This value means that the token is unsigned and therefore its authenticity cannot be verified. Attempting to pass tokens with a value none is an attack vector against applications Phone Number List that incorrectly handle tokens with that value. If the application treats such tokens as valid it becomes possible to generate any valid token. It clearly indicates the existence ofapplication. If the token is used for example to determine the user's role it is an open door to escalation of privileges.
JSON Web Key JWK JSON Web Key is a data structure representing a cryptographic key that is used to sign tokens. It is possible to use both one key and an array of keys. The following claims are described for the JWK definition in the RFC kty – defines a family of algorithms used for cryptographic purposes. Defining a claim kty is mandatory use – defines the purpose of the key. The RFC defines two suggested values signature for JWS and encryption for JWE more on that later key_opts – defines the operations for which the key is to be used The purpose of claims alg is kid similar to what was described earlier. The only exception is that for JWK alg it is an optional claim. Depending on the selected algorithm family the remaining claims will look different.