V. P. Dobritsa - Dr.Sc. (Phys.-Math.), Professor, Chair of the information Security and Communications Network, South-West State University, Kursk, Russia. E-mail: dobritsa@mail.ru
S. S. Volokitin - Post-graduate Student, Chair of the Information Security and Communications Network, South-West State University, Kursk, Russia. E-mail: volokitinss@gmail.com