Zhmurko T. Methods for improving the efficiency of quantum cryptography protocols

Thesis is devoted to applied scientific research task to develop and study new, more efficient methods for ensuring sustainability of quantum cryptography qutrit protocols to non-coherent attacks; constructing trit generator of pseudorandom sequences and evaluation of its quality (possibility of using them in cryptographic applications). The results obtained in the thesis can be used to improve efficiency (security level and speed) of security systems based on quantum direct secure communication and quantum key distribution, and can be used for security procedures in traditional (non-quantum) cryptographic information security systems. In this work developed classification of quantum cryptography methods, which can expand opportunities for choosing appropriate methods to construct modern quantum information security systems (based on quantum direct secure communication and other quantum technologies). Was further developed a method for ensuring stability of quantum cryptography qutrit protocols, which allows to minimize the amount of switching between protocol modes (message transmission and eavesdropping control), and increase speed by a factor of 4.4, while maintaining the resistance to non-coherent attacks. Also, was further developed a method of generating pseudorandom sequences, which allows to create ternary unbalanced pseudorandom sequences. In addition, further developed a method for evaluating pseudorandom sequence quality, which enables to evaluate the statistical parameters and laws of ternary pseudorandom sequences.