If you are a pen-tester, cracking passwords is something you will be doing on a daily basis. This can include login passwords, file passwords, and almost anything that is protected using a password. John the Ripper (JtR) is a popular password-cracking tool. John supports many encryption technologies for Windows and

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John the Ripper (JtR) is a popular password-cracking tool. John supports many encryption technologies for Windows and Unix systems (Mac included) John can autodetect the encryption for common formats. It works with a dictionary of common passwords to compare it with the hash in hand.

How to Crack Passwords using John The Ripper – Pentesting Tutorial