Key 'storage' by abusing U2F devices
This is a proof of concept for abusing U2F devices and the cryptography they use to derive a stable secret.
If you're brave or reckless, you could use this technique to derive keys to encrypt your disk, or password database, or SSH keys.
See https://jbp.io/2015/11/23/abusing-u2f-to-store-keys/ for the background.
You need python-u2flib-host first: https://github.com/Yubico/python-u2flib-host
python u2fkey.py enroll to set things up. This will print the key
value and store state to
data.json in the working directory.
python u2fkey.py auth to get the key value back.