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What are Intrusion Detection Systems?

Intrusion Detection System (IDS) are becomingThe simplest and easiest way to break in is
a very important part of any strategy forto let someone have physical access to a
enterprisesecurity. But what are Intrusionsystem. Despite the best of efforts, it is
Detection systems? CERIAS, The Center foroften impossible to stop someone once they
Education and Research in Informationhave physical access to a machine. Also, if
Assurance  and Security, defines it this way:someone has an account on a system already,
at a low permission level, another way to
"The purpose of an intrusion detection systembreak in is to use tricks of the trade to be
(or IDS) is to detect unauthorized access orgranted higher-level privileges through holes
misuse of a computer system. Intrusionin your system. Finally, there are a lot of
detection systems are kind of like burglarways to gain access to systems even if one is
alarms for computers. They sound alarms andworking remotely. Remote intrusion techniques
sometimes even take corrective action when anhave become harder and more complex to fight.
intruder or abuser is detected. Many
different intrusion detection systems haveHow  does  one  stop  intrusions?
been developed but the detection schemes
generally fall into one of two categories,There are several Freeware/shareware
anomaly detection or misuse detection.Intrusion Detection Systems as well as
Anomaly detectors look for behavior thatcommercial  intrusion  detection  systems.
deviates from normal system use. Misuse
detectors look for behavior that matches aOpen  Source  Intrusion  Detection  Systems
known attack scenario. A great deal of time
and effort has been invested in intrusionBelow are a few of the open source intrusion
detection, and this list provides links todetection  systems:
many sites that discuss some of these
efforts"(AIDE ( Self-described as "AIDE (Advanced
Intrusion Detection Environment) is a free
There is a sub-category of intrusionreplacement for Tripwire. It does the same
detection systems called network intrusionthings as the semi-free Tripwire and more.
detection systems (NIDS). These systems areThere are other free replacements available
looking for suspicious activity and monitorso why build a new one? All the other
the packets. Network intrusion detectionreplacements do not achieve the level of
systems can monitor many computers at a timeTripwire. And I wanted a program that would
over a network, while other intrusionexceed  the  limitations  of  Tripwire."
detection  systems  may  monitor  only  one.
File System Saint ( - Self-described as,
Who  wants  to  breaking  into  your  system?"File System Saint is a lightweight
host-based intrusion detection system with
One common misconception of software hackersprimary  focus  on  speed  and  ease of use."
is that it is usually people outside your
network who break into your systems and causeSnort ( Self-described as "Snort(R) is an
mayhem. The reality, especially foropen source network intrusion prevention and
corporate workers, is that insiders can anddetection system utilizing a rule-driven
usually do cause the majority of securitylanguage, which combines the benefits of
breaches. Insiders often impersonate peoplesignature, protocol and anomaly based
with more privileges then themselves to gaininspection methods. With millions of
access  to  sensitive  information.downloads to date, Snort is the most widely
deployed intrusion detection and prevention
How  do  intruders  break  into  your system?technology worldwide and has become the de
facto standard for the industry.



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