GNU Privacy Guard (
GnuPG or
GPG) is a
free software replacement for
Symantec's
PGP cryptographic software suite. GnuPG is compliant with RFC 4880, which is the
IETF standards track specification of
OpenPGP. Modern versions of PGP and Veridis' Filecrypt are
interoperable with GnuPG and other OpenPGP-compliant systems.