๐๐ซ๐ข๐ง๐ ๐ข๐ง๐ ๐๐๐ซ๐จ ๐๐ซ๐ฎ๐ฌ๐ญ ๐ญ๐จ ๐๐๐/๐๐ ๐๐ง๐ฏ๐ข๐ซ๐จ๐ง๐ฆ๐๐ง๐ญ๐ฌ: ๐๐ก๐ ๐๐จ๐ฅ๐ ๐จ๐ ๐ญ๐ก๐ ๐๐ฎ๐ซ๐๐ฎ๐ ๐๐จ๐๐๐ฅ & ๐๐๐ฐ๐ ๐ข๐ง ๐๐๐/๐๐ ๐ฌ๐๐ ๐ฆ๐๐ง๐ญ๐๐ญ๐ข๐จ๐ง.
๐ด๐๐๐๐ก๐๐๐ ๐๐๐๐ ๐๐๐ข๐ ๐ก ๐๐ ๐ผ๐ถ๐ & ๐๐ ๐๐๐ฃ๐๐๐๐๐๐๐๐ก๐ ๐๐๐๐ข๐๐๐๐ ๐กโ๐ ๐๐๐โ๐ก ๐๐๐๐๐๐ค๐๐๐. ๐ท๐๐ ๐๐๐ฃ๐๐ โ๐๐ค ๐กโ๐ ๐๐ข๐๐๐ข๐ ๐๐๐๐๐ ๐๐๐ ๐ถ๐๐ค๐ธ ๐๐๐ ๐๐ข๐๐๐ ๐ฆ๐๐ข๐ ๐ ๐๐๐ข๐๐๐ก๐ฆ ๐ ๐ก๐๐๐ก๐๐๐ฆ.
Threats against Industrial Control Systems (ICS) and Operational Technology (OT) are increasingly sophisticated, posing risks to critical infrastructure. Unlike traditional IT, a breach in OT can lead to severe failures. The Zero Trust framework has become important for securing industrial networks, requiring a customized approach that addresses the specific constraints of these environments. This includes maintaining secure, operational continuity and clear segmentation between IT and OT systems, with the Purdue Model and Converged Plantwide Ethernet (CPwE) as key security components.
๐๐จ๐ฐ ๐ญ๐ก๐ ๐๐ฎ๐ซ๐๐ฎ๐ ๐๐จ๐๐๐ฅ ๐๐ฎ๐ฉ๐ฉ๐จ๐ซ๐ญ๐ฌ ๐๐๐ซ๐จ ๐๐ซ๐ฎ๐ฌ๐ญ ๐ข๐ง ๐๐๐/๐๐
The Purdue Model for ICS Security offers a systematic framework for segmentation, distinguishing between enterprise IT and industrial control systems. Below is an overview of how the Zero Trust framework aligns with this architectural structure:
๐๐๐ฏ๐๐ฅ ๐ & ๐ ๐๐ง๐ญ๐๐ซ๐ฉ๐ซ๐ข๐ฌ๐ ๐๐ & ๐๐ฎ๐ฌ๐ข๐ง๐๐ฌ๐ฌ ๐๐ฒ๐ฌ๐ญ๐๐ฆ๐ฌ: Implement zero trust access controls for IT personnel accessing OT systems. Additionally, establish network segmentation between IT and OT environments to reduce the risk of lateral movement of threats.
๐๐๐ฏ๐๐ฅ ๐ ๐๐ฉ๐๐ซ๐๐ญ๐ข๐จ๐ง๐ฌ & ๐๐จ๐ง๐ญ๐ซ๐จ๐ฅ: Implement micro-segmentation to isolate SCADA systems, HMIs, and control servers. Additionally, employ role based access controls (RBAC) for engineers and operators to enhance security.
๐๐๐ฏ๐๐ฅ ๐ ๐๐ฎ๐ฉ๐๐ซ๐ฏ๐ข๐ฌ๐จ๐ซ๐ฒ ๐๐จ๐ง๐ญ๐ซ๐จ๐ฅ & ๐๐๐๐๐ญ๐ฒ ๐๐ฒ๐ฌ๐ญ๐๐ฆ๐ฌ:Remote access requests require authentication before interacting with PLCs and secure controllers. Anomaly detection systems should be implemented to monitor unauthorized commands or changes.
๐๐๐ฏ๐๐ฅ ๐ & ๐ ๐๐จ๐ง๐ญ๐ซ๐จ๐ฅ๐ฅ๐๐ซ๐ฌ, ๐๐๐ง๐ฌ๐จ๐ซ๐ฌ, ๐๐ง๐ ๐ ๐ข๐๐ฅ๐ ๐๐๐ฏ๐ข๐๐๐ฌ: Implement whitelisting to limit communication to authorized devices. Additionally, employ read only policies for sensitive control data to safeguard against tampering.
Implementing Zero Trust principles in ICS and OT is important for protecting critical operations and preventing failures. The Purdue Model and Converged Plantwide Ethernet (CPwE) framework help in securing and segmenting industrial networks, facilitating Zero Trust security. The future of industrial cybersecurity depends on adapting these principles to OT environments while maintaining operational integrity.