GnuPG (GNU Privacy Guard) is a GNU utility for encrypting data and
creating digital signatures. GnuPG has advanced key management
capabilities and is compliant with the proposed OpenPGP Internet
standard described in RFC2440. Since GnuPG doesn't use any patented
algorithm, it is not compatible with any version of PGP2 (PGP2.x uses
only IDEA for symmetric-key encryption, which is patented worldwide).
gpg gpg is the OpenPGP only version of the GNU Privacy Guard (GnuPG). It is a tool to provide digital encryption and signing services using the OpenPGP standard... gpgv gpgv is an OpenPGP signature verification tool. This program is actually a stripped-down version of gpg which is only able to check signatures. It is somewhat... gpg-zip gpg-zip encrypts or signs files into an archive. It is an gpg-ized tar using the same format as used by PGP's PGP Zip.