Protocol-based intrusion detection system: Difference between revisions

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A '''Protocol-based Intrusion Detection System (PIDS)''', is a special category of an [[Intrusion detection system|Intrusion-Detection System]], and focuses its monitoring and analysis on the protocol or protocols in use by the computing system.

A '''protocol-based intrusion detection system''' ('''PIDS''') is an [[intrusion detection system]] which is typically installed on a [[web server]], and is used in the monitoring and analysis of the [[Communications protocol|protocol]] in use by the computing system. A PIDS will monitor the dynamic behavior and state of the protocol and will typically consist of a system or agent that would typically sit at the front end of a server, monitoring and analyzing the communication between a connected device and the system it is protecting.

A typical use for a PIDS would be at the front end of a web server monitoring the [[HTTP]] (or [[HTTPS]]) stream.<ref>{{Cite web |date=2023-04-19 |title=What is an Intrusion Detection System (IDS)? {{!}} IBM |url=https://www.ibm.com/topics/intrusion-detection-system |access-date=2024-07-09 |website=www.ibm.com |language=en-us}}</ref> Because it understands the HTTP relative to the web server/system it is trying to protect it can offer greater protection than less in-depth techniques such as filtering by [[IP address]] or [[port number]] alone, however this greater protection comes at the cost of increased computing on the web server.

== Overview ==

A PIDS will monitor the dynamic behavior and state of the protocol and will typically consists of a system or agent

that would typically sit at the front end of a server, monitoring and analysing the communication protocol between a connected device (a user/PC or system) and the system it is protecting.

Where HTTPS is in use then this system would need to reside in the "shim" or interface between where HTTPS is [[Cryptography|un-encrypted]] and immediately prior to it entering the Web [[presentation layer]].

A typical place for a PIDS would at the front end of a web server monitoring the HTTP (or HTTPS) protocol stream and would understand the HTTP protocol relative to the web server/system it is trying to protect.

=== Monitoring dynamic behavior ===

Where HTTPS is in use then this system would need to reside in the "shim" or interface between where HTTPS is un-encrypted and immediately prior to it entering the Web presentation layer.

AsAt a basic level a PIDS would look for, and enforce, the correct (legal) use of the protocol.

At a more advanced level the PIDS can learn or be taught acceptable constrictsconstructs of the protocol, and thus better detect anomolousanomalous behaviourbehavior.

=== Monitoring dynamic behavior ===

As a basic level PIDS would look for, and enforce the correct (legal) use of the protocol.

At a more advanced level the PIDS can learn or be taught acceptable constricts of the protocol, and thus better detect anomolous behaviour.

==See also==

* [[IntrusionApplication protocol-based intrusion detection system]] (APIDS)

* [[networkHost-based intrusion detection system|Network Intrusion Detection System]] (HIDS)

* [[Host-based intrusionIntrusion detection system]] (IDS)

* [[application protocol-basedNetwork intrusion detection system|Application Protocol-based Intrusion Detection System]] (NIDS)

* [[Tripwire (software)]] -– a pioneering HIDS

* [[Trusted Computing Group]]

* [[Trusted platform module]]

==References==

[[Category:Security software]]

{{Reflist}}

[[Category:System administration]]

{{DEFAULTSORT:Protocol-Based Intrusion Detection System}}

[[Category:Intrusion detection systems]]

[[Category:SecurityWeb server management software]]

[[es:PIDS]]