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Linux is the best platform to do this job, of course u can hack a WIFI under windows as well, in that case u need to install a modded driver for your NIC to open monitor feature.

Tool:

aircrack-ng Platform: Linux 2.6.27 Hardware: Intel 2200BG Wireless network adapter

Installation:

1. Make sure your wireless network card works well on linux. If u have questions, please visit wiki of your linux distro.
2. Install aircrack-ng pack. U can simply do this through your package manager

• For ArchLinux user:  pacman -S aircrack-ng
• For debian & ubuntu: apt-get install aircrack-ng

• For fedora: First add this repository Dag Wieers or Dries, then yum -y install aircrack-ng

Data Capture:

1. Open the monitor function of your NIC through this command: airmon-ng start <interface>. then it should look like this:
2. Start to capture data steam, airodump-ng <interface>
3. Wait for a while, untill some APs and  associated clients show up. Then u can choose a target to hack
4. Type this command to capture data between your target AP and associated client, airodump-ng  –bssid xx:xx:xx:xx:xx:xx -w dump <interface>

Cracking:

1. When you think you have collected enough packet(usually the size of dump.cap should be between 40k to 85k). U can start to crack by this simple command: aircrack-ng -b xx:xx:xx:xx:xx:xx dump-01.cap                                 The MAC after the -b option is the BSSID of the target and dump-01.cap the file containing the captured packets. You can use multiple files, just add all their names or you can use a wildcard such as dump*.cap.
2. Just wait & enjoy

Linux