Files.com offers several 2FA methods from which your users can select for their 2FA protection.

Users may add multiple 2FA method to their accounts and have multiple active simultaneously.

Yubikey WebAuthn (Preferred)

This is the 2FA method recommended by Files.com for the greatest security. This method does not support FTP/SFTP/DAV. Learn more about Yubikeys.

WebAuthn is compatible with the previous FIDO U2F standard.

Yubikey Native

This method uses the OTP (One-time Password) feature of your Yubikey. This method supports FTP/SFTP/DAV. Blue Yubikeys are not supported.

Authenticator Apps That Use TOTP (Time-Based One-Time Password)

These include apps such as Google Authenticator, Duo, and Authy. Authenticator apps are typically installed and used on mobile devices. This method supports FTP/SFTP/DAV.

SMS (Text Messages)

This method is considered less secure than the others but still offers greater security than password alone. This method supports FTP/SFTP/DAV.

Hardware Key (WebAuthn)

This includes non-Yubikey hardware keys that support WebAuthn. This method does not support FTP/SFTP/DAV.

Email Verification

With this method, the user must supply a code sent to them via email each time they attempt to connect. Just like SMS, receiving a 2FA code with email is less secure than other options, but still better than relying on a password alone. This 2FA method is only recommended when none of the others can be used.