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<!-- This manual is last updated 4 March 2015 for version
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Copyright (C) 2001-2015 Nikos Mavrogiannopoulos
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<title>GnuTLS 3.4.9: Introduction to TLS</title>
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<a name="Introduction-to-TLS"></a>
<div class="header">
<p>
Next: <a href="Authentication-methods.html#Authentication-methods" accesskey="n" rel="next">Authentication methods</a>, Previous: <a href="Introduction-to-GnuTLS.html#Introduction-to-GnuTLS" accesskey="p" rel="prev">Introduction to GnuTLS</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>
</div>
<hr>
<a name="Introduction-to-TLS-and-DTLS"></a>
<h2 class="chapter">3 Introduction to <acronym>TLS</acronym> and <acronym>DTLS</acronym></h2>
<p><acronym>TLS</acronym> stands for “Transport Layer Security” and is the
successor of SSL, the Secure Sockets Layer protocol [<em>SSL3</em>]
designed by Netscape. <acronym>TLS</acronym> is an Internet protocol, defined
by <acronym>IETF</acronym><a name="DOCF3" href="#FOOT3"><sup>3</sup></a>, described in [<em>RFC5246</em>].
The protocol provides
confidentiality, and authentication layers over any reliable transport
layer. The description, above, refers to <acronym>TLS</acronym> 1.0 but applies
to all other TLS versions as the differences between the protocols are not major.
</p>
<p>The <acronym>DTLS</acronym> protocol, or “Datagram <acronym>TLS</acronym>” [<em>RFC4347</em>] is a
protocol with identical goals as <acronym>TLS</acronym>, but can operate
under unreliable transport layers such as <acronym>UDP</acronym>. The
discussions below apply to this protocol as well, except when
noted otherwise.
</p>
<table class="menu" border="0" cellspacing="0">
<tr><td align="left" valign="top">• <a href="TLS-layers.html#TLS-layers" accesskey="1">TLS layers</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">• <a href="The-transport-layer.html#The-transport-layer" accesskey="2">The transport layer</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">• <a href="The-TLS-record-protocol.html#The-TLS-record-protocol" accesskey="3">The TLS record protocol</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">• <a href="The-TLS-Alert-Protocol.html#The-TLS-Alert-Protocol" accesskey="4">The TLS Alert Protocol</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">• <a href="The-TLS-Handshake-Protocol.html#The-TLS-Handshake-Protocol" accesskey="5">The TLS Handshake Protocol</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">• <a href="TLS-Extensions.html#TLS-Extensions" accesskey="6">TLS Extensions</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">• <a href="How-to-use-TLS-in-application-protocols.html#How-to-use-TLS-in-application-protocols" accesskey="7">How to use TLS in application protocols</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">• <a href="On-SSL-2-and-older-protocols.html#On-SSL-2-and-older-protocols" accesskey="8">On SSL 2 and older protocols</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
</table>
<div class="footnote">
<hr>
<h4 class="footnotes-heading">Footnotes</h4>
<h3><a name="FOOT3" href="#DOCF3">(3)</a></h3>
<p>IETF, or Internet Engineering Task Force,
is a large open international community of network designers,
operators, vendors, and researchers concerned with the evolution of
the Internet architecture and the smooth operation of the Internet.
It is open to any interested individual.</p>
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