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Permit root to login via ssh server configurationonly with key-based authentication

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ssh server configuration

I have some doubts about certain ssh server configurations on /etc/ssh/sshd_config. I want the next behavior:

  1. Public key authentication is the only way to authenticate as root (no password authentication or other)
  2. Normal users can use both (password and public key authentication)

If I set PasswordAuthentication no my first point is satisfied but not the second. There is a way to set PasswordAuthentication no only for root?