collective eavesdropping via entropic uncertainty relations.
citing papers explorer
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Quantum secure blind decryption with two users
Two quantum protocols for secure blind decryption with two users preserve message and key secrecy, with the second also hiding the key index and remaining secure against post-protocol server collusion where the classical version fails.
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Security of deterministic key distribution with higher-dimensional systems
Higher-dimensional two-way QKD protocols using mutually unbiased bases and Heisenberg-Weyl operators yield secret keys for stronger individual attacks and improved robustness to collective eavesdropping via entropic uncertainty relations.