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Aircrack-ng for Windows - Aircrack:

Project Homepage: http://www.aircrack-ng.org/index.php?title=Main_Page

Aircrack-ng is the next generation of Christophe Devine's excellent aircrack suite of tools. 

INSTALLING AIRCRACK-NG FOR WINDOWS

USING AIRDECAP-NG

DECRYPTING WEP

DECRYPTING WPA

FILTERING

airdecap is a tool for decrypting WEP and WPA capture files.  This can be useful if we which to confirm a WEP or WPA key that we have acquired using one of the WEP or WPA cracking programs.

Using airdecap-ng:

Decrypting WEP encrypted captures:

To decrypt a WEP capture "capture3.cap" we specify the WEP key with the -w switch.

airdecap -w  8ECC280C4AAC49B7716B78530D  capture3.cap

The file capture3-dec.cap is automatically created which is an unencrypted version of our capture file.  This file is a standard pcap file and can be viewed in ethereal.

Decrypting WPA encrypted captures:

Because WPA encryption not only make use of a pass-phrase but also salts the process with the network SSID we are required to supply both the SSID and WPA pass-phrase.

airdecap -e test -p biscotte wpa.cap

In the above example (which can be obtained from the test directory within the aircrack-ng download) test is the network SSID for our capture file (wpa.cap) and biscotte is the WPA pass-phrase.

The file wpa-dec.cap is automatically created which is an unencrypted version of our capture file.  This file is a standard pcap file and can be viewed in ethereal.

Filtering:

Using the -b switch (BSSID) we can specify which BSSID to decrypt with airdecap.  Handy if our capture file contains the traffic from several different networks.