How Do Intruders Break into Your System?
The simplest and easiest way to break in is to let someone have physical access to a system. Despite the best of efforts, it is often impossible to stop someone once they have physical access to a machine.
 
Also, if someone has an account on a system already, at a low permission level, another way to break in is to use tricks of the trade to be granted higher-level privileges through holes in your system. Finally, there are many ways to gain access to systems even if one is working remotely. Remote intrusion techniques have become harder and more complex to fight.
 
How Does One Stop Intrusions?
There are several Freeware/shareware Intrusion Detection Systems as well as commercial intrusion detection systems.
 
Open Source Intrusion Detection Systems
Below are a few of the open source intrusion detection systems:
 
* AIDE ( http://sourceforge.net/projects/aide) - Self-described as "AIDE (Advanced Intrusion Detection Environment) is a free replacement for Tripwire. It does the same things as the semi-free Tripwire and more. There are other free replacements available so why build a new one? All the other replacements do not achieve the level of Tripwire. And I wanted a program that would exceed the limitations of Tripwire."
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