To crack WPA/WPA2 pre-shared key. you need a dictionary of words as input. Basically, aircrack-ng takes each word and tests to see if this is in fact the pre-shared key.
There is a small wordlist that comes with aircrack-ng – “password.lst”.
The first easiest way is do an Internet search for word lists and dictionaries or check out web sites for password cracking tools.
Creating wordlists with crunch v3.0
crunch is now available in the lastest BT repositories.
so can download and install on backtrack5 simply by doing a :
apt-get install crunc
crunch is not installed by default on BT5 so you will need to download it from http://sourceforge.net/projects/crunch-wordlist/
and install as follows: ( copy the unzipped file to backtrack and put in the BT folder not in desktop)
Basic usage is as follows to print to screen ./crunch [min length] [max length] [character set] [options]
To write to file use the -o switch ; ./crunch [min length] [max length] [character set] [options] -o filename.txt
Example : ./crunch 6 6 0123456789ABCDEF -0 TEST.txt
More info and code here ”A day with TAPE“