GnuPG the GNU Privacy Guard or GPG is GNU’s secure communication and data storage tool. GnuPG is essentially a free and open source replacement for PGP – it complies with the IETF standard for PGP: OpenPGP. This means that GnuPG is compatible with the proprietary PGP. Versions are available for Windows and Linux/Unix, and it is often bundled with Unix or Linux distributions. A native OSX port is available as well, called MacGPG. GPG is front-ended graphically by Seahorse (GN