You should only crack a wifi password for education purposes and only wifi networks which you have permission from the owner to do so.
Method 1 - Keychain Recovery
If you have already had a network password typed into your Mac and but the person did not tell you what it was you can recover the password.
Go to Application > Utilities > Keychain Access.app
At the top look for the name of your network.
Double click the network and click "Show Password"
Enter Admin password if needed (Your Mac's password not the wifi's)
ANDDDDD You've done it! The password should be shown!
Method 2 - KisMac
KisMac scans data from all surrounding wifi networks and obtains packets from them. Once enough packets are obtained than you can simply get the wifi password.
Video tutorial is less vague
Wpa / Wep
Start KisMac > Preferences > Driver > Add Airport Extreme Active & Passive Modes
Start Scan
Once you have collected a little over half a million packets try to crack via provided tools in Channel & Network.
Method 3 - BackTrack
( Does not work on PPC Macs )
( Does not work on PPC Macs )
Install [ Hardware ] ( Windows and Mac)
Cracking Tutorial Videos:
Feel free to post any methods not in the post in the comments.
Wordlist Links:
http://pastebin.com/S4fD0JsT
Best Wifi Card for Cracking , Allows you to re-inject packets which you can't do with airport :

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ReplyDeleteAs it just so happens, Kismac was hosted in Germany. If you still need Kismac for whatever reason it can still be found on the wayback machine here:
https://web.archive.org/web/20140915052222/http://trac.kismac-ng.org/wiki/Downloads