The Purdue Model in OT security

One of the biggest misconceptions in OT security is that the Purdue model can act, or even was intended, as a security architecture. Ralph explains why it can even be counter-productive and lead to LESS security.
#otsecurity #purduemodel
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[@millerdp]

Ralph, thank you for the enlightening and useful discussion. Much appreciated.

[@brianduffy8768]

Zoning and Conduit as per 62443, instead of purdue thinking. Zone the Control Systems for network Segmentation.

[@Atreus21]

I don't understand. What is the purpose if the zones then?

[@OTbase]

Zones have nothing to do with the Purdue model.

[@Atreus21]

​@OTbase sorry, not zones - layers. The layers from 1 to 4. What is the purpose of organizing it like that if all that really matters is network segregation? Sorry again, my questions are uninformed. I'm new to this stuff.