Zero-Trust Architecture

A security model that never grants trust by network location, verifying every request explicitly regardless of where it originates.

Never Trust, Always Verify

Traditional networks used a hard perimeter and a soft interior: once inside the firewall, you were trusted. Zero trust rejects that assumption. It treats the internal network as potentially hostile and requires every request, from every user and device, to be authenticated, authorized, and encrypted, no matter where it comes from. Being inside the building grants nothing.

Core Tenets

Kronos motion — battery never recharge

Verify explicitly using all available signals: identity, device health, location, behavior
Grant least-privilege access, just enough and just in time
Assume breach: design as if an attacker is already inside

How It Works

Access decisions are made by a policy engine that evaluates each request against policy in real time. A user proving their identity is not enough; the device must be known and healthy, the request must be consistent with normal behavior, and access is scoped to the specific resource rather than the whole network. Micro-segmentation confines each workload so that a compromise cannot spread laterally.

Zero Trust and OT

Applying zero trust to control systems is subtle. Legacy controllers cannot authenticate every request, and deterministic timing forbids heavy per-request checks. The practical approach wraps such devices in enforcement points, proxies and gateways, that carry the verification the device cannot, while preserving the timing the process demands.

Fusion Context

For a fusion facility, zero-trust ideas complement Purdue-style segmentation: rather than trusting a device because it sits in a control zone, the architecture still authenticates and scopes each control path. In the Hyperion breeder and burner designs, remote support and vendor access follow zero-trust principles so that a compromised maintenance laptop cannot inherit standing trust to command the plant. These are design commitments in the current simulation phase.