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. 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). Gpg4win is an installer package for Windows with computer programs and handbooks for EMail and file encryption. Gpg4win and the software included with Gpg4win are Free Software. You can choose all or some of the following modules during installation: GnuPG: The core; this is the actual encryption tool WinPT: A key manager and helper for various encryption matters GPA: Another key manager, tasts are simply different GPGol: A plugin for Microsoft Outlook 2003 (email encryption) GPGee: A plugin for Microsoft Explorer (file encryption) Sylpheed-Claws: A complete email program including the plugin for GnuPG