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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.

Luring Killer Bees With Honey  13 February 2001 
Source: NetworkComputing - Posted by Dave Wreski   
This August 2000 article describes honeypots, the legal aspects, and how to integrate it into your network. "According to the general definition, a honey pot's goal is to emulate production servers while alerting and logging intruder activity. How it should achieve . . .
Intrusion Detection Systems, Part IV: Logcheck  13 February 2001 
Source: FreeOS - Posted by Jen Olson   
The last in this four part series on IDS, looks at Logcheck: a software package that is designed to automatically run and check system log files for security violations and unusual activity. In the last three articles in this series, . . .
Traffic analysis almost for free, part 2  08 February 2001 
Source: ZDNet - Posted by Benjamin D. Thomas   
IPtraf is a console-based network monitoring utility for Linux (the latest version, 2.3.1, is available for download). Written by Gerard Paul Riker, IPtraf tops my list of easy-to use-network analysis tools. IPtraf is distributed in a compressed tar format, and . . .
Penetration Testing Exposed  08 February 2001 
Source: InfoSecurity Magazine - Posted by Dave Wreski   
Part three of our series on "Audits, Assessments & Tests (Oh, My)" explores penetration testing, the controversial practice of simulating real-world attacks by discovering and exploiting system vulnerabilities. We are routinely deluged with news reports detailing the exploits of attackers who . . .
Attacking DoS Attacks  06 February 2001 
Source: TechWeb - Posted by Dave Wreski   
To combat such attacks on routers, a new company called Arbor Networks Inc.-funded by Cisco Systems Inc. (stock: CSCO) and Intel Corp. (stock: INTC)-this week will launch a managed availability service that aims to detect, trace, and block DoS attacks.. . .
RazorBack v0.1 - SNORT Intrusion Detection Front-End  06 February 2001 
Source: InterSect - Posted by Dave Wreski   
RazorBack is a log analysis program that interfaces with the SNORT open source Intrusion Detection System to provide real time visual notification when an intrusion signature has been detected on the network. RazorBack is designed to work within the GNOME 1.2 . . .
ECN and it's impact on Intrusion Detection  12 January 2001 
Source: SANS / Toby Miller - Posted by Ryan W. Maple   
Recently, there has been some discussion on various mailing list(s) about the Explicit Congestion Notification (ECN) proposed standard and QUESO/nmap scan detection. The debate has been centered around the two reserve bits in the TCP header (bits 8 & 9) that . . .
Snort 1.7 Released  06 January 2001 
Source: - Posted by Dave Wreski   
Snort 1.7 has finally been released! Snort is an open source network intrusion detection system, capable of performing real-time traffic analysis and packet logging on IP networks. It can perform protocol analysis, content . . .
Intrusion Detection: Be Afraid, Be Very Afraid  04 January 2001 
Source: TechWeb - Posted by Benjamin D. Thomas   
If you're not afraid about the state of your company's security, you should be. Hackers are scanning ports en masse, coordinated attacks are gaining popularity, and network users who appear to be valid are often impostors. And that's just outside attacks. . . .
IDS Evasion with Unicode  04 January 2001 
Source: Security Focus - Posted by Benjamin D. Thomas   
A thief obtains his prize by bypassing alarms and security systems that are in place. IDS evasion is no different. An attacker knows that the IDS will alarm on certain attack signatures and, therefore, will try to evade the IDS by . . .
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