I dunno about him, but I do something similar on one of my machines. I use an SCM SPR-532 USB reader with pinpad and an OpenPGP v2 smart card. More info and pictures here - <a href="https:&#x2F;&#x2F;grepular.com&#x2F;Smart_Cards_and_SSH_Authentication" rel="nofollow">https:&#x2F;&#x2F;grepular.com&#x2F;Smart_Cards_and_SSH_Authentication</a>