Gpg4win (GNU Privacy Guard for Windows) is encryption software for files and emails.

Gpg4win enables users to securely transport emails and files with the help of encryption and digital signatures. Encryption protects the contents against an unwanted party reading it. Digital signatures make sure that it was not modified and comes from a specific sender.

Gpg4win supports both relevant cryptography standards, OpenPGP and S/MIME (X.509), and is the official GnuPG distribution for Windows. It is maintained by the developers of GnuPG.

Creation of Gpg4win was supported by the German Federal Office for Information Security (BSI).

Gpg4win is an installer for Windows and contains several Software components:

GnuPG
• The backend; this is the actual encryption tool.

Kleopatra
• A certificate manager for OpenPGP and X.509 (S/MIME) and common crypto dialogs.

GPA
• An alternative certificate manager for OpenPGP and X.509 (S/MIME).

GpgOL
• A plugin for the 32bit versions of Microsoft- Outlook 2003/2007/2010/2013/2016 (email encryption). With Outlook 2010 and higher GpgpOL supports MS Exchange Server.

GpgEX
• A plugin for Microsoft- Explorer (file encryption).

Gpg4win Compendium
• The documentation (for beginner and advanced users), available in English and German.