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Gpg4win supports using SmartCards for OpenPGP and S/MIME. The default algorithm for signing and encrypting is RSA. To create OpenPGP and X.509 certificates Gpg4win uses a key length of 2048bit by default. GnuPG follows the recommendations regarding algorithms and key length of the German Federal Office for Information Security (BSI). Gpg4win is the official GnuPG distribution for Windows and provides the high cryptographic standards of the GNU Privacy Guard. Security aware system administrators should read the step by step instructions and define a systems-wide list of trusted X.509 root certificates. Now, also inexperienced users can start using S/MIME out-of-the-box. The configuration of X.509 root certificates is made simple by Gpg4win.

Gpg4win supports both: OpenPGP and S/MIME (X.509) Gpg4win Compendium: The documentation (for beginner and advanced users), available in English and German.Claws Mail: A complete email application with crypto support.GpgEX: A plugin for Microsoft Explorer (file encryption).GpgOL: A plugin for Microsoft Outlook 2003/2007/2010/2013 (email encryption).GPA: An alternative certificate manager for OpenPGP and X.509 (S/MIME).Kleopatra: A certificate manager for OpenPGP and X.509 (S/MIME) and common crypto dialogs.

GnuPG: The core this is the actual encryption tool.

Gpg4win is an installer for Windows and contains several Free Software components: Gpg4win and the software included with Gpg4win are Free Software (Open Source among other things free of charge for all commercial and non-commercial purposes). It is maintained by the developers of GnuPG. Gpg4win supports both relevant cryptography standards, OpenPGP and S/MIME (X.509), and is the official GnuPG distribution for Windows. Digital signatures make sure that it was not modified and comes from a specific sender.