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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.

DoS Attacks: Easier To Launch, Harder to Fight  07 November 2001 
Source: osOpinion - Posted by Jen Olson   
DoS attackers are relying more on automated tools, which lower the level of technical knowledge necessary to launch a successful attack. Experts are warning that crippling denial of service (DoS) attacks have become easier to launch, with automated tools and newer methods that tie up more computer and Internet resources than ever.. . .
Trojan programs improve attack methods  05 November 2001 
Source: vnunet - Posted by Jen Olson   
Security watchers have warned that Trojan programs, feared for their ability to compromise a network and go unnoticed, are getting sneakier about sending data out of the network. Typically, Trojans sit on a compromised machine and wait for incoming connections to deliver instructions.. . .
Nessus : another brick in the (security) wall  03 November 2001 
Source: LinuxFocus - Posted by Dave Wreski   
Nessus is a free security scanner available from The project was started and is maintained by Renaud Deraison. The stable version at the time of this writing is 1.09 and the experimental one is 1.14. The software is released under . . .
Hacker intrusion collusion creates 'perfect IDS'  03 November 2001 
Source: vnunet - Posted by Dave Wreski   
Three months after the infamous Def Con hacker fest back in July, a group of geeks have published data which they claim may prove to be the ultimate Intrusion Detection System (IDS) test bed.. . .
The art of Computer Forensics  01 November 2001 
Source: Lexis-Nexis - Posted by Benjamin D. Thomas   
When the perpetrator deletes files, or when pieces of a file are fragmented all over the place, hard disk/floppy disk examination is another technique that computer forensic scientists employ. Basically, this looks at all the bits on the magnetic media to . . .
Hacker intrusion collusion creates 'perfect IDS'  31 October 2001 
Source: VNUNet - Posted by Benjamin D. Thomas   
Three months after the infamous Def Con hacker fest back in July, a group of geeks have published data which they claim may prove to be the ultimate Intrusion Detection System (IDS) test bed. Each year the Def Con meeting . . .
Xprobe and Nmap Fingerprint Analysis  31 October 2001 
Source: Help Net Security - Posted by Benjamin D. Thomas   
I wrote the following to illustrate how easy it is for IDS to identify Nmap OS detection, and the difficulty in detecting Xprobe OS detection. While Xprobe would be my favorite OS detection tool, a lot of work needs . . .
Tripwire aims to lock down routers, switches  29 October 2001 
Source: ComputerWorld - Posted by Jen Olson   
Working from the idea that intruders can't do much lasting damage to your network if they can't make changes to files, Tripwire Inc. on Monday announced a new version of its security lockdown software, Tripwire for Routers and Switches. The product, . . .
Cybernarks - Who's hunting the Hackers?  27 October 2001 
Source: ZDNet - Posted by Benjamin D. Thomas   
Steven Lynch was first introduced to the joys of hunting down hackers in MIT in 1989. While working in the University's IT department he came across Australia's very own Leftist and Urvile, as they took control of the institutions servers and . . .
Intrusion Detection Systems for the Uninitiated, Part 2; Installing and Configuring Snort  26 October 2001 
Source: - Posted by Dave Wreski   
Snort is a lightweight network-based intrusion detection system (called NIDS). NIDS is unlike 'portsentry', which is a host based IDS and capable of performing real-time traffic analysis and packet logging on IP networks. The reason Snort is called 'lightweight' NIDS, is . . .
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