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A defined sequence of messages between a Claimant and a Verifier that demonstrates that the Claimant has possession and control of a valid token to establish his/her identity, and optionally, demonstrates to the Claimant that he or she is communicating with the intended Verifier.
SOURCE: SP 800-63
A well-specified message exchange process between a claimant and a verifier that enables the verifier to confirm the claimant’s identity. SOURCE: CNSSI-4009
