Intrusion Detection System (IDS) is a necessary component of any strategy for security policy of the company. What systems Intrusion Detection? CERIAS, the Center for Training and Research in Information Assurance and Security, defines it as follows:

"The purpose of an intrusion detection system (IDS) is to detect unauthorized access or misuse of a computer system. Intrusion detection systems are a kind of burglar alarms for computers. They sound alarms and even take corrective action when an intruder or abuser is detected. Many different intrusion detection systems have been developed detection systems, but generally fall into two categories, anomaly detection or misuse detection. anomaly detectors look for behavior that deviates from normal system usage. Misuse detectors look for behavior that matches a known attack scenario. A lot of time and effort has been invested in intrusion detection, and this list provides links to many sites that address some of these efforts "

There is a subcategory of intrusion detection systems called intrusion detection systems (NIDS). These systems monitors packets on the cable network for suspicious activity. intrusion detection systems network can control multiple computers at once on a network, while other intrusion detection systems can handle only one.

Who is breaking into your system?

A common misconception of software hackers is that it is usually people that go out of network systems and cause chaos. In reality, in particular, employees of the companies that insiders can and usually cause the most problems of security. Insiders often impersonate people have more rights then actually get to sensitive data.

How do intruders break into your system?

The most simple and easy to tame, is to let someone have physical access to a system. Despite all efforts, it is often impossible to stop someone when they have physical access to a machine. So if anyone has an account on a system already at a low permission level, another way to break in is to use the ropes to get a higher level of privileges through holes in your system. Finally, there are many ways to access the systems, even if you are working remotely. Remote intrusion techniques have become increasingly complex to manage.

How does one stop intrusions?
There are several freeware / shareware Intrusion Detection Systems and commercial systems for intrusion detection.

Open Source Intrusion Detection Systems

Below are a few of the open source intrusion detection systems:

HELP ( is described as "AIDE (Advanced Intrusion Detection Environment) is a free replacement for Tripwire. He does the same as the semi-free Tripwire and more . There are other alternatives available, why build another? All other replacements do not reach the level of Tripwire. And I wanted a program that overcomes the limitations of Tripwire. "

File System Saint ( - describes itself as ". File System Saint is a lightweight system host-based intrusion detection in priority to the speed and ease use "

Snort ( is described as "Snort ® is a prevention program and open source network intrusion detection system using a rule-based language, which combines the benefits of signature, protocol and methods anomaly based inspection. With millions of downloads to date, Snort intrusion detection technology most widely used worldwide and the prevention and became the de facto standard for the industry. "


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