Negatory on this approach... one of the good uses for the Yubikey is TOTP[1][2] -- and TOTP must not share any key material across sites, rather, each site has

Negatory on this approach... one of the good uses for the Yubikey is TOTP[1][2] -- and TOTP must not share any key material across sites, rather, each site has its own seed. [1] http://en.wikipedia.org/wiki/Time-based_One-time_Password_Algorithm http://en.wikipedia.org/wiki/Time-based_One-time_Password_Al... [2] http://zetetic.net/software-onetime http://zetetic.net/software-onetime Disclaimer: my employer makes OneTime.