"Consider this scenario... Your machine running GNU/Linux has
been penetrated by a hacker without your knowledge and he has
swapped the passwd program which you use to change the user
password with one of his own. His passwd program has the same name
as the real passwd program and works flawlessly in all respects
except for the fact that it will also gather data residing on your
machine such as the user details each time it is run and transmit
it to a remote location or it will open a back door for outsiders
by providing easy root access and all the time, you will be
impervious about its actions. This is an example of your machine
getting rooted--another way of saying your machine is compromised.
And the passwd program which the hacker introduced into your
machine is a trojaned rootkit..."
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