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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.

The Trouble With Tripwire: Making a Valuable Security Tool More Efficient  06 June 2001 
Source: SecurityFocus - Posted by Derrick Lewis   
If an attack against a system is detected, how can it be determined that a system has actually been compromised and important files removed or altered? One answer is to always run Tripwire. Unfortunately, due to the volume and frequency of . . .
Forensic Analysis of the GRC DDoS Attack  05 June 2001 
Source: - Posted by Dave Wreski   
Steve Gibson recounts the steps he took to stop his attack from being subjected to a distributed denial of service attack. "I believe you will be as fascinated and concerned as I am by the findings of my post-attack forensic analysis, and the results of my subsequent infiltration into the networks and technologies being used by some of the Internet's most active hackers.". . .
Hacking Into Wall Street  30 May 2001 
Source: TechTV - Posted by Derrick Lewis   
A Wall Street brokerage finds out that trusting its own employees isn't always a safe bet. On March 10, 2000, the Nasdaq reached an all-time high, breaking the 5000 mark for the very first time. Internet Trading Technologies (ITTI) wasn't participating . . .
DoS attack disables Net security watchdog  23 May 2001 
Source: ZDNet - Posted by Pete O'Hara   
Unknown attackers inundated the Computer Emergency Response Team Coordination Center with data Tuesday and Wednesday, cutting off the public's access to the organization largely responsible for warning others on the Internet about computer-security threats. The attack began around 9 a.m. PDT . . .
UC San Diego Researchers Analyze Prevalence, Patterns of Worldwide Denial-of-Service Attacks on Inte  22 May 2001 
Source: Symantec - Posted by Ryan W. Maple   
Using a new technique, University of California, San Diego network researchers from the San Diego Supercomputer Center [SDSC] and the Jacobs School of Engineering have analyzed the worldwide pattern of malicious denial-of-service [DoS] attacks against the computers of . . .
Intrusion-Detection Systems by the Numbers  21 May 2001 
Source: ComputerWorld - Posted by Dave Wreski   
My company recently tested and acquired a network-based intrusion-detection system (IDS). Over the past few months, I've received many e-mails from readers asking me to explain the performance-testing methodology I used, so I've decided to share how I tested our network-based IDS.. . .
Sniffing Out Packet Sniffers  15 May 2001 
Source: Earthweb - Posted by Dave Wreski   
One of the oldest methods of stealing information off of a network is through packet sniffing. In case you aren't familiar with the term, packet sniffing refers to the technique of copying each packet as it flows across the network. While . . .
Linux "0wn this box" Challenge  01 May 2001 
Source: Cylant Technologies - Posted by Dave Wreski   
Cylant Technology announces its "0wn this box" challenge. As a demonstration of its behavioral analysis approach to the field of security, Cylant invites hackers and crackers alike to attempt a root compromise of The first person to successfully "0wn" victim will have the server shipped to them. . . .
Digital detectives track hacks  25 April 2001 
Source: ZDNet / eWeek - Posted by Nick DeClario   
If e-business had a modern-day Sherlock Holmes, his name would be David Dittrich. Dittrich, a security manager at the University of Washington, in Seattle, is one of a rare breed of security pros-the computer forensics expert-whose skills are getting ever more . . .
Scanning Your Network  23 April 2001 
Source: O'Reilly / OnLamp - Posted by Nick DeClario   
This document covers examining ICMP packets, IP packets revealed, Capturing TCP Packets, TCP Protocol Layers, and Understanding Filesystem Inodes on a FreeBSD system. "In the next few articles, I'd like to demonstrate putting some of this knowledge together in order to . . .
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