TY JOUR TI SYSTEMATIC APPROACH TO THE COMPOSITION OF CONTROL FUNCTIONS IN THE INFORMATION SECURITY SYSTEMS KW information security KW system approach KW information protection management functions KW diagram of possible outcomes KW life cycle of a threat JO Vestnik of Astrakhan State Technical University. Series: Management, computer science and informatics AU Popov, G.. AU Popova, E.. PY 2018 IS PB Astrakhan State Technical University