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<h1>The GnuTLS Transport Layer Security Library</h1>
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Welcome to <i>GnuTLS</i> project pages
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<ul>
<li><a name="overview"><b>Overview</b></a>
<p> GnuTLS is a secure communications library implementing the <a href="http://datatracker.ietf.org/wg/tls/charter/">SSL, TLS and DTLS protocols</a>
and technologies around them. It provides a simple C language application programming interface (API)
to access the secure communications protocols as well as APIs to parse and
write X.509, PKCS #12, OpenPGP and other required structures. It is
aimed to be portable and efficient with focus on security and interoperability.
</p></li>
<li><a name="features"><b>Features</b></a>
<ul>
<li>Support for <a href="http://tools.ietf.org/html/rfc5247">TLS 1.2</a>, TLS 1.1, TLS 1.0, and SSL 3.0 protocols</li>
<li>Support for <a href="http://tools.ietf.org/html/rfc6347">DTLS 1.2</a>, and DTLS 1.0, protocols</li>
<li>Support for certificate path validation, as well as <a href="http://www.gnutls.org/manual/html_node/Verifying-a-certificate-using-DANE.html#Verifying-a-certificate-using-DANE">DANE</a> and <a href="http://www.gnutls.org/manual/html_node/Verifying-a-certificate-using-trust-on-first-use-authentication.html#Verifying-a-certificate-using-trust-on-first-use-authentication">trust on first use</a>.</li>
<li>Support for the <a href="http://www.gnutls.org/manual/html_node/OCSP-certificate-status-checking.html">Online Certificate Status Protocol (OCSP)</a>.</li>
<li>Support for multiple certificate types including X.509 and <a href="openpgp.html">OpenPGP</a> certificates.</li>
<li>Support for public key methods, including RSA and Elliptic curves, as well as password and key authentication methods such as <a href="http://www.gnutls.org/manual/html_node/Authentication-using-SRP.html#Authentication-using-SRP">SRP</a> and <a href="http://www.gnutls.org/manual/html_node/Authentication-using-PSK.html#Authentication-using-PSK">PSK</a> protocols.</li>
<li>Support for all the strong encryption algorithms, including AES and Camellia.
<li>Support for CPU-assisted cryptography with VIA padlock and AES-NI instruction sets.
<li>Support for cryptographic accelerator drivers via <a href="http://www.cryptodev-linux.org/">/dev/crypto</a>.
<li>Supports natively <a href="http://www.gnutls.org/manual/html_node/Smart-cards-and-HSMs.html#Smart-cards-and-HSMs">HSMs and cryptographic tokens</a>, via PKCS #11 and the <a href="http://www.gnutls.org/manual/html_node/Trusted-Platform-Module.html#Trusted-Platform-Module">Trusted Platform Module (TPM)</a>.</li>
<li>Runs on most Unix platforms and Windows.</li>
</ul>
</li>
<li><a name="license"><b>License</b></a>
<p>The core library licensed under
the <a href="http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html">GNU
Lesser General Public License version 2.1</a> (LGPLv2.1+). The
LGPL license is compatible with a wide range of free licenses,
and even permit you to use GnuTLS in non-free proprietary
programs. </p> </li>
</ul>
<ul>
<li><a name="documentation"><b>Documentation:</b></a>
<p>
You can obtain <a href="http://www.lulu.com/shop/nikos-mavrogiannopoulos-and-simon-josefsson/the-gnutls-manual/paperback/product-18963264.html">
GnuTLS' manual at lulu.com</a> or download
<a href="documentation.html">any of the electronic formats</a>.
</p>
</ul>
<p>
For more information on GnuTLS features, see the <a
href="https://en.wikipedia.org/wiki/Comparison_of_TLS_Implementations">
wikipedia article comparing different TLS implementations</a>.
</p>
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News flashes
<a href="https://twitter.com/GnuTLS" class="twitter-follow-button" data-show-count="false">Follow @GnuTLS</a>
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<td><div class="emph-box" id="2015-11-23">2015-11-23</div></td>
<td>
<p>
Added a description of the new <a href="http://nmav.gnutls.org/2015/11/an-overview-of-gnutls-34x.html"> features in GnuTLS 3.4.x</a>.
</p>
</td>
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<tr>
<td><div class="emph-box" id="2015-11-22">2015-11-22</div></td>
<td>
<p>
Released <a
href="http://permalink.gmane.org/gmane.comp.encryption.gpg.gnutls.devel/8350">GnuTLS
3.3.19</a> and <a
href="http://permalink.gmane.org/gmane.comp.encryption.gpg.gnutls.devel/8351">GnuTLS
3.4.7</a> which are bug fix releases in the current and next stable branches.
</p>
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<td><div class="emph-box" id="2015-10-20">2015-10-20</div></td>
<td>
<p>
Released
<a href="http://permalink.gmane.org/gmane.comp.encryption.gpg.gnutls.devel/8323">GnuTLS
3.4.6</a> a bug fix release in the next stable branch.
</p>
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<td><div class="emph-box" id="2015-09-20">2015-09-20</div></td>
<td>
<p>
Added <a href="http://www.gnutls.org/abi-tracker/timeline/gnutls/index.html">ABI
tracker report for the main library</a>.
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