Free aircrack software for linux

Aircrack-ng is a set of tools for auditing wireless networks.
- airodump: 802.11 packet capture program
- aireplay: 802.11 packet injection program
- aircrack: static WEP and WPA-PSK key cracker
- airdecap: decrypts WEP/WPA capture files
Aircrack-ng is the next generation of aircrack with lots of new features.
How do I crack a static WEP key ?
The basic idea is to capture as much encrypted traffic as possible using airodump. Each WEP data packet has an associated 3-byte Initialization Vector (IV): after a sufficient number of data packets have been collected, run aircrack on the resulting capture file. aircrack will then perform a set of statistical attacks developped by a talented hacker named KoreK.
How do I know my WEP key is correct ?
There are two authentication modes for WEP:
Open-System Authentication: this is the default mode. All clients are accepted by the AP, and the key is never checked: association is always granted. However if your key is incorrect you wont be able to receive or send packets (because decryption will fail), so DHCP, ping etc. will timeout.
Shared-Key Authentication: the client has to encrypt a challenge before association is granted by the AP. This mode is flawed and leads to keystream recovery, so its never enabled by default.
In summary, just because you seem to have successfully connected to the access point doesnt mean your WEP key is correct ! To check your WEP key, try to decrypt a capture file with the airdecap program.
How many IVs are required to crack WEP ?
WEP cracking is not an exact science. The number of required IVs depends on the WEP key length, and it also depends on your luck. Usually, 40-bit WEP can be cracked with 300.000 IVs, and 104-bit WEP can be cracked with 1.000.000 IVs; if youre out of luck you may need two million IVs, or more.
Theres no way to know the WEP key length: this information is kept hidden and never announced, either in management or data packets; as a consequence, airodump can not report the WEP key length. Thus, it is recommended to run aircrack twice: when you have 250.000 IVs, start aircrack with "-n 64" to crack 40-bit WEP. Then if the key isnt found, restart aircrack (without the -n option) to crack 104-bit WEP.
Enhancements:
- This release adds an ACX injection patch, and updates the rtl8187 patch for 2.6.21.
- It fixes madwifi-ng detection with airmon-ng.
- It fixes 2 bugs in aircrack-ng related to WPA cracking.
- It fixes an old Debian bug (#417388).
- It fixes the use of wlanng, and fixes IP address writing in the CSV file with airodump-ng.
- It fixes a bug in the GUI for Windows and adds a PTW option.

The Auditor security collection is a Live-System based on KNOPPIX. With no installation whatsoever, the analysis platform is started directly from the CD-Rom and is fully accessible within minutes.
Independent of the hardware in use, the Auditor security collection offers a standardised working environment, so that the build-up of know-how and remote support is made easier. Even during the planning and development stages, our target was to achieve an excellent user-friendliness combined with an optimal toolset.
Professional open-source programs offer you a complete toolset to analyse your safety, byte for byte. In order to become quickly proficient within the Auditor security collection, the menu structure is supported by recognised phases of a security check. (Foot-printing, analysis, scanning, wireless, brute-forcing, cracking).
By this means, you instinctively find the right tool for the appropriate task. In addition to the approx. 300 tools, the Auditor security collection contains further background information regarding the standard configuration and passwords, as well as word lists from many different areas and languages with approx. 64 million entries.
Current productivity tools such as web browser, editors and graphic tools allow you to create or edit texts and pictures for reports, directly within the Auditor security platform. Many tools were adapted, newly developed or converted from other system platforms, in order to make as many current auditing tools available as possible on one CD-ROM.
Tools like Wellenreiter and Kismet were equipped with an automatic hardware identification, thus avoiding irritating and annoying configuration of the wireless cards.
Enhancements:
New & Updated tools:
- proxychains 1-8-1 (for example scanning over proxy more easy)
- yersinia-0.5.4
- kismet-logfile-viewer klv.pl and klc.pl
- ntp fingerprinting tool
- tftp bruteforce tool
- snmp fuzzer
- cisco torch 0.4b
- unicornscan 0.4.2
- packit
- sendip
- nasl 2.2.4
- tcpick
- cryptcat
- amap version 4.8
- tcpsplit
- Ethereal version 10.11
- ettercap-ng-0.72 and modified the etter.conf
- replaced tinysnmp with snmp tools
- vnc2swf /usr/X11R6/bin/recordwin and vnc2swf
- edit_vnc2swf.py
- edit_mp3.py
- wpa-supplicatiant 0.3.8
- hostapd-utils 0.3.7
- ssldump
- fragrouter
- Metasploit 2.4 including all known updates
- airsnarf, but no menu at moment
- fakeap to /opt/auditor but no menu entry at moment, need to write a shell script
- dsniff 2.4b1-10
- nessus plugins updated
- exploit tree updated
- Snort 2.3.2-5
- Bleeding-edge rules for snort
- New aircrack
- New airsnort
- Bet i forgot some to mention.
New & updated drivers:
- rt2400 linux drivers and utils (untested)
- rtl8180 driver (8180_26_private.ko and open8180.ko and /usr/local/bin/wlanup and /usr/local/bin/wlandown) (Untested)
- hostap drivers 0.3.7
- ipw2100 & ipw2200 incl firmware, incl monitor mode
- Prism54 with injection patch
- Linux-wlan-ng with injection patch
- Madwifi with injection patch
- ACX drivers are back on cd
Addons:
- Default password list has been updated
- Added some changes to the network stack using /etc/sysctl.conf, which will be called from knoppix-autoconfig script
- New background image
Some fixes i remember:
- Kernel completely rebuilded to provide full functionality
- Isolinux now accepts bootparameters again
- USB drivers are back to /dev/sda and booting from stick works fine
- grub files have been fixed
- fixed hostname /etc/hosts
- /cdrom/index.html pointed to the old forum fixed that
- Added cardctl eject, cardctl insert into switch-to-XY scripts
- Fixed the homebutton of the konquerror when clicked first time
- Fixed the menuentry for nessus