What are 'function-based security requirements'?

Function-based security requirements pertain specifically to defining security measures that are tailored to the operational functions of an industrial automation and control system (IACS). This approach ensures that the security measures implemented are directly aligned with the particular tasks and functionalities the system is intended to perform.

By focusing on the actual operations of the system, function-based security requirements allow for a more effective identification of potential security risks within that context. This alignment promotes a proactive stance in mitigating vulnerabilities that are closely tied to functional operations, leading to a more resilient security posture tailored to the unique characteristics and needs of the system.

In contrast, the other options do not accurately capture the essence of function-based security requirements. Requirements focused on technology implementation might neglect the specific security needs arising from operational contexts. General security standards are typically broad and may not address the nuances of particular operational functions. Regulatory guidelines for financial systems are industry-specific and do not encompass the operational functions of IACS systems as a whole.