So which should I go for ?
Portable PGP :: PGP Everywhere!
http://www.pgpguide.20m.com/#PortablePGP
Or the horny ones version ?
http://www.gpg4usb.org/docu_concepts.html
https://www.deepdotweb.com/2015/06/21/pgp-tutorial-for-newbs-gpg4usb/
Or should I get one of these ?
https://fsfe.org/fellowship/card.en.html