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<p>An <b>authentication server</b> provides a <a href="Network_service" title="Network service">network service</a> that applications use to <a href="Authentication" title="Authentication">authenticate</a> the credentials,<sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> usually account names and passwords, of their users. When a client submits a valid set of credentials, it receives a <a href="Cryptographic" class="mw-redirect" title="Cryptographic">cryptographic</a> ticket that it can subsequently use to access various services.
</p><p>Authentication is used as the basis for <a href="Authorization" title="Authorization">authorization</a>, which is the determination whether a <a href="Privilege_(computing)" title="Privilege (computing)">privilege</a> may be granted to a particular user or <a href="Process_(computing)" title="Process (computing)">process</a>, <a href="Privacy" title="Privacy">privacy</a>, which keeps information from becoming known to non-participants, and <a href="Non-repudiation" title="Non-repudiation">non-repudiation</a>, which is the inability to deny having done something that was <a href="Authorized" class="mw-redirect" title="Authorized">authorized</a> to be done based on the <a href="Authentication" title="Authentication">authentication</a>.
</p><p>Major authentication <a href="Algorithm" title="Algorithm">algorithms</a> include <a href="Password" title="Password">passwords</a>, <a href="Kerberos_(protocol)" title="Kerberos (protocol)">Kerberos</a>, and <a href="Public_key_encryption" class="mw-redirect" title="Public key encryption">public key encryption</a>.
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<div class="mw-heading mw-heading2"><h2 id="See_also">See also</h2></div>
<ul><li><a href="TACACS%2B" class="mw-redirect" title="TACACS+">TACACS+</a></li>
<li><a href="RADIUS" title="RADIUS">RADIUS</a></li>
<li><a href="Multi-factor_authentication" title="Multi-factor authentication">Multi-factor authentication</a></li>
<li><a href="Universal_2nd_Factor" title="Universal 2nd Factor">Universal 2nd Factor</a></li></ul>
<div class="mw-heading mw-heading2"><h2 id="References">References</h2></div>
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<li id="cite_note-1"><span class="mw-cite-backlink"><b><a href="#cite_ref-1">^</a></b></span> <span class="reference-text"><style data-mw-deduplicate="TemplateStyles:r1238218222">
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</style><cite id="CITEREFHongLeeParkCho2000" class="citation journal cs1">Hong, S.-M.; Lee, S.; Park, Y.; Cho, Y.; Yoon, H. (2000-11-01). <span class="id-lock-subscription" title="Paid subscription required"><a rel="nofollow" class="external text" href="https://linkinghub.elsevier.com/retrieve/pii/S0140366400002504">"On the construction of a powerful distributed authentication server without additional key management"</a></span>. <i>Computer Communications</i>. <b>23</b> (17): <span class="nowrap">1638–</span>1644. <a href="Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1016%2FS0140-3664%2800%2900250-4">10.1016/S0140-3664(00)00250-4</a>.</cite></span>
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<div class="mw-heading mw-heading2"><h2 id="External_links">External links</h2></div>
<ul><li><a rel="nofollow" class="external text" href="https://www.ibm.com/docs/en/host-on-demand/14.0?topic=SSS9FA_14.0.0/com.ibm.hod.doc/help/serverauth.htm">"Server authentication"</a>. <i>www.ibm.com</i>. Retrieved 2023-09-05.</li>
<li><a rel="nofollow" class="external text" href="https://blog.servermania.com/choosing-a-small-business-server">Business server</a></li></ul>
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