Cloud Security Zero · Trust is a decisionNothing
to find.

Cloud Security Zero helps enterprises take their applications off the internet's map. We design Zero Trust architecture for users, cloud, OT and AI agents, so attackers have no open door to scan.

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Three ideas behind every engagement

Go dark

If an application can be reached, it can be attacked. Connect people to applications, never to networks, and keep everything else invisible.

Black Cloud, 2017

Trust is a decision, not a default

Every person, device, workload and AI agent earns access on each request, based on who it is and what it is doing.

The dark arts of exploiting trust

Simplicity is security

Each extra appliance is another way to fail. Good architecture removes components instead of stacking more on top.

Simplicity: complexity resolved

How we help

Zero Trust strategy and architecture: Hands-on guidance for organisations replacing VPNs and perimeter firewalls, or maturing a Zero Trust programme that has stalled. Users, cloud workloads and operational technology.
Board and executive advisory: Clear input for boards and CISOs on security architecture, transformation risk and where to spend next, without the vendor noise.
AI and agentic security governance: The next untrusted actor is the AI agent. We help you decide what agents may touch, how they prove who they are, and how to stop them at machine speed.
Keynotes and workshops: Talks and working sessions for security teams, leadership groups and conferences across EMEA.

Founded by Tony Fergusson

Tony was among the first to run Zero Trust Network Access in production, and led the secure cloud transformation at Everllence that became a benchmark for Zero Trust architecture. He has spent 30 years in networking, security and IT leadership.

Cloud Security Zero began in 2016 as his blog on Zero Trust and going dark. The blog archive lives here; his newer articles and talks are on his personal site.

Visit tonyfergusson.com