Preface The International Research and Practice Conference “Information Technologies and Security” is annually held by Institute for Information Recording of National Academy of Sciences of Ukraine. The collection includes selected papers presented at the XIX International Scientific and Practical Conference "Information Technologies and Security" (ITS-2019, November 28, 2019, Kyiv, Ukraine). Selected conference papers cover such issues of Computer Science as critical infrastructure cyber-security, open source-based information and analytical research technologies, ontological approach, semantic networks, decision-making support, computer modeling of processes and systems, relevant problems of technological support of information and cybernetic security. The proceedings would be useful for specialists of information technologies, information security, as well as for Ph.D. students and senior-year students of higher educational establishments of respective profiles. Aleksandr Dodonov ITS-2019 Conference Editor Program committee of the conference: Aleksandr Dodonov, Dr.Eng., Professor, Institute for Information Recording of National Academy of Sciences of Ukraine, Ukraine Dmitry Lande, Dr.Eng., Institute for Information Recording of National Academy of Sciences of Ukraine, Ukraine Nikolai Stoianov, Ph.D., Associate Professor, Bulgarian Defence Institute “Professor Tsvetan Lazarov”, Bulgaria Vitaliy Tsyganok, Dr.Eng., Institute for Information Recording of National Academy of Sciences of Ukraine, Ukraine Andrei Snarskii, Dr.Phys.-Math.Sci., National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute", Ukraine Oleg Chertov, Dr.Eng., Professor, National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute", Ukraine