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A library implementing TLS 1.0 and SSL 3.0 protocols

GnuTLS is a secure communications library implementing the SSL, TLS and DTLS protocols.

It is provided in the form of a C library to support the protocols, as well as to parse and write X.5009, PKCS 12, OpenPGP and other required structures.


Online documentation available in many formats at:


Download version 3.5.8 (stable)
released on 9 January 2017

VCS Checkout


Related Projects


LicenseVerified byVerified onNotes
LGPLv3orlaterGenium13 November 2014
binaries of the gmplib library need to be distributed under either LGPLv3+ or GPLv2+ license.
GPLv3orlaterGenium13 November 2014
LGPLv2.1orlaterGenium13 November 2014
core library

Leaders and contributors

Simon Josefsson Maintainer

Resources and communication

Audience Resource type URI
User,Developer Bug Tracking
Bug Tracking E-mail
Help E-mail
Developer Mailing List Info/Archive
Support Mailing List Info/Archive
FTP Mirrors Download
Developer VCS Repository Webview

Software prerequisites

Kind Description
Weak prerequisite gdbm
Weak prerequisite zlib
Source requirement libgcrypt
Required to build libgcrypt

This entry (in part or in whole) was last reviewed on 26 January 2017.


Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.3 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the page “GNU Free Documentation License”.

The copyright and license notices on this page only apply to the text on this page. Any software or copyright-licenses or other similar notices described in this text has its own copyright notice and license, which can usually be found in the distribution or license text itself.

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