Cryptographic key distribution method and apparatus thereof

摘要: A cryptographic key distribution method, in which coherent light being suitable for optical fiber communication network is used and high security secured, provided. sending end encodes random numbers so that symmetry probability distributions can be obtained at a receiving end, also sets intensity modulation index of signal radiating from the SNR an eavesdropper less than 2 dB even when said uses most equipment more −10 dB, transmits signals. The calculates signals discrimination threshold value after set was transmitted end. When have some abnormal states, it judged exists, distributing stopped fresh distributed again.