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The issuer can freely set an algorithm to verify the signature on the token. However, some supported algorithms are insecure. [10] kid: Key ID A hint indicating which key the client used to generate the token signature. The server will match this value to a key on file in order to verify that the signature is valid and the token is authentic. x5c
A JSON Web Signature (abbreviated JWS) is an IETF-proposed standard (RFC 7515) for signing arbitrary data. [1] This is used as the basis for a variety of web-based technologies including JSON Web Token .
Along with JSON Web Signature (JWS), it is one of the two possible formats of a JWT (JSON Web Token). JWE forms part of the JavaScript Object Signing and Encryption (JOSE) suite of protocols. [ 2 ]
Many code signing systems will store the public key inside the signature. Some software frameworks and OSs that check the code's signature before executing will allow you to choose to trust that developer from that point on after the first run. An application developer can provide a similar system by including the public keys with the installer.
The specification allows a variety of signature formats, encryption algorithms and multiple trust domains, and is open to various security token models, such as: X.509 certificates, Kerberos tickets, User ID/Password credentials, SAML Assertions, and; custom-defined tokens. The token formats and semantics are defined in the associated profile ...
The Cryptographic Message Syntax (CMS) is the IETF's standard for cryptographically protected messages. It can be used by cryptographic schemes and protocols to digitally sign, digest, authenticate or encrypt any form of digital data.
In a digital signature system, a sender can use a private key together with a message to create a signature. Anyone with the corresponding public key can verify whether the signature matches the message, but a forger who does not know the private key cannot find any message/signature pair that will pass verification with the public key.
In contrast, a digital signature is generated using the private key of a key pair, which is public-key cryptography. [4] Since this private key is only accessible to its holder, a digital signature proves that a document was signed by none other than that holder. Thus, digital signatures do offer non-repudiation.