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An authentication server provides a network service that applications use to authenticate the credentials,[1] usually account names and passwords, of their users. When a client submits a valid set of credentials, it receives a cryptographic ticket that it can subsequently use to access various services.
Authentication is used as the basis for authorization, which is the determination whether a privilege may be granted to a particular user or process, privacy, which keeps information from becoming known to non-participants, and non-repudiation, which is the inability to deny having done something that was authorized to be done based on the authentication.
Major authentication algorithms include passwords, Kerberos, and public key encryption.
^Hong, S.-M.; Lee, S.; Park, Y.; Cho, Y.; Yoon, H. (2000-11-01). "On the construction of a powerful distributed authentication server without additional key management". Computer Communications. 23 (17): 1638–1644. doi:10.1016/S0140-3664(00)00250-4.
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