.GPG File Extension
File TypeGNU Privacy Guard Public Keyring
What is a GPG file?
A GPG file is a security key used to decrypt an encrypted file generated by GNU Privacy Guard (GnuPG), a file encryption program. The secure format is based on the OpenPGP standard defined by RFC2440, the same standard Pretty Good Privacy (.PGP) files use.
NOTE: Unlike PGP software, GnuPG is a free program.