Self-assessment·~2 min
OT Security Quick Score
A free 10-question self-check for the people who actually run control systems. Answer honestly about your site and get a red / amber / green signal with a prioritised fix-first list — mapped to NCSC CAF and IEC 62443.
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Getting started·8 min read
Controls Engineer's Guide to OT Cybersecurity
You already understand risk. This guide maps functional safety concepts — HAZOP, SIL, IEC 61511 — directly to OT cybersecurity, so controls engineers can apply what they already know.
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Vulnerability management·7 min read
How to Read an NVD CVE Report (and Find the Real Fix)
NVD pages are dense — a CVSS score, a description, and a wall of reference links with no obvious next step. What each part actually tells you, which reference link has the fix, and a real worked example.
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Standards·10 min read
IEC 62443 Explained: The Industrial Cybersecurity Standard
A plain-English guide to IEC 62443. What the standard covers, how its parts fit together, Security Levels, zones and conduits — and where to start.
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Network security·12 min readFree account
OT Network Segmentation: Zones, Conduits & the Purdue Model
How to apply the Purdue model and IEC 62443 zones and conduits to reduce attack surface in a real industrial network. Includes common mistakes and practical steps.
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Functional safety·10 min readPro
SIL Verification Explained: PFDavg, Proof Tests & Documentation
The three barriers every SIF must clear under IEC 61511 — PFDavg, architectural constraints, and systematic capability — plus the pitfalls that most often invalidate the calculation.
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Protocols·8 min readPro
OPC UA Security Configuration: A Step-by-Step Guide
Security modes and policies, application certificates and trust lists, user authentication — and the misconfigurations that quietly undo all of it in production.
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Protocols·7 min read
Modbus Security: Understanding the Risks and Mitigations
Modbus has no authentication, encryption, or integrity protection. The real attack vectors, and the practical mitigations available without replacing a single device.
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Standards·9 min readFree account
NIST CSF 2.0 for OT: What Changed and What It Means
The new Govern function, expanded supply chain guidance, and broadened scope — what CSF 2.0 means for industrial environments and how to use it alongside IEC 62443.
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