By Usama Azad John The Ripper is an open source and very efficient password cracker by Open-Wall. It was originally built for Unix but is now available for fifteen different platforms including Windows, DOS, BeOS, OpenVMS and Unix like operating systems. It is an Open Source tool and is free, though a premium version also exists. John the Ripper has an official free version, a community enhanced version, and also a pro version. In this tutorial, we will see the most common password cracking like Linux password, Zip file protected with a password, Windows password, and Wifi Handshake file cracking. John the Ripper Pro for Mac OS X features a native package (dmg), universal binary, support for SSE2 and AltiVec acceleration (on Intel and PowerPC, respectively), a large multilingual wordlist.

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Introduction

John the Ripper Pro is a free and open source password cracker tool for Mac computers.This tutorial will show you how to use John the Ripper to crack Windows 10, 8 and 7 password on. 8 and 7 Password with John the Ripper.

John the Ripper (JTR) is a widely known and verified fast password cracker, available for Windows, DOS, BeOS, and OpenVMS and many flavours of Linux. It uses wordlists/dictionary to crack many different types of hashes including MD5, SHA, etc.

John the Ripper: Fast Password Cracker

This password cracking tool is free and Open Source, initially developed for the Unix operating system. But today it runs on fifteen different platforms. Its primary purpose is to detect weak Unix passwords. Besides several crypt(3) password hash types most commonly found on various Unix systems, supported out of the box are Windows LM hashes, and a lot of other hashes and ciphers in the community-enhanced version.

For those who rather use commercial version, John the Ripper is available for following platforms:

Linux: John the Ripper Pro
Mac OS X: John the Ripper Pro
Windows: Hash Suite
Android: Hash Suite Droid

John the Ripper offers two types of attacks:

Dictionary: It takes text string samples from wordlist, which contains dictionary of real passwords that are cracked before, encrypting it in the same format as the password being examined (encryption algorithm/key), and comparing the output to the encrypted string. John can also perform word alterations.
Brute force: It goes through all the possible plaintexts, hashing each one and then comparing it to the input hash. This method takes a long time to run, but it’s precious for cracking password that doesn’t appear in wordlist dictionary.

Features/Performance

Feature-rich and fast password cracking tool, with several cracking modes.
It allows you to define a custom cracking mode using the built-in compiler supporting a subset of C.
You can use same cracker everywhere, since John is available for different platforms, with possibility to continue a cracking session started on another platform.
This tool supports a lot of Unix crypt(3) hash types:
- traditional DES-based,'bigcrypt',BSDI extended DES-based,FreeBSD MD5-based,OpenBSD Blowfish-based,Kerberos/AFS and Windows LM (DES-based),DES-based tripcodes.
On Linux distributions with glibc 2.7+, John 1.7.6+ supports SHA-crypt hashes, with optional OpenMP parallelization (requires GCC 4.2+).
On recent versions of Solaris, John 1.7.6+ supports and autodetects SHA-crypt and SunMD5 hashes, also with optional OpenMP parallelization (requires GCC 4.2+ or recent Sun Studio).
John the Ripper Pro adds support for Windows NTLM (MD4-based) and Mac OS X 10.4+ salted SHA-1 hashes.
“Community enhanced” -jumbo versions add support for many more password hash types:
- Windows NTLM (MD4-based), Mac OS X 10.4-10.6 salted SHA-1 hashes, Mac OS X 10.7 salted SHA-512 hashes, raw MD5 and SHA-1, arbitrary MD5-based “web application” password hash types, hashes used by SQL database servers (MySQL, MS SQL, Oracle) and by some LDAP servers, several hash types used on OpenVMS, password hashes of the Eggdrop IRC bot, and lots of other hash types, as well as many non-hashes such as OpenSSH private keys, S/Key skeykeys files, Kerberos TGTs, PDF files, ZIP (classic PKZIP and WinZip/AES) and RAR archives.
John the Ripper has its own highly optimized modules for different hash types and processor architectures.

John the Ripper’s Cracking Modes:

Wordlist mode
Single crack mode
Incremental mode
External mode

Install

Debian-based systems/Ubuntu

Clone it from the Github repository:

Then build:

To test your build, run:

Windows

Windows users can find detailed documentation on the official John the Ripper Wiki page.

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Usage

John The Ripper Pro

To run John, firstly supply it with some password files and if you wish, specify a cracking mode:

If you want to restrict it to the wordlist mode only (permitting the use of word mangling rules):

To retrieve the cracked passwords, run:

Interrupted session can be continued with the following:

Options

John the Ripper
Stable release
Running john with a password list on a shadow file
Developer(s)	OpenWall
Initial release	October 3, 2002
Repository
Operating system	Cross-platform
Type	Password cracking
License	GNU General Public License Proprietary (Pro version)
Website	www.openwall.com/john/

John the Ripper is a freepassword cracking software tool.^[2] Originally developed for the Unix operating system, it can run on fifteen different platforms (eleven of which are architecture-specific versions of Unix, DOS, Win32, BeOS, and OpenVMS). It is among the most frequently used password testing and breaking programs^[3] as it combines a number of password crackers into one package, autodetects password hash types, and includes a customizable cracker. It can be run against various encrypted password formats including several crypt password hash types most commonly found on various Unix versions (based on DES, MD5, or Blowfish), KerberosAFS, and Windows NT/2000/XP/2003 LM hash. Additional modules have extended its ability to include MD4-based password hashes and passwords stored in LDAP, MySQL, and others.^[4]

John The Ripper Program

Sample output[edit]

Here is a sample output in a Debian environment.

The first line is a command to expand the data stored in the file 'pass.txt'. The next line is the contents of the file, i.e. the user (AZl) and the hash associated with that user (zWwxIh15Q). The third line is the command for running John the Ripper utilizing the '-w' flag. 'password.lst' is the name of a text file full of words the program will use against the hash, pass.txt makes a