A Guy Who Wrote the Code Died in 2005. I Still Have to Secure It

The author—an experienced practitioner—argues that many critical infrastructure and manufacturing systems run on legacy, unpatchable OT and PLC hardware, forcing operators to source replacement parts from secondary markets like eBay. Because these systems cannot run modern security agents or be safely scanned, defenders must rely on strict hardware-based segmentation (“digital concrete”), passive network monitoring, and strengthened physical security to mitigate risks and keep essential services running.