By default, the SSH service is not accessible via evdo.
Originally Posted by Minsc
By default, you cannot log in as root over ssh.
By default, you can only log in over ssh using the account you created (only you know the name of the account) and the password you gave it (only you know the password).
If you are really really really paranoid, just remove the dropbear upstart script, and ssh will stop running after a reboot. Then just use novaterm to access the command line, or install the Terminal application and use it.