In terms of Single Sign-On (SSO), it means that a service provider can receive trustworthy information from the authentication server.īy sharing a secret key with the Identity Provider, the Service Provider can hash a part of a token it receives and compare it to the signature of the token. When it comes to API authentication and server-to-server authorization, JSON web token ( JWT) is particularly a useful technology. How does JWT Authentication work? When to use JWT Authentication? The header and Payload section of the JWT is always Base64 encoded. It can also be used to validate the sender. Signature is used to validate that the JWT token wasn’t modified or changed during transit. The algorithm which is used to create the signature is the same algorithm mentioned in the header section of the JWT. This is typically a hash of the header and payload sections of the JWT. The payload usually contains the claims (user attributes) and additional data like issuer, expiration time, and audience. The type of token, which is in this case mostly “JWT”.JWT structure is divided into three parts: header, payload, signature & is separated from each other by dot (.), and will follow the below structure: And that is why it’s highly recommended to use HTTPS with Signed JWTs. The purpose of Signed JWT is not to hide the data but to ensure the authenticity of the data. JWTs can be encrypted, but they are typically encoded & signed. It is popularly used as a client-side-based stateless session, this means the server doesn’t have to completely rely on a data store (or) database to save session information.
JWT authentication is a token-based stateless authentication mechanism. It’s also a popular way to authenticate/authorize users in a microservice architecture. It’s usually used in the context of other authentication mechanisms like OAuth, OpenID to share user-related information. In most cases, it’s an encoded JSON containing a set of claims and a signature. JWT, or JSON Web Token, is an open standard used to share information between two parties securely - a client and a server.
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