Desktop bridge for local qualified signing
The Desktop App connects cloud-controlled QES workflows to local certificates, smart cards, USB tokens, and QSCD devices when browser-only signing is not enough.
Bridge responsibility
The Desktop App does not replace trust providers or certified devices. It gives your web product a controlled path to the local signing environment required by many qualified-signature flows.
- private keys never leave the QSCD or certified signing environment
- PIN and PUK values are not sent to backend systems
- optional PIN handling can use OS-native secure storage
Capabilities built for device-aware QES
Use the Desktop App when a signing workflow depends on local hardware, installed middleware, certificate selection, or device-specific user interaction.
Local device bridge
Connect browser and cloud workflows to QSCD hardware, USB tokens, smart cards, and vendor libraries on the user machine.
Certificate discovery
Detect available qualified certificates and expose the right signing options back to the product workflow.
Secure request routing
Route cloud-controlled signing intents to an authorized desktop session without exposing private keys to backend systems.
Operational diagnostics
Surface device, driver, certificate, and session state so support teams can resolve local-signing issues faster.
How the bridge fits the platform
Product teams keep orchestration, permissions, and workflow state in the cloud. The Desktop App owns the local operation that must happen near the user, certificate, and device.
- 1Your product or API creates a signing intent.
- 2The cloud layer routes the request to the authorized Desktop App session.
- 3The Desktop App talks to the local device, certificate, and signing library.
- 4The signed result returns to the workflow while key material stays local.
Security boundaries stay clear
The bridge is designed around the same separation model as the broader platform: cloud systems coordinate the workflow, while signing secrets remain inside the user-controlled local environment.