The Trust Boundary

Chip security is not only an IP-design problem. A trustworthy design still passes through wafers, masks, process recipes, implants or deposition steps, etches, metrology, packaging, test, and logistics before it becomes a physical device.

Every step is part of the dependency graph. If the manufacturing path is opaque, the user is still trusting a process they cannot reproduce or inspect, even when the HDL, layout, or firmware is open.

What Production Capability Means

Independent production does not only mean owning a final packaging line. It means knowing the material source, process window, tool calibration, defect modes, inspection method, lot history, and destructive-sampling path well enough to compare what was designed with what was built.

That is why physical capability matters. Trust moves from declarations toward measured process control.

Useful Scope

This note does not claim every trusted system needs a leading-edge fab. It names the deeper constraint: the root of trust eventually reaches the active-device process. The more that process can be repeated and measured locally, the less the whole machine depends on remote belief.