John the Ripper is the name of the password cracker tool that is developed by Openwall. In this blog, I have shown what is John the Ripper, How to use John the Ripper, How John the Ripper password cracker works and practical tutorial on John the Ripper usage. John the Ripper is the tool that is used by most of the ethical hackers to perform dictionary attacks for password cracking. This is the blog where you will see one of the most famous and powerful tool for password cracking which is John the Ripper.