Please don't use it or the library for your production environment. The server implementation in this codelab is a stab. Warning: You won't learn how to build a FIDO server. You will also learn re-auth specific best practices. You will learn how to call the Android FIDO2 API and options you can provide in order to cater various occasions. The latter case is also referred to as "step-up authentication". "Re-authentication" is when a user signs in to an app, then re-authenticates when they switch back to your app, or when trying to access an important section of your app. In this codelab, you are going to build an Android app with a simple re-authentication functionality using fingerprint sensor. The API provides a WebAuthn Client implementation, which supports the use of BLE, NFC, and USB roaming authenticators (security keys) as well as a platform authenticator, which allows the user to authenticate using their fingerprint or screenlock. The FIDO2 API allows Android applications to create and use strong, attested public key-based credentials for the purpose of authenticating users.
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