UAF, from the folks behind U2F, does basically this:<p><a href="https:&#x2F;&#x2F;www.ietf.org&#x2F;proceedings&#x2F;92&#x2F;slides&#x2F;slides-92-tokbind-3.pdf" rel="nofollow">https:&#x2F;&#x2F;www.ietf.org&#x2F;proceedings&#x2F;92&#x2F;slides&#x2F;slides-92-tokbind...</a><p>As far as usability, at least U2F is amazingly frictionless; enrollment is &#x27;put the dongle in and hit the button&#x27;, login is &#x27;put the dongle in and hit the button.&#x27;