JTR is free and open-source software that's wide employed by hackers for password cracking. It uses the varied cryptanalytics attacks like "Dictionary Attack" and "Brute-Force Attack". It additionally comes with the business version moreover, i.e., "John the Ripper Professional." It's a lot of accessible versions providing a lot of practicality in password cracking at the enterprise level.
John the Ripper working:
-Initially get the hashed password that needs to be crack.
-We need to possess a wordlist of expected passwords in our system because it makes the password cracking job easier.
-Next, we tend to enter the valid John the ripper command that is used in extracting the password from the hash password given as an input.
The rate at which the password is going to be cracked depends utterly on the password's strength and offered wordlist. It keeps attempting to break the password continuously till the termination command isn't given.
(Links):
https://www.openwall.com/john/
