Password types[ edit ] All tokens contain some secret information that is used to prove identity. There are four different ways in which this information can be used: Asynchronous password token for online banking. Static password token The device contains a password which is physically hidden not visible to the possessorbut which is transmitted for each authentication.
Tokens Tokens There are basically two main types of tokens that are related to identity: ID tokens and access tokens. For example, if there's an app that uses Google to log in users and to sync their calendars, Google sends an ID token to the app that includes information about the user.
A token is an instance of a sequence of characters in some particular document that are grouped together as a useful semantic unit for processing.
The app then parses the token's contents and uses the information including details like name and profile picture to customize the user experience.
Be sure to validate ID tokens before using the information it contains.
You can use a library to help with this task. Each token contains information for the intended audience which is usually the recipient. According to the OpenID Connect specification, the audience of the ID token indicated by the aud claim must be the client ID of the application making the authentication request.
If this is not the case, you should not trust the token. The audience the aud claim of the token is set to the application's identifier, which means that the token looks like this specific application should consume this token.
See the JWT Handbook for more information.
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The token looks like tokens Access tokens which aren't always JWTs are used to inform an API that the bearer of the token has been authorized to access the API and perform a predetermined set of actions specified by the scopes granted. In the Google example above, Google sends an access token to the app after the user logs in and provides consent for the app to read or write to their Google Calendar.
Access tokens must never be used for authentication.
What is JSON Web Token?
Access tokens cannot tell if the user has authenticated. The only user information the access token possesses is the user ID, located in the sub claim.
In your applications, treat access tokens as opaque strings since they are meant for APIs. Your application should not attempt to decode them or expect to receive tokens in a particular format.
When should you use JSON Web Tokens?
It only contains authorization information about which actions the application is allowed to perform at the API scope claim. This is what makes it useful for securing an API, but not for authenticating a user.
Specialized tokens There are three specialized tokens used in Auth0's token-based authentication scenarios: Refresh tokens: A token used to obtain a renewed access token without having to re-authenticate the user. IDP access tokens: Access tokens issued by identity providers after user authentication that you can use to call the third-party APIs.
Therefore, a JWT typically looks like the following. Payload The second part of the token is the payload, which contains the claims.