Cybersecurity risk assessment methodologies

There are several methodologies available for carrying out risk assessments for ICSs, each with its own strengths and weaknesses. In this section, we will focus only on methodologies and standards that are SIS-related.

Starting with IEC 62443, this stands as an international standard for IACS security. It provides a flexible framework to address and mitigate current and future security vulnerabilities in ICSs. Its strength lies in its comprehensive approach to ICS security, covering aspects of policy, system design, and procedural controls. However, a detailed risk assessment in line with IEC 62443 can be complex and resource-intensive due to its broad scope and depth.

The National Institute of Standards and Technology (NIST) Special Publication (SP) 800-82 standard provides guidance specifically tailored to ICSs. It is comprehensive and provides strong procedures for addressing the ICS lifecycle, but implementation can often be complex...