In addition they provide a broad theoretical background and knowledge beyond the main subject of studieare promoted rather as solutions designed to prepare you to quickly start your first job and are aimed at learning how to work with specific languages and technfor tokens that use nested signing or encryption. In the case of other tokens Phone Number List the use of this claim is not recommended. For the indicated cases it is required to pass this header with the value JWT There is also a quite extensive list of claims defined in RFC . This document describes JSON Web Signature JWS i.e. JSON Web Token signed using a defined algorithm. This means that JWT in the most popular sense of this term is actually JWS. The most interesting JOSE Headers related to JSON Web Signature include kid – identifier of the key used to sign the token.
The parameter is useful when there are many token signing keys in the system alg – defines the algorithm used to sign tokens jwk – stores the public key used to sign the JWS. The key structure is described in RFC We will come back to the topic of JWK. jku – URI that directs to the public key used to verify the token. Algorithm The claim alg defining the algorithm is so important that it is worth spending some time on it. In order to generate the correct JWT it is required to pass one of the supported algorithms or values none . A list of suggested algorithms can also be found on the IANA website . The most popular algorithms include HMAC with SHA SHA or SHA HS HS HS . Symmetric encryption is used here and a single secret is required for both signing and verifying the authenticity of the token _ uses asymmetric cryptography which requires a public and private key pair.