Notes to self re: GPG
If brew installs GPG to gpg2, consider symlinking to gpg.
Generate a key
$ gpg --gen-key
Sign and encrypt
$ gpg --armor --sign --encrypt --recipient='foo@bar.com' --output=baz.gpg baz
Decrypt
$ gpg --decrypt baz.gpg
List/export keys
$ gpg --list-keys
$ gpg --armor --output my-public.key --export 'foo@bar.com'
$ gpg --armor --output my-private.key --export-secret-key 'foo@bar.com'