Built In, Not Bolted On: IEC 62443-4-1 Secure Product Development Lifecycle

Deep End Era. Engineering with Sankalp · Oct 28, 2026 · 1h 4m

Khalid Mansour, an Al Sahil instrument engineer seconded to the controller vendor's development centre for six months, follows a single firmware feature from requirement to release. Priya Raman, the vendor's product security officer, shows him threat models, code reviews, fuzzing rigs, the defect board and the advisory that went out at 2 a.m. Part eleven of The Deep End's 62443 series.

Chapters

00:00:00 Cold open: the feature request

00:03:35 What 4-1 is and is not

00:09:18 Practice one: security management

00:18:15 Practice two: specification of security requirements

00:23:45 Practice three…