Operational Technology (OT)
Fortifying Industrial Control Systems with the Purdue Model
What Is OT Security?
Operational Technology (OT) security encompasses the strategies and measures implemented to protect systems that are crucial for the monitoring and control of physical devices and processes in industrial environments. As industrial systems increasingly merge with Information Technology (IT) to drive automation and efficiency, robust OT security becomes vital for safeguarding critical infrastructure against evolving cybersecurity threats.
The Purdue Model Explained
The Purdue Model for Industrial Control Systems is a recognized framework that organizes ICS architecture into hierarchical levels. This structured approach is designed to enhance security and manageability by clearly defining areas where security controls should be focused.
Key Differences Between IT and OT Security
Focus and Priorities : IT security typically prioritizes confidentiality and data integrity to protect information assets. In contrast, OT security focuses on the availability and reliability of systems that control physical processes..
Environment and Systems : OT environments often involve legacy systems with long lifecycles and are not regularly updated, unlike IT systems, which can be updated more frequently and are often designed with security in mind.
Response to Threats : The approach to mitigating threats differs; in IT, the response can afford temporary shutdowns or restrictions for security updates, whereas in OT, continuous system availability is crucial, often requiring that systems remain operational even during patching and updates.
Operational Technology Security Best Practices
Network Segmentation and Isolation : Critical to preventing the spread of breaches from IT environments to more sensitive OT areas.
Robust Access Controls : Essential for ensuring that only authorized personnel have access to control systems, minimizing the risk of internal threats.
Real-time Monitoring and Detection : Implementing advanced monitoring tools that can detect and alert on abnormal activities indicative of potential security threats.
Regular Vulnerability Assessments : Conducting assessments and applying patches in a controlled manner to minimize impact on operational continuity.
