What can a security zone be categorized as?

A security zone can be categorized as either trusted or untrusted based on the level of security measures implemented within that zone and the security posture required for the systems and networks operating in it. In the context of ISA/IEC 62443, a security zone is a collection of assets that share a common security requirement or risk profile, which allows for effective implementation of security controls tailored to their needs.

Trusted zones typically contain systems and devices that are considered secure and reliable, often protected by stringent security measures such as firewalls, intrusion detection systems, and secure communication protocols. Untrusted zones, on the other hand, may include external networks or systems with a higher risk factor, necessitating additional security controls to mitigate potential threats.

By categorizing security zones as capable of being either trusted or untrusted, organizations can adequately plan and implement security measures tailored to the specific risks and requirements of each zone. This nuanced understanding allows for more effective security management and incident response within the overall cybersecurity strategy.