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coWPAtty for Windows MAIN:


"coWPAtty is designed to audit the pre-shared key (PSK) selection for WPA networks based on the TKIP protocol." - Joshua Wright.

Project Homepage:



Local Mirror:  MD5: aa9ead2aacfcc493da3684351425d4c6



coWPAtty Dictionary Attack


Precomputing WPA PMK to crack WPA PSK


coWPAtty Precomputed WPA Attack


coWPAtty Recomputed WPA2 Attack


coWPAtty Tables



coWPAtty Usage:




coWPAtty Dictionary Attack:


To perform the coWPAtty dictionary attack we need to supply the tool with a capture file that includes the TKIP four-way handshake, a dictionary file of passphrases to guess with and the SSID for the network.


In order to collect the four-way handshake you can either wait until a client joins the network or preferably you can force it to rejoin the network using tools like void11 or aireplay and capture the handshakes using something like kismet, ethereal or airodump.


cowpatty -f dict -r wpapsk-linksys.dump  -s linksys





As you can see this simple dictionary attack took 51 seconds, we can speed up this process by precomputing the WPA-PMK to crack the WPA-PSK (see below).


wpapsk-linksys.dump is the capture containing the four-way handshake


dict is the password file


linksys is the network SSID



Precomputing WPA PMK to crack WPA PSK:


genpmk is used to precompute the hash files in a similar way to Rainbow tables is used to pre-hash passwords in Windows LANMan attacks.  There is a slight difference however in WPA in that the SSID of the network is used as well as the WPA-PSK to "salt" the hash.  This means that we need a different set of hashes for each and every unique SSID i.e. a set for "linksys" a set for "tsunami" etc.



So to generate some hash files for a network using the SSID cuckoo we use:



genpmk  -f  dict  -d linksys.hashfile  -s linksys 





dict is the password file


linksys.hashfile is our output file


linksys is the network ESSID



coWPAtty Precomputed WPA Attack:


Now we have created our hash file we can use it against any WPA-PSK network that is utilising a network SSID of cuckoo.  Remember the capture (wpa-test-01.cap) must contain the four-way handshake to be successful.



cowpatty  -d linksys.hashfile -r wpapsk-linksys.dump  -s linksys 




wpa-test-01.cap is the capture containing the four-way handshake


linksys.hashfile are our precomputed hashes


linksys is the network ESSID



Notice that cracking the WPA-PSK took 0.04 seconds with the pre-computed attacked as opposed to 200 seconds with standard dictionary attack mode, albeit you do need to pre-compute the hash files prior to the attack.  However, precomputing large hash files for common SSIDS (e.g. linksys, tsunami) would be a sensible move for most penetration testers.



coWPAtty Precomputed WPA2 Attack:


coWPAtty 4.0 is also capable of attacking WPA2 captures.  Note: The same hash file as was used with the WPA capture was also used with the WPA2 capture.


cowpatty  -d linksys.hashfile -r wpa2psk-linksys.dump  -s linksys




wpa2psk-linksys.dump is the capture containing the four-way handshake


dict is the password file


linksys is the network SSID



coWPAtty Tables:


The Church of Wifi have produced some lookup tables for 1000 SSID's computed against a 170,000 word password file.  The resultant table are approximately 7 Gigabytes in size and can be downloaded via Torrent:


A 33 Gigabyte set of tables are also available:


Or you can buy them via DVD, direct from Renderman (initiator of the project):


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