This is already a thing, checkout Zero Trust Networks: https://en.wikipedia.org/wiki/Zero_trust_networks https://en.wikipedia.org/wiki/Zero_trust_networks these

This is already a thing, checkout Zero Trust Networks: https://en.wikipedia.org/wiki/Zero_trust_networks https://en.wikipedia.org/wiki/Zero_trust_networks these systems kind of operate on the premise the network is compromised to being with so what do you do then?