What is a security level in the context of ISA/IEC 62443?

In the context of ISA/IEC 62443, a security level is defined as the required level of protection against unauthorized access or attacks. This framework is designed to establish a standard for securing Industrial Automation and Control Systems (IACS). Security levels provide a measurable way to specify the degree of security necessary to mitigate risks associated with cyber threats.

Security levels within the ISA/IEC 62443 framework are categorized from Level 1 to Level 4, each representing increasing degrees of protection and resilience against cyber threats. Level 1 typically corresponds to basic security measures, while Level 4 indicates the highest level of security, requiring stringent safeguards and comprehensive measures against potential breaches.

Understanding this concept is crucial for professionals in the field, as it guides the implementation of appropriate security measures tailored to the specific risks and requirements of an organization or system.