historian▌

This skill covers hardening and securing process historian servers (OSIsoft PI, Honeywell PHD, GE Proficy, AVEVA Historian) in OT environments. It addresses network placement across Purdue levels, access control for historian interfaces, data replication through DMZ using data diodes or PI-to-PI connectors, SQL injection prevention in historian queries, and integrity protection of process data used for safety analysis, regulatory reporting, and process optimization.

Detect cyber attacks targeting OT historian servers (OSIsoft PI, Ignition, Wonderware) that sit at the IT/OT boundary and serve as pivot points for lateral movement between enterprise and control networks, including data manipulation, unauthorized queries, and exploitation of historian-specific vulnerabilities.

Analyze events through the disciplinary lens of history, applying rigorous historical methods (source criticism, comparative analysis, periodization), temporal frameworks (continuity/change, causation), and historiographical perspectives to understand how the past shapes the present, identify historical patterns and precedents, and contextualize contemporary events within long-term trajectories.