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<h1>The GnuTLS Transport Layer Security Library</h1>
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<p>
Welcome to <i>GnuTLS</i> project pages
</p>
<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-_0028DNSSEC_0029.html">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">cryptographic tokens</a> such as smart-cards, 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="2013-12-20">2013-12-20</div></td>
<td>
<p>
Released <a href="http://article.gmane.org/gmane.comp.encryption.gpg.gnutls.devel/7189">GnuTLS
3.2.8</a> which adds new features and optimizations in the next stable branch;
<a href="http://article.gmane.org/gmane.comp.encryption.gpg.gnutls.devel/7190">GnuTLS
3.1.18</a>, is a bug-fix release on the current stable branch.
</p>
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<td><div class="emph-box" id="2013-11-23">2013-11-23</div></td>
<td>
<p>
<a href="http://article.gmane.org/gmane.comp.encryption.gpg.gnutls.devel/7109">GnuTLS
3.2.7</a>, and <a href="http://article.gmane.org/gmane.comp.encryption.gpg.gnutls.devel/7108">GnuTLS
3.1.17</a>, were released.
</p>
</td>
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<td><div class="emph-box" id="2013-10-31">2013-10-31</div></td>
<td>
<p>
<a href="http://article.gmane.org/gmane.comp.encryption.gpg.gnutls.devel/7084">GnuTLS
3.2.6</a>,
<a href="http://article.gmane.org/gmane.comp.encryption.gpg.gnutls.devel/7083">GnuTLS
3.1.16</a>, were released and
the <a href="http://www.lulu.com/commerce/index.php?fBuyContent=10847678">
paperback manual</a> has been updated.
</p>
<p>
The <a href="http://www.gnutls.org/security.html#GNUTLS-SA-2013-3">GNUTLS-SA-2013-3</a> security advisory
has been updated.
</p>
</td>
</tr>
<tr>
<td><div class="emph-box" id="2013-10-24">2013-10-24</div></td>
<td><a href="http://www.gnutls.org/security.html#GNUTLS-SA-2013-3">Posted a security advisory</a> on a vulnerability
of the DANE library in gnutls 3.1.x and 3.2.x.
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