OT security · Engineering · Released October 2026

Don't Touch the Interlock by Kai London

Engineers make most of the decisions that determine whether an industrial system is secure, often without being told. This book translates cybersecurity into engineering terms — design, commissioning, maintenance and change — so security becomes part of how the plant is built and run.

What the book covers

Why OT is a target

The attacks that affect safety, production and equipment.

Secure design

Architecture, segmentation and hardening in engineering terms.

Controllers and HMIs

Securing PLCs, engineering workstations and remote access.

Change and maintenance

Patching, backups and change control without risking uptime.

Safety and security

How cyber risk interacts with safety systems and hazard analysis.

Working with IT security

A shared language for engineers and security teams.

This book offers general guidance and is not legal advice. It is independent and carries no endorsement by or affiliation with any regulator or standards body.

OT securityICSIEC 62443Engineering

Who it is for

Control, automation, electrical and process engineers, system integrators and engineering managers.

About the author

Professor Kai London — CISSP, CISM.

An internationally recognised cybersecurity executive, board advisor and Founder & CEO of Quantum AI Systems Security LLC, writing at the convergence of AI, governance and operational resilience. Honorary Professor and Researcher at UCL.