Key distribution 3 Key-distribution protocols Authentication 2 Binarization processing 2 Computational ghost imaging 2 Cryptographic key 2 Cryptographic key distribution 2 Identity authentication 2 Image processing 2 Interactive joint authentication 2 Internet protocols 2 Multi-party optical communication 2 Network security 2 Network-based 2 Optical communication 2 Public networks 2 Degrees of freedom (mechanics) 1 Efficiency 1 Key bits 1 Particle beams 1 Photons 1 Polarization 1 Polarization degree 1 Polarization modes 1 Private key 1 Quantum communication 1 Quantum efficiency 1 Semiquantum key distribution 1 Semiquantum key distribution (SQKD) 1 Single photon 1