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
Technical documentation for developers:
Self-verified integration or Yubico-verified integration:
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.
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