What is GPG Paraphrasing from the Arch Wiki, GPG is basically an implementation of PGP (Pretty Good Privacy)/ RFC 4880. You can use it to sign stuff, encrypt stuff, and authenticate yourself (eg over SSH or S/MIME).
Using GPG for SSH Generate Master Key
This is the key you’ll use to create subkeys. As such you’ll want to keep this safe somewhere
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 $ gpg --full-generate-key --expert gpg (GnuPG) 2.