Support FIDO2/CTAP2 security tokens as keystore

[Rene 'Renne' Bartsch, B.Sc. Informatics]

Hi,

currently the private key ist stored on HDD which is quite insecure.
I suggest to support FIDO2/CTAP2 security tokens as keystore (see 
https://en.wikipedia.org/wiki/Client_to_Authenticator_Protocol).

Have Phun,

Renne