Knocker
Knocker is a simple and easy to use TCP security port scanner written in C to analyze hosts and all of the different services started on them.
Discover How To Harden My Filesystem HOWTOs
Kismet
Kismet is an 802.11 layer2 wireless network detector, sniffer, and intrusion detection system. Kismet will work with any wireless card which supports raw monitoring (rfmon) mode, and can sniff 802.11b, 802.11a, and 802.11g traffic.
John the Ripper password cracker
John the Ripper is a fast password cracker, currently available for many flavors of Unix (11 are officially supported, not counting different architectures), DOS, Win32, BeOS, and OpenVMS. Its primary purpose is to detect weak Unix passwords.
flawfinder
This is the main web site for flawfinder, a program that examines source code and reports possible security weaknesses (``flaws'') sorted by risk level. It's very useful for quickly finding and removing at least some potential security problems befor
ettercap
Ettercap is a suite for man in the middle attacks on LAN. It features sniffing of live connections, content filtering on the fly and many other interesting tricks. It supports active and passive dissection of many protocols (even ciphered ones) and
Beginner's guide to armoring Linux
Organizations throughout the world are adopting Linux as their production platform. By connecting to the Internet to provide critical services, they also become targets of opportunity. To help protect these Linux systems, this article covers the basi
