In the IEC 62443 standard, Security Level (SL) 4 is the highest level of security and is designed to address threats from sophisticated attackers, such as hacktivists, terrorists, or nation-state actors. These attackers are characterized by their advanced resources, motivation, and persistence.
Security Levels in IEC 62443:
SL 1: Protection against casual or coincidental violation.
SL 2: Protection against intentional violation by low-skilled attackers with simple tools.
SL 3: Protection against intentional violation by skilled attackers with moderate resources.
SL 4: Protection against intentional violation by advanced attackers, such as hacktivists, terrorists, or nation-state actors, using sophisticated tools and techniques.
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