Research Cryptographic Strength Systems of Quantum Cryptography with Phase Coding

Master's dissertation is devoted to the investigation of the cryptographic stability of systems of quantum cryptography with phase coding. Attention is drawn to the problems of practical implementation of quantum cryptography within Russia in relation to other countries. Questions related to quantum information theory are considered, which in turn influence the implementation of quantum cryptography, which has come up against a number of technological and methodological complexities, including the difficulties in quantum key distribution, quantum computation, the lack of completeness of quantum information theory, and others. In practical implementation, as a rule, rather weak laser pulses are used, which are conveniently described by coherent quantum states. And in itself, laser radiation always represents the Poisson distribution relative to the number of photons. Single photons are a vulnerability in terms of intercepting an enemy with a division by the number of photons (PNS-attack). The scientific significance of the master's dissertation is the possibility of implementing quantum cryptography, taking into account the emerging technological and methodological problems and taking into account the foreign approach.