Zero Trust

Classic security was a castle and moat: a hard perimeter (firewall, VPN) with a soft, trusting interior. Once you were inside the network, you were largely trusted. Attackers learned to exploit exactly that - phish one user, land inside the perimeter, and move freely. Zero Trust assumes the attacker is already inside and removes the implicit trust.

Every access request is authenticated, authorized, and encrypted based on context signals, not on where the request came from. The decision is made by a Policy Decision Point (PDP) and enforced by a Policy Enforcement Point (PEP) that sits in front of the resource. Two more principles round it out: least privilege and assume breach - design as though an attacker already has a foothold.

Stolen credentials alone stop working. In the IRON CHIMNEY scenario, marcus.chen's password was phished. Under a perimeter model that is often enough. Under Zero Trust, the login from an unmanaged device in an unusual location trips device and context checks and gets stepped-up or denied - the password is necessary but no longer sufficient.

Lateral movement gets contained. Micro-segmentation and per-app brokering mean a compromised workstation cannot freely reach the domain controller, Exchange, and CI/CD. Each hop is a fresh, verified access decision rather than an open internal network.

It is a journey, not a product. No vendor sells "Zero Trust in a box." It is an architecture built from identity, device management, segmentation, and analytics you likely already own - applied with the discipline of verifying every request.