Securing Historian Server in OT Environment

When to Use

• When deploying a new historian server in an OT environment and configuring it securely from the start
• When hardening an existing historian after a security assessment identified it as a high-risk target
• When designing historian data replication architecture through a DMZ for IT access to process data
• When implementing access controls to prevent unauthorized modification of historical process data
• When investigating suspected historian compromise or data integrity issues

Do not use for IT-only database security without OT data (see general database hardening), for real-time SCADA data transmission security (see detecting-attacks-on-scada-systems), or for historian selection and sizing decisions.

Prerequisites

• Historian platform (OSIsoft PI, Honeywell PHD, GE Proficy, AVEVA Historian) installed and operational
• Network segmentation with historian placed in Level 3 (Site Operations) per Purdue Model
• Understanding of data flows: field devices -> PLCs -> OPC servers -> historian
• Access to historian administration credentials
• DMZ infrastructure for IT-facing data replication