2-step U2F authentification (Hardware key eg. Yubikey)

2-step verification with a hardware key (FIDO2/U2F).

The most secure and convenient use to authenticate login.

eg.  yubico.com, solokeys.com ...

--

FIDO2, U2F dongle support

Yubikey: yubico.com

yubico.com/why-yubico/how-the-...

Technical documentation for developers:

yubico.com/why-yubico/for-deve...

Self-verified integration or Yubico-verified integration:

yubico.com/works-with-yubikey

--

After implementation, it would be nice to add to the directory: yubico.com/pl/works-with-yubik...

By the way, it is also an advertisement, because the promoted U2F solution in the catalog.