The Demonstration is for EDUCATIONAL PURPOSE ONLY!!! John the Ripper is a fast password cracker that is available for Unix, Windows, DOS, and OpenVMS. John the Ripper can and will detect weak Unix passwords. That was the original purpose of the application from the start where it was very successful. There is no pro versions available for Mac OSX & Linux with 64 Bit and wider range of password support. This can be downloaded here: http://www.openwall.com/john/ John the Ripper is available for Mac here http://www.openwall.com/john/pro/macosx/ Brute Force attacks may have a dictionary of all words or a listing of commonly used passwords. It is basically known as the trial and error method. Brute Force attacks use all possible combinations of legal characters in sequence. This attack is considered to be an infallible approach, but yet very time-consuming. The cracking of a password with this approach could take seconds, minuets, hours, or days. Bottom line it can take a lifetime. YouTube VideoWatch this video on YouTube.