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<title>GnuTLS 3.4.8: Authentication methods</title>
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<a name="Authentication-methods"></a>
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<p>
Next: <a href="Hardware-security-modules-and-abstract-key-types.html#Hardware-security-modules-and-abstract-key-types" accesskey="n" rel="next">Hardware security modules and abstract key types</a>, Previous: <a href="Introduction-to-TLS.html#Introduction-to-TLS" accesskey="p" rel="prev">Introduction to TLS</a>, Up: <a href="index.html#Top" accesskey="u" rel="up">Top</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Function-and-Data-Index.html#Function-and-Data-Index" title="Index" rel="index">Index</a>]</p>
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<hr>
<a name="Authentication-methods-1"></a>
<h2 class="chapter">4 Authentication methods</h2>
<a name="index-authentication-methods"></a>
<p>The initial key exchange of the TLS protocol performs authentication
of the peers. In typical scenarios the server is authenticated to
the client, and optionally the client to the server.
</p>
<p>While many associate TLS with X.509 certificates and public key
authentication, the protocol supports various authentication methods,
including pre-shared keys, and passwords. In this chapter a description
of the existing authentication methods is provided, as well as some
guidance on which use-cases each method can be used at.
</p>
<table class="menu" border="0" cellspacing="0">
<tr><td align="left" valign="top">• <a href="Certificate-authentication.html#Certificate-authentication" accesskey="1">Certificate authentication</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">• <a href="More-on-certificate-authentication.html#More-on-certificate-authentication" accesskey="2">More on certificate authentication</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">• <a href="Shared_002dkey-and-anonymous-authentication.html#Shared_002dkey-and-anonymous-authentication" accesskey="3">Shared-key and anonymous authentication</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">• <a href="Selecting-an-appropriate-authentication-method.html#Selecting-an-appropriate-authentication-method" accesskey="4">Selecting an appropriate authentication method</a>:</td><td> </td><td align="left" valign="top">
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