Type: string
Default: pgp2 (or pgp5, if PGP 2.* is not installed, or gpg, if none
of them is installed)
Set this to pgp2 (PGP 2.*), pgp5 (PGP 5.*), or gpg (GNU privacy guard), depending on the version that you primarily use. This variable is not directly used, but it is the default for the variables $pgp_receive_version, $pgp_send_version, and $pgp_key_version.