Quantum Cryptography

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4 domain-specific abstractions whose origin domain is Quantum Cryptography.

• B92 protocol — A two-state quantum key-distribution protocol whose security relies on the impossibility of perfectly distinguishing nonorthogonal quantum states without disturbance.
• Quantum digital signature — A signature protocol using quantum-state distribution and measurement properties to provide message authentication, transferability and resistance to repudiation or forgery.
• Quantum key distribution — A cryptographic key-establishment method that encodes and measures quantum states so eavesdropping creates detectable disturbance, followed by authenticated classical reconciliation and privacy amplification.
• Six-state protocol — Distribute quantum-key bits by randomly preparing and measuring qubits in three mutually unbiased bases, then sift, estimate errors, reconcile, and privacy-amplify the retained data.