GnuPG (more commonly known as GPG) is an implementation of a standard known as PGP (Pretty Good Privacy). It uses a system of "public" and "private" keys for the encryption and signing of messages or data
GnuPG is a complete and free implementation of the OpenPGP standard as defined by RFC4880 (also known as PGP). GnuPG allows 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. GnuPG, also known as GPG, is a command line tool with features for easy integration with other applications. A wealth of frontend applications and libraries are available. GnuPG also provides support for S/MIME and Secure Shell (ssh)... continue reeding