The Perimeter Fallacy
Classic network security used the castle-and-moat model: once a device was inside the private local network (VPN, office), it was trusted by default. Zero-Trust removes this boundary, treating every network as hostile and requiring explicit authentication for every request.
Core Pillars of Zero-Trust
- Continuous Verification: Always authenticate and authorize based on user identity, device health, geolocation, and request context.
- Least Privilege: Restrict user and service permissions to only the resources they require right now, using temporary role assumptions.
- Assume Breach: Structure networks into isolated micro-segments, monitor all traffic, and encrypt data at rest and in transit.