The article examines the evolution of the concept of Integrated Information Security Systems (IISS) in the context of the digital transformation of the public sector, modernization of the national cybersecurity framework, and harmonization of Ukrainian legislation with international information security standards. The study reveals the relationship between classical approaches to building IISS – based on mandatory certification of technical protection complexes – and the modern paradigm of risk-oriented security management introduced by the new Law of Ukraine No. 4336-IX “On Amendments to Certain Laws of Ukraine on the Protection of Information and Cybersecurity of State Information Resources and Critical Information Infrastructure Objects.” The research emphasizes the shift from a formal certification model to a process-oriented approach based on security profiles, risk management, continuous monitoring, and security auditing. Special attention is devoted to analyzing the potential of blockchain technologies in enhancing the resilience of state information systems against cyberattacks, insider threats, and unauthorized data modifications. The study substantiates the feasibility o
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