John the ripper
'John' is a known password cracking tool widely used by all penetration tester. It's easy to use and can be found on almost every linux distribution.
'John' supports a lot of parameters that will help you crack a password faster, just run $john
Below is a quick setup guide to install it on Fedora Linux with two easy steps :
> Now, you are ready to crack !
The lines below are from a shadow file (/etc/shadow) of a Linux system:
Each lines consists from 4 main parts :
> Let's crack the passwords !
As user run $ john /etc/shadow . In our example we use a shadow file that contains the above 2 hashes (alice & bob)