Preface
       The International Research and Practice Conference “Information
Technologies and Security” is an academic event, annually held by the Institute
for Information Recording of the National Academy of Sciences of Ukraine.
Although the Conference is headquartered in Ukraine, its geographical scope is
expanding with every new edition of the event. Participants (editors, organizing
committee members, and paper authors) come from around the globe. Paper
publication standards and requirements to authors are growing higher, while
review process is becoming more rigorous with every coming year.
       The collection includes selected papers, presented at the XXI
"Information Technologies and Security" Conference (ITS-2021, December 9,
2021, Kyiv, Ukraine).
       Out of approximately 50 initial submissions 23 best papers have been
selected for publication in the proceedings volume. Selected papers cover the
latest advances in such areas of Computer Science as
   Big Data Technologies;
   Information and Cybernetic Security;
   Security and Survivability of Critical Infrastructures;
   Modelling and Analysis of Computer-mediated Communication Processes;
   Analytical Systems Based on Open Source Intelligence (OSINT);
   Complex Systems Modelling;
   Decision Support Systems.
       Hopefully, the present proceedings volume will provide a valuable
contribution to fundamental and applied knowledge in the field of Computer
Science and the listed areas.

                                   ITS-2021 Conference Program Committee:
Aleksandr Dodonov, Dr.Eng., Professor, Institute for Information Recording of
 National Academy of Sciences of Ukraine, Ukraine
Dmitry Lande, Dr.Eng., Professor, 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
Sándor Bozóki, Ph.D., Computer and Automation Research Institute Hungarian
 Academy of Sciences, Budapest, Hungary
Stan Lipovetsky, Ph.D., GfK Custom Research North America, Minneapolis,
 MN, USA
Andrei Snarskii, Dr.Phys.-Math.Sci., Professor, National Technical University
 of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute", Ukraine
Andriy Olenko, Ph.D., Associate Professor, La Trobe University, Melbourne,
 Australia
Oleg Chertov, Dr.Eng., Professor, National Technical University of Ukraine
 "Igor Sikorsky Kyiv Polytechnic Institute", Ukraine