However, your key may or may not support it and only a limited number of resident keys may be stored on a device. The private key file is actually a key handle that cannot be used without the hardware token, however, the hardware token can also not be used without the key handle.Ī resident key solves this problem by storing the key handle on the device. When generating the key, ssh-keygen will create private and public key files that look similar to normal ssh key. If not, use options 3 or 4.Ī U2F attestation requires a key handle to be sent to the device. You must choose if you want to store the key handle as a resident key on the device. If it does not work due to device incompatibilities, fall back on ecdsa-sk (Options 2 or 4) You must choose between ed25519-sk and ecdsa-sk. Using it on macOS with full support for ssh-agent is a bit more complex. SSH 8.2 introduced support for using any U2F key in place of a private key file.
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