Hello @muitotri
While Yubikey has a few different methods for authentication (FIDO, OTP, Smartcard etc depending on which kind of Yubikey you have), they one I’ve tried is smartcard authentication.
It was fairly straight forward, using Authentication in ThinLinc with PKCS #15 smart cards as a guide.
After installing opensc and using pkcs15-tool to read the public key of the yubikey, I just had to place the key in authorized_keys as per the guide states above.
Would be interesting to hear if anyone else tried something different ?
/Martin