Snowden said nearly a decade ago that intelligence agencies have the ability to communicate with airgapped machines, meaning those that are isolated from any networks.
Oh, but viruses are, not just via open Internet. This is how the Siemens PLCs in the Iranian Uranium enrichment facility were controlled.
The most important thing is that you know the vulnerability of the PLCs (you built them ) and how to breach the perimeter (Israel supplies/codes much of the firewalls in US public infra).
Snowden said nearly a decade ago that intelligence agencies have the ability to communicate with airgapped machines, meaning those that are isolated from any networks.
Oh, but viruses are, not just via open Internet. This is how the Siemens PLCs in the Iranian Uranium enrichment facility were controlled.
The most important thing is that you know the vulnerability of the PLCs (you built them ) and how to breach the perimeter (Israel supplies/codes much of the firewalls in US public infra).
Stuxxnet was a virus that targeted Siemens PLCs. It was specifically seeking Iranian centrifuge applications and it found them.
Cyber polygon