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Diff for /src/usr.bin/ssh/PROTOCOL.u2f between version 1.21 and 1.22

version 1.21, 2020/04/28 04:02:29 version 1.22, 2020/05/11 02:11:29
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 primarily use ECDSA signatures in the NIST-P256 field, though the FIDO2  primarily use ECDSA signatures in the NIST-P256 field, though the FIDO2
 standard specifies additional key types, including one based on Ed25519.  standard specifies additional key types, including one based on Ed25519.
   
   Use of U2F security keys does not automatically imply multi-factor
   authentication. From sshd’s perspective, a security key constitutes a
   single factor of authentication, even if protected by a PIN or biometric
   authentication.  To enable multi-factor authentication in ssh, please
   refer to the AuthenticationMethods option in sshd_config(5).
   
   
 SSH U2F Key formats  SSH U2F Key formats
 -------------------  -------------------
   
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