Concepts
Concepts
The ideas behind FaceCard: apps, keys, tokens, challenges, matching and liveness.
Read these pages once and the rest of the docs will make sense.
| Page | What it covers |
|---|---|
| Apps and keys | An app is your isolation boundary. Secret keys, publishable keys and the Origin allow list. |
| User tokens and JWKS | The signed token a successful sign-in returns, and how to verify it. |
| Challenges and replay protection | Why every enroll and match needs a fresh single-use challenge. |
| Matching: threshold and margin | How a face is compared and when the answer is no_match. |
| Liveness is advisory | What the browser liveness check does and does not protect against. |