V.B. Baiburin - Dr. Sc. (Phys.-Math.), Professor, Department «Information security of automated systems», Yuri Gagarin State Technical University of Saratov. E-mail: baiburinvb@rambler.ru A.A. Terentyev - Dr. Sc. (Eng.), Professor, Department «Information security of automated systems», Yuri Gagarin State Technical University of Saratov. E-mail: a_a_terentyev@mail.ru A.S. Rozov - Post-graduate Student, Department «Information security of automated systems», Yuri Gagarin State Technical University of Saratov. E-mail: fog545@mail.ru