When the FIDO is applied to a two-factor authentication scenario, a portable security key hardware device may also be required in addition to a password as the second factor to perform authentication. The appearance of FIDO security key hardware devices is similar to that of USB flash drives and USB keys. They also function like some USB keys. You need to touch the buttons on them to confirm your operation.

To some extent, a HUAWEI FIDO security key can serve as a substitute for a security key hardware device. This can be used for authentication when a FIDO security key hardware device is required.