Summary
The GNU Privacy Guard (GnuPG) GnuPG is a complete and free implementation of the OpenPGP standard as defined by RFC4880 (also known as PGP).
gnupg, Debian package
GNU privacy guard - a free PGP replacement GnuPG is GNU’s tool for secure communication and data storage. It can be used to encrypt data and to create digital signatures. It includes an advanced key management facility and is compliant with the proposed OpenPGP Internet standard as described in RFC4880.
This package contains the full suite of GnuPG tools for cryptographic communications and data storage.