Good info, Hawaii. Here is the actual link:

http://maemo.org/packages/view/kismet-plugin-ptw/

"Wireless 802.11b monitoring tool - Plugin PTW

Kismet is a 802.11b wireless network sniffer. It is capable of sniffing using almost any supported wireless card using the Airo, HostAP, Wlan-NG, and Orinoco (with a kernel patch) drivers.

Kismet is a command-line only program and so should be used inside X Terminal.

WARNING: This plugin can cause heavy load.

Kismet-PTW is a Kismet plugin which performs the Aircrack-NG PTW attack against data captured by Kismet.

The Aircrack-NG PTW attack exploits flaws in WEP to expose the original keystream. Because the PTW attack needs relatively few packets (50,000 to 100,000) and is relatively CPU cheap, it makes sense to include this as an automatic feature.

While Aircrack-NG can use injection to accelerate the rate at which packets are generated, increasing the chances of deriving the key, the Kismet-PTW version is 100% passive. Kismet will NOT inject packets or actively attack a network, with this plugin it will simply examine the data it has already recorded.

The code for the PTW attack is directly extracted from Aircrack-NG, this plugin simply wraps the Aircrack-NG library into a form Kismet can use directly. For complete info about the PTW attack or Aircrack, see the Aircrack-NG project at: http://www.aircrack-ng.org"