Aircrack-ng is an 802.11 WEP and WPA-PSK keys cracking program that can recover keys once enough data packets have been captured. It implements the standard FMS attack along with some optimizations like KoreK attacks, as well as the all-new PTW attack, thus making the attack much faster compared to other WEP cracking tools. In fact, Aircrack-ng is a set of tools for auditing wireless networks.

What is Aircrack-ng ?

Aircrack-ng is the next generation of aircrack with lots of new features:

• Better documentation (wiki, manpages) and support (Forum, trac, IRC: #aircrack-ng on Freenode).
• More cards/drivers supported
• More OS and platforms supported
• New WEP attack: PTW
• WEP dictionary attack
• Fragmentation attack
• Improved cracking speed
• Capture with multiple cards
• New tools: airtun-ng, packetforge-ng (improved arpforge), wesside-ng, easside-ng, airserv-ng, airolib-ng, airdriver-ng, airbase-ng,tkiptun-ng and airdecloak-ng
• Optimizations, other improvements and bug fixing

Download

http://aircrack-ng.org/doku.php#download

Installing on Windows

The Windows version of the aircrack-ng suite does not have an install program. You must manually install (unzipping archive) the software.

Here are the steps to follow for Windows XP:

• Download the latest version of the aircrack-ng suite for Windows to your PC. The link for the zip file can be found on theWiki home page.

• Unzip the contents of the aircrack-ng zip file into �C:\�. This will create a directory called �aircrack-ng-0.9.3-win�. This directory name will vary based on the exact version that you downloaded. This main directory contains three subdirectories - �bin�, �src� and �test�.

Prior to using the software, make sure to install the drivers for your particular wireless card. See this link for the instructions.

To now use the aircrack-ng suite, start Windows Explorer and double click on Aircrack-ng GUI.exe inside �bin� subdirectory. The GUIrequires .NET Framework 2.0 to run (.NET Frameworks 1.0/1.1 are not able to run this executable, 2.0 or better MUST be installed).

Alternatively, open a command prompt (Start menu ? Execute ? cmd.exe) and change to the �C:\aircrack-ng-0.9-win\bin� directory and execute the individual commands. 


Important notes:

• Remember that Windows only supports a limited subset of the commands.

Via: http://aircrack-ng.org