= GnuPG

[[https://www.gnupg.org/|GnuPG]] stands for **GNU Privacy Guard**, and is a widely used Free Software for mail and data encryption and signing.

== Purpose

GnuPG, is a modular crypto engine allowing you to encrypt and sign your data and communications; it features a versatile key management system, along with access modules for all kinds of public key directories. 
It integrates with other applications. A number of frontend applications and libraries are available. 
The main command line interfaces are {{{gpg}}} and {{{gpgsm}}}.

== Standards

Gnu~PG is a complete and 
Free Software implementation 
of the Open~PGP standard as defined by RFC~4880 (also known as PGP). 

It also implements the Cryptographic Message Standard (CMS), needed for S/MIM~E emails
and provides supports for Secure Shell (ssh).


== Free Software

Since its introduction in 1997, Gnu~PG is Free Software (meaning that it respects your freedom). 
(Some call this "Open Source".)
Gnu~PG can be used, modified and distributed under the terms of the GNU General Public License.

== Download

See [[https://www.gnupg.org/download/index.html|Download]] page for both source code and binary releases.
And there is also a ftp [[https://www.gnupg.org/download/mirrors.html|mirror]] list.

== For Windows

[[https://www.gpg4win.org/|Gpg4win]] is a Windows version of GnuPG featuring a context menu tool, a crypto manager, and an Outlook plugin to send and receive standard Open~PGP/MIM~E mails.