I am using smart card authentication for SSH, I documented it here: <a href="http:&#x2F;&#x2F;codebazaar.blogspot.com&#x2F;2014&#x2F;07&#x2F;how-to-ssh-with-your-smart-card.html" rel="nofollow">http:&#x2F;&#x2F;codebazaar.blogspot.com&#x2F;2014&#x2F;07&#x2F;how-to-ssh-with-your-...</a>