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Security tokens assert claims and can be used to assert the binding between authentication secrets or keys and security identities. An authority can vouch for or endorse the claims in a security token by using its key to sign or encrypt (it is recommended to use a keyed encryption) the security token thereby enabling the authentication of the claims in the token. An X.509 [X509] certificate, claiming the binding between one’s identity and public key, is an example of a signed security token endorsed by the certificate authority. In the absence of endorsement by a third party, the recipient of a security token may choose to accept the claims made in the token based on its trust of the producer of the containing message.
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