USB device to store priv keys

Interesting talk here at ccc

http://www.youtube.com/watch?v=CgaBKNus1n0

It's designed for crypto currency private keys, but in the talk he shows
how it can be simultaneously used for other keys such as for identity

It's also all free software so you can flash your own firmware, e.g. to
make a webid solution that could work in an internet cafe ...