OpenSSH: 8.2 Release Notes

This release adds support for FIDO/U2F hardware authenticators to
OpenSSH. U2F/FIDO are open standards for inexpensive two-factor
authentication hardware that are widely used for website
authentication. In OpenSSH FIDO devices are supported by new public
key types “ecdsa-sk” and “ed25519-sk”, along with corresponding
certificate types.

FIDO/U2F OpenSSH keys consist of two parts: a “key handle” part stored
in the private key file on disk, and a per-device private key that is
unique to each FIDO/U2F token and that cannot be exported from the
token hardware. These are combined by the hardware at authentication
time to derive the real key that is used to sign authentication
challenges.

For tokens that are required to move between computers, it can be
cumbersome to have to move the private key file first. To avoid this
requirement, tokens implementing the newer FIDO2 standard support
“resident keys”, where it is possible to effectively retrieve the key
handle part of the key from the hardware.

Source: https://www.openssh.com/releasenotes.html#8.2

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