How do you know someone has tried to get into your Fedora based hd..?

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http://www.linuxquestions.org – IF an expert hack can get into a Fedora OS over the Internet.. How would you know that someone has tried to get into your hd's OS..? Are there Linux software packages that can be installed, and a window be placed on the desktop, that shows in real-time, who and what has tried to, or has, or is, infiltrated a Fedora OS..? if a Fedora OS can be compromised thus... Are there software packages that can show if someone is uploading your private files from a Fedora OS..? How do you know your OS doesn't have backdoors in it..? No "conspiracy" here.. just valid security questions that de (HowTos)