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Intrusion Detection
We have thousands of posts on a wide variety of open source and security topics, conveniently organized for searching or just browsing.

Building an In-Depth Defense  11 July 2001 
Source: Network Computing - Posted by Dave Wreski   
Enabling access to critical applications and data while maintaining the confidentiality, integrity and availability of these resources can be a daunting task. One of the first steps to completing it is to use network segmentation and access-control methodologies. . . .
Trojan Ports List  11 July 2001 
Source: Neohapsis - Posted by Dave Wreski   
The guys at Neohapsis have put together a list of ports on which trojans run. Greg Shipley writes, "One of our guys (Mike Janowski) put together a pretty comprehensive list of common UDP/TCP port numbers, including many common apps, and some not-so-common ones (i.e. video games, trojans, etc.). . .
Snort FAQ Updated  10 July 2001 
Posted by Dave Wreski   
Hot on the heels of the Snort-1.8 release, Dragos Ruiu has updated his FAQ for the snort network intrusion detection system. Be sure to see our Network Intrusion Detection Using Snort feature story covering installing, configuring and using snort on your network.. . .
Snort Version 1.8 Release  10 July 2001 
Source: - Posted by Ryan W. Maple   
Snort is a lightweight network intrusion detection system, capable of performing real-time traffic analysis and packet logging on IP networks. It can perform protocol analysis, content searching/matching and can be used to detect a variety of attacks . . .
Getting started in computer forensics  10 July 2001 
Source: Computer World - Posted by Dave Wreski   
Many private companies are turning to the military and law enforcement agencies to find computer forensics and security professionals. Some officers are leaving their posts for jobs in the corporate world, sometimes doubling or even tripling their salaries. That's what Jose . . .
Intrusion Detection Systems Terminology, Part One: A - H  05 July 2001 
Source: Security Focus - Posted by Benjamin D. Thomas   
Intrusion Detection Systems (IDS) are still very much in their infancy, but in terms of development they are growing at an extraordinary rate. The terminology associated with IDS is also growing at rapidly. This article is intended to introduce readers to . . .
How to stop a service denial attack before it stops you  04 July 2001 
Source: GCN - Posted by Dave Wreski   
It's not easy to defend a federal Web server against distributed service denial attacks, but it?s not impossible either. For years now, the government has been under the gun in an undeclared cyberwar with hackers around the globe. The simplest and . . .
Stemming the DoS flood  02 July 2001 
Source: ZDNet - Posted by Pete O'Hara   
One the most aggravating Internet security threats today is a distributed denial-of-service attack--a flood of bogus network traffic that can effectively shut down a Web site. Far from going away, the phenomenon is evolving in different permutations. But new tools are . . .
Introduction to Network-Based Intrusion Detection Systems Using Snort  28 June 2001 
Source: UnixReview - Posted by Dave Wreski   
This article will provide a basic overview of today's ID systems. It doesn't aim to be complete but gives a good starting point for further information. I will talk about different architecture approaches for ID systems, host and network based, to improve overall security for your business.. . .
Eliminating IDS Babble  28 June 2001 
Source: InfoSec Magazine - Posted by Jen Olson   
Simply put, there are as many different IDS applications as there are attack vectors (figuratively speaking, of course). As many organizations have discovered, multiple IDS solutions are needed to monitor different platforms and networks. This diversity inhibits enterprise-wide pooling and correlation . . .
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