This book presents contributions from the 21st DepCoS RELCOMEX Conference that addresses the reliability, safety, security, and performance of modern information systems—domains that are rapidly evolving under the influence of artificial intelligence, quantum technologies, and emerging cybersecurity challenges. Readers will find insights into cutting edge analytical tools, innovative architectures, and real world applications that shape the future of dependable computer systems and networks. Spanning theoretical advances, engineering methodologies, and practical case studies, the proceedings reflect the inherently multidisciplinary nature of contemporary system design.
The scope of the DepCoS conferences has always encompassed the diverse challenges that arise in the performability and dependability analysis of modern computer systems. This year, the topical range has been further enriched by a strong set of contributions on quantum computing—a rapidly developing paradigm with the potential to transform the way computers will be used in the future. It has also become increasingly clear that artificial intelligence methods and tools play a central role in today’s information technology and computer engineering and that cybersecurity—both its tools and its standards—is gaining critical importance, particularly in light of the rapidly growing threats posed by AI driven attack systems.

Wojciech Zamojski has been a professor of computer engineering at the Wroclaw University of Science and Technology (WUST) and at the University of Zielona Góra, the Collegium Witelona in Legnica, and the DSW Ideis University of Lower Silesia in Wrocław. His research focuses on the theory of system dependability, computer systems and networks, artificial intelligence, and modeling of transport systems. He is the founder of an academic school of dependability of computer systems. Apart from DepCoS Conferences, he was the main organizer of cyclic conferences RELCOMEX and MICROCOMPUTER Schools. He is the (co)author and editor of scientific publications (articles, books, notebooks, reports, proceedings) related to computer engineering and dependability.

Jacek Mazurkiewicz is an associate professor at Faculty of Information and Communication Technology at WUST, Poland. He is a member of Polish Neural Network Society and Polish Safety and Reliability Association and the (co)author of over 180 papers in international journals, book chapters, and proceedings. His fields of interest include soft computing, computer architecture, wireless systems, dependability, functional analysis, and modeling of systems.

Jarosław Sugier is an assistant professor at the Faculty of Information and Communication Technology at WUST. His research interests include programmable digital circuits, hardware implementation of cryptographic algorithms, and modeling of human behavior in computer simulators. He is an author or co-author of about 90 scientific publications and has been an editor of 20 monographs and conference proceedings.

Tomasz Walkowiak is a scientist working in the field of machine learning. He is one of the leading designers of the concept and architecture of the CLARIN-PL Language Technology Centre, which is built upon parallel, distributed, and efficient text processing. He consistently serves as a member of program committees and as a reviewer for machine learning and NLP-related international journals and scientific conferences. Additionally, he is an editor of 10 monographs and has (co)authored over 240 papers.

Janusz Kacprzyk is a professor of computer science at the Systems Research Institute of Polish Academy of Sciences and also at The Warsaw School of Information Technology, PIAP—Industrial Institute of Automation and Measurements, and Cracow University of Technology. He has been a visiting professor at universities in USA, England, Italy, UK, and Mexico. He is a full member of the Polish Academy of Sciences, a fellow of IEEE and IFSA, and a foreign member of the Spanish Royal Academy of Economic and Financial Sciences. His research interests include intelligent systems, soft computing, fuzzy logic, decision-making, decision analysis and decision support, database querying, information retrieval, data analysis, data mining, etc. He has (co)authored 5 books, 50 volumes, and ca. 400 papers.