Follow The Steps
1. Boot your system with a backtrack 5 live dvd ora
pendrive.
2. Goto Backtrack > Exploitation Tools > Wireless
Exploitation Tools > WLAN Exploitation > fern-
wifi-cracker
3. This is will open a fern wifi cracker window. Now
the First step is to select the interface. Here in
my case i have selected wlan0 interface .
4. To scan for Access Point click on the 2nd button
( wifi icon ). Once you get the Access Point
,various AP’s of WEP and WPA are detected. Fern
wifi cracking Now I am going to crack the WEP
Encryption . In my case , i have selected one Access
Point and click on the Attack button. Access Points
fern wifi cracking Once you click on the Attack
button , it will start collecting packets. attack
collect packer WEP KEY FOUND Once your IVS Packet
count reaches 10000 or greater than that , its
automatically crack the key and display it on the
screen . Password Found KEY DATABASE To see the
database , click on the Key Database button . WPA
CRACKING : For WPA cracking the steps are same
except you just need to specify the dictionary file
(a file containing list of passwords) for the
attack. Enjoy.