A quick Unix
measure you can take to prevent other folks (or evil cracker
s) from getting access to your root account
is to create file called /etc/securetty
An example of how to make such a file is (assuming korn shell prompt of $):
$cat > /etc/securetty
This allows you to have, in this example, only the first four consoles available for root login. Should anyone else attempt to login as root, even if they have the correct password, the system will just say that the login is incorrect. Usually this will discourage crackers from trying, since they think the password was changed.