Aircrack-ng v0.6.1
from http://www.aircrack-ng.org
compiled September 2006

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

The Aircrack package consists of these utilities:

airmon-ng - script used to configure the wireless card.

airodump-ng - used for packet capturing of raw 802.11 frames, particularly suitable for collecting WEP IVs (initialization vectors) for the intent of using them with aircrack-ng.  Example usage:
airodump-ng --write /home/mycapture1 wlan0

aireplay-ng - used to inject frames.  The primary function is to generate traffic for the later use in aircrack-ng for cracking the WEP and WPA-PSK keys.

aircrack-ng - the 802.11 WEP and WPA-PSK keys cracking program that can recover this keys once enough encrypted packets have been captured with airodump.

airdecap-ng - decrypt WEP/WPA capture files.

arpforge-ng - tool to create arbitrary ARP request frames.

ivstools - handle .ivs files with this tool. You can either merge or convert them.

Run each utility with "--help" for more information.

Aircrack-ng will work with Linux drivers listed here -
http://www.aircrack-ng.org/doku.php?id=compatibility&DokuWiki=36a0a3400428abc523e1b5b618305730
Full compatibility, including packet injection with aireplay-ng, is possible with these drivers -

MADWiFi (Atheros)
HostAP (Prism2, but not USB)
Prism54-fullmac (PrismGT)
rt2x00 (Ralink, RT2500 PCI & RT2570 USB models only)
rtl8180-sa2400 (Realtek)

All of these drivers except rt2x00 required a patch to achieve this feature.