NIST SP 800-82 is a U.S. guidance document for securing industrial control systems and operational technology (OT). It explains how to protect environments such as factories, utilities, pipelines, and transit systems, where computers interact with physical processes.
The guidance matters because OT security is different from ordinary IT security: availability, safety, and predictable operation are often more important than aggressive scanning or rapid change. NIST SP 800-82 helps defenders build safer practices such as asset inventory, network segmentation, access control, logging, backup planning, and careful patch management. In real attacks, these controls can limit an intruder’s ability to move through a plant network or disrupt critical equipment. In defense programs, the document is often used as a baseline for risk assessments, architecture reviews, and security policies that respect production constraints.