![]() JavaScript on the client passes that request to the authenticator using the WebAuthn API, then the authenticator verifies the credential and returns a key, which is passed back to the service provider. The user hits a Sign-in button and the service provider sends identifying information (credential ID and a challenge nonce). The public key, credential ID, and challenge nonce, along with optional additional information, are passed back to the service provider the provider checks the challenge nonce for tampering and then stores the public key and credential ID for future use.Īuthentication functions similarly, though the content of the data passed around is slightly different. The WebAuthn API passes the request to a connected authenticator, which normally requests some form of user verification (such as a PIN number or fingerprint), then generates a key pair for future verification and a credential ID to scope the relying party. A JavaScript function on the client re-encodes and formats the data for the WebAuthn API, and the generated JavaScript object is passed to the browser’s () function. In this application, the user hits a Register button and the server responds with information about the origin of the registration (hostname and origin), a byte-based user handle for identification, a randomly generated challenge nonce, and other optional information about the type of registration the server will accept. Authentication is the process of requesting a credential from an authenticator, then verifying its validity. Both the authenticator and server will store some information about the other party. Registration is the process of generating, scoping, and storing a public key for authentication. ![]() There are two distinct steps for using WebAuthn: credential registration and credential authentication. The private key used to generate the credentials is also kept hidden by the authenticator, so the authenticating software and service provider are less susceptible to malicious actors. The service provider must identify the application based on this key. WebAuthn authenticator generates a public-private key pair, using public-key cryptography, scoped to a specific URI to be used for authentication.
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