Audit Evaluation Metrics and Readiness Gap Analysis
Evaluating an industrial facility for zero-trust architecture adoption requires a structured diagnostic audit protocol rather than an immediate architectural overhaul across operational technology environments. Industrial control systems govern sensitive physical processes where unexpected communication latency or abrupt credential enforcement poses severe risks to operational continuity. Consequently, the practical implementation design establishes a zero-trust readiness audit framework evaluated across four core diagnostic criteria: identity-centric access control, network microsegmentation feasibility, legacy system integration capacity, and continuous behavioral monitoring capability. As established in cybersecurity scholarship, transitioning to a zero-trust architecture demands strategic planning and structured readiness assessment because legacy infrastructure integration and organizational skill shortages present critical adoption barriers across enterprise settings (crossref-10-2139-ssrn-6962724, 2026). Systematically scoring these practical dimensions enables engineering teams to evaluate baseline vulnerabilities and lateral movement risks before deploying restrictive policy enforcement mechanisms. Furthermore, critical infrastructure protection requires a multi-layered defense strategy combined with continuous monitoring and real-time incident response to safeguard industrial automation and control systems against evolving cyber threats (crossref-10-36948-ijfmr-2020-v02i05-36369, 2020). The practical application of this audit framework prioritizes continuous verification while preserving plant availability through a phased implementation roadmap. By applying these diagnostic criteria, cybersecurity practitioners identify specific firmware limitations, protocol vulnerabilities, and authentication gaps across supervisory control layers without disrupting industrial productivity. This diagnostic procedure establishes the necessary technical baseline for executing phased access controls and resilient mitigation strategies.