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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.

PortSentry for Attack Detection, Part One  16 May 2002 
Source: Securityfocus - Posted by Jen Olson   
Portsentry by Psionic Technologies is a component of their TriSentry suite of attack detection tools: portsentry, hostsentry, and logsentry. This article is the first of a two-part series that will describe in detail how Portsentry works from both a theoretical and a technical point of view.The second article will discuss installing, configuring, and tailoring PortSentry for individual systems.. . .
Security experts swarm to Honeynet challenge  09 May 2002 
Source: VNUNet - Posted by Benjamin D. Thomas   
Reverse engineering project to unravel binary caught in the wild The Honeynet Project, which has been monitoring black hat hacking activity over the past year, has set up a new challenge to help develop reverse engineering skills throughout the security community. . . .
New Way to Nab Hackers  07 May 2002 
Source: eWeek - Posted by Pete O'Hara   
As the threats to corporate networks continue to mount and attackers' methods evolve, security vendors are turning to technologies that detect not just what attackers are doing but how they're doing it. ... The thing to realize about anomaly detection is that it assumes anything 'unusual' is wrong. So that means that the majority of behavior must be 'usual' and predictable," said Gene Spafford, a professor of computer science at Purdue University. . .
Honeynet Project: The Reverse Challenge  02 May 2002 
Source: Honeynet Project - Posted by Dave Wreski   
The Reverse Challenge is an effort to allow incident handlers around the world to all look at the same binary -- a unique tool captured in the wild -- and to see who can dig the most out of that system and communicate what they've found in a concise manner.. . .
How to install PureSecure, the painless IDS  01 May 2002 
Source: LinuxWorld - Posted by Jen Olson   
There are more differences between ACID and PureSecure than just the license. PureSecure is much more polished, more complete, and more full-featured than its free software counterpart. The first major difference I noticed between PureSecure and ACID was the installation. The . . .
Network Forensics: Tapping the Internet  29 April 2002 
Source: O'Reilly Network - Posted by Dave Wreski   
Methods of archiving network data for forensic analysis. "Another approach to monitoring is to examine all of the traffic that moves over the network, but only record information deemed worthy of further analysis. The primary advantage of this approach is that computers can monitor far more information than they can archive -- memory is faster than disk.. . .
Building an IDS Solution Using Snort  29 April 2002 
Source: - Posted by Dave Wreski   
This document provides a step-by-step guide to building an intrusion detection system using open-source software. The process involves Installing RedHat Linux 7.1, Compiling/Installing and configuration of MySql/Apache/ACID/Snort, Setup of Snort rules f Hardening of Machine The document assumes a basic level understanding of linux and computer technologies.. . .
Evasion tool puts Snort's nose out of joint  17 April 2002 
Source: vnunet - Posted by Dave Wreski   
The darling of the intrusion detection system (IDS) industry had its nose put out of joint yesterday when a security developer released an evasion tool capable of undermining it. Open source development Snort has been heralded as one of the most flexible IDS offerings, comparing well with alternative commercial products.. . .
Monitoring reduces security risks  11 April 2002 
Source: The Register - Posted by Jen Olson   
Counterpane today released statistics to back its claim that customers of its monitoring services are far less likely to have their networks penetrated. In the first quarter of 2002, Counterpane monitored approx. 200 networks worldwide and processed 31 billion network . . .
How to detect intruders with ACID  11 April 2002 
Source: LinuxWorld - Posted by Jen Olson   
All it takes is time and free software to set up a powerful intrusion detection system for your Unix system. Follow along as Joe Barr installs ACID on his system and discovers a big security hole. I wanted to try ACID . . .
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