OT Cybersecurity: Is the Purdue Model Still Useful?

OT Cybersecurity: Is the Purdue Model Still Useful?

by Industrial Cybersecurity Insider

Applied Sciences & Engineering Computing & Cybersecurity UTComputer networking and communicationsUTNNetwork security
🎙 Industrial Cybersecurity Insider 👥 192 📅 May 12, 2026 ⏱ 48 min 👁 33 📄 expert opinion 🧭 2026-08-16
Available in: English (current) Français

Keywords

Purdue ModelOT securityIT/OT convergenceasset inventorynetwork segmentation

Summary

In this episode, Dino and Ken Kully, a delivery readiness expert at Rockwell Automation, discuss the ongoing relevance of the Purdue Model in industrial cybersecurity. They argue that while the model is aging, it remains a useful framework for network segmentation, especially in environments with flat networks. The conversation highlights that IT/OT convergence is primarily a people and process challenge, not a technology one, citing examples like shared operator accounts, MFA resistance, and the ‘silver tsunami’ of retiring experts. They emphasize the importance of accurate asset inventory as the foundation for any security program, and discuss the difficulties of standardizing security across multiple plants with diverse legacy systems. The episode also touches on vendor access, the need for documentation, and the role of system integrators in sustainable OT security. Overall, they conclude that the Purdue Model, while not perfect, is still a valuable map for understanding and securing industrial networks.

150 words

Critical Evaluation

Value of the Information & Strength of the Argument

The value of the information lies in its practical, ground-level perspective from a seasoned OT security professional. The argumentation is solid, built on real-world examples and a clear logical flow: the Purdue Model is a useful map, but its implementation must be flexible; IT/OT convergence is hindered by cultural and operational gaps, not technology; and asset inventory is the critical first step. The discussion is nuanced, acknowledging both the strengths and limitations of the model, and avoids oversimplification.

Scientific Rigor, Source Quality, Title Accuracy

The scientific rigor is moderate; the conversation is based on anecdotal evidence and professional experience rather than formal research. No specific standards or publications are cited, though the CPwE architecture is mentioned. The title accurately reflects the content, which directly addresses the question of the Purdue Model’s usefulness. The discussion is well-structured and stays on topic.

149 words

Title / Content Match

The title accurately reflects the central debate, which is thoroughly explored from multiple angles.

Quality & Reliability

7/10

The discussion is grounded in extensive practitioner experience, but lacks formal citations or references to standards, making it largely anecdotal.

Key Moments

Markers derived by PSI from the transcript: the creator did not define chapters.

Cited Sources

Concurring Sources

Contribution & Novelties

The episode provides a candid, practitioner-level view on the Purdue Model’s relevance, emphasizing the human and operational challenges often overlooked in technical discussions. It offers practical insights into asset inventory, segmentation, and IT/OT collaboration.

Pour aller plus loin :

  • Purdue Enterprise Reference Architecture — Background on the model’s origins and structure.
  • IEC 62443 — International standards for industrial cybersecurity, relevant to segmentation and security levels.
  • ISA-95 — Standard for integrating enterprise and control systems, related to IT/OT convergence.
  • NIST SP 800-82 — Guide to Industrial Control Systems (ICS) security, including network architecture recommendations.

93 words

Radar Profile

The radar profile shows high scores in quantity of information and technical level, reflecting the depth of practical knowledge shared. The lower scores in quality and reliability indicate the lack of formal citations and reliance on anecdotal evidence.

Reliability 6/10

💬 No comments were provided for analysis.