IEC 62443

IEC 62443 is the international standard series for security of industrial automation and control systems (IACS), developed by IEC TC65 with ISA. It is structured in four parts: general concepts, policies and procedures, system-level requirements with the foundational requirements and security levels SL 1-4, and component-level requirements for product suppliers. Maritime class societies adopt it as the operational-technology security baseline; IACS UR E26 and E27 draw their technical controls from IEC 62443, applying them to onboard computer-based systems on ships contracted for construction on or after 1 July 2024.