Zero Trust Security for Operational Technology Systems

This solution brief outlines the implementation of zero-trust security principles in operational technology (OT) and industrial control systems (ICS). It describes how traditional network security measures, which focus on perimeter defense, are insufficient in the face of modern cyber threats that can exploit vulnerabilities within the network. The document details the Purdue Enterprise Reference Architecture, which segregates OT from IT systems to protect critical infrastructure. It emphasizes the need for micro-segmentation to control data movement within the network, thereby reducing the attack surface and limiting the potential damage from malware or ransomware. The ColorTokens platform is presented as a solution that integrates network micro-segmentation with zero-trust user access controls, ensuring that only necessary traffic is allowed between micro-segments. This approach enhances security by preventing unauthorized lateral movement within the network, thereby safeguarding both IT and OT assets from cyber threats.