Hi,
maybe you can emerge tools like chrootkit or rkhunter for checking your
box for intruders. Clearly, it wouldn't help, if someone has
'bruteforced' your password, but if an intruder came throu a vunerable
application and installed a rootkit or something like that, the tools
might help you.
Furthermore it is highly recommended, that your root-password contains
of a non-dictionay alpha-numeric (at least capitals, lower case letters
and numbers) 8 character long phrase.
Greetings Christian
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