It can be run against various encrypted password formats including several crypt password hash types commonly found in Linux or Windows. It is one of the most popular password testings and breaking programs as it combines a number of password crackers into one package, autodetects password hash types, and includes a customizable cracker. Originally developed for Unix Operating Systems but later on developed for other platforms as well. John the Ripper is a free password cracking software tool developed by Openwall.
In this article, we are introducing John the ripper and its various usage for beginners. We know the importance of John the ripper in penetration testing, as it is quite popular among password cracking tool.