How identity, attestation, and provisioning flow from silicon to cloud — and where the boundaries are.
Each stage carries an explicit, verifiable assertion. No layer asks the next layer to "just trust me".
Immutable hardware base.
Identity, key custody, attestation logic.
Secure boot, signed updates, OS layer.
Sandbox or production-ready connectivity.
Identity-aware services, audit, lifecycle.
Embedded PKI is not "PKI on a smaller machine" — it is PKI under different assumptions. Devices do not always have a clock. Memory is constrained. Connectivity is intermittent. Revocation has to work without phoning home for every check. AmbiSecure designs hierarchies that respect those constraints while still producing assertions a back-end can trust.
Attestation lets a relying party form an opinion about a device beyond "it knows a key". With attestation, a device can demonstrate that its firmware matches an expected version, that a specific applet is loaded inside its Secure Element, or that a credential has been provisioned under controlled conditions. We design attestation flows that produce statements an operator or enterprise back-end can actually act on.
Identity isn't a one-time event — it's a sequence of states that have to compose cleanly.
Initial keys provisioned in controlled environment.
Device-specific identity finalized.
Authentication, attestation, OTA updates.
Operator change, ownership transfer.
Identity retirement, key revocation.
Field updates are the most common moment a trust model gets compromised. Architecture has to assume they will happen, frequently, under imperfect conditions.
Verifiable boot path that gates execution on signed code.
OTA payloads signed under a hierarchy whose root lives outside the device.
Anti-rollback mechanisms enforced inside the Secure Element.
A failed update should not silently demote the device's trust status.
Post-update attestation reconfirms device state to the back-end.
Update events are visible to lifecycle systems.
We can share design notes, threat model, and review the attestation flow with a security team.