BY SUJEET KUMAR AS A CODDER
Aircrack-ng
Kali Linux can be used for many things, but it probably is best known for its ability to penetration test, or “hack,” WPA and WPA2 networks. There are hundreds of Windows applications that claim they can hack WPA; don’t get them! They’re just scams, used by professional hackers, to lure newbie or wannabe hackers into getting hacked themselves. There is only one way that hackers get into your network, and that is with a Linux-based OS, a wireless card capable of monitor mode, and aircrack-ng or similar. Also note that, even with these tools, Wi-Fi cracking is not for beginners. Playing with it requires basic knowledge of how WPA authentication works, and moderate familiarity with Kali Linux and its tools. If you feel you have the necessary skills, let’s begin:
Start Kali Linux and login, preferably as root.
Step Two:
Plugin your injection-capable wireless adapter, (Unless your native computer wireless card supports it). If you’re using Kali in VMware, then you might have to connect the card via the 
icon in the device menu.
icon in the device menu.
Step Three:
Disconnect from all wireless networks, o
This will list all of the wireless cards that support monitor (not injection) mode. If no cards are listed, try disconnecting and reconnecting the adapter (if you’re using one) and check that it supports monitor mode. If you’re not using an external adapter, and you still don’t see anything listed, then your card doesn’t support monitor mode, and you’ll have to purchase an external one (see the link in the requirements). You can see here that my card supports monitor mode and that it’s listed as wlan0.
Step Four:
Type airmon-ng start followed by the interface name of your wireless card. mine is wlan0, so my command would be: airmon-ng start wlan0
The “(monitor mode enabled)” message means that the card has successfully been put into monitor mode. Note the name of the new monitor interface, mon0.
