John the Ripper is a free, most popular and open-source password cracking tool developed by Openwall. It was first developed for Unix operating system and now runs many operating systems including Unix, macOS, Windows, DOS, Linux, and OpenVMS. Its main purpose is to detact weak Passwords.

John the Ripper uses several cracking modes that crack hashed password. You can also use custom cracking mode using in-built compiler. John the Ripper uses dictionary attack and brute force attacks to crack the password.

In this article we will install John the Ripper software and use some useful commands to crack password.

Prerequisite

The password is also saved to /.john/john.pot file. Crack password protected zip/rar file. The other example we use is to crack password protected zip/rar file. There is 2 executable file at location john/run/zip2john and john/run/rar2john in John the Ripper programme. To crack the password protected zip file, execute zip2john file with 2. In this article, we will use John the Ripper to crack the password hashes of some of the file formats like zip, rar, pdf and much more. To crack these password hashes, we are going to use some of the inbuilt and some other utilities which extract the password hash from the locked file. John the Ripper is a free software cracking tool through which you can crack the password of different file formats. It is a free and open-source software tool, it can be somewhat complex to install and use it. John the Ripper. Next we’ll need the cracking tool itself. If you’re using Kali Linux, this tool is already installed. Download John the Ripper here. In my case I’m going to download the free version John the Ripper 1.8.0 (sources, tar.gz, 5.2 MB). Once downloaded, extract it with the following linux command.

What tools do i use? The encryption algorithm of encrypted Microsoft Excel files is 40bit RC4. As it is encrypted nothing could be tweaked by opening the document with a hex editor. The correct way is to extract the password hash from the file and then cracking it using John The Ripper.

We assume you have already knows about Linux system and about Terminal and command line. We akso assume you have some basic knowledge about cracking, encryption and decryption of password.

Installation

There are many ways to install JohnTheRipper. Here we will use some of the easy ways to install. The easiest way to install JohnTheRipper is directly from command line. For that open Terminal by pressing shortcut CTRL+ALT+T and run the bellow command.

Now type john in Terminal and you will see bellow message.

Run the test mode

Or you can also download from Github and build. First let's build John the Ripper. Run the following command one bye one. First install required tools for the installation.

Also install recommended software.

Change working dirctory to ~/src folder.

Download latest version of JohnTheRipper from GitHub.

https://intensiveonline.weebly.com/blog/program-for-mac-os. Go to project dirctory.

And build from code.

Test the installed build.

Crack Ubuntu Password

Linux saves its password in /etc/shadow file. So run bellow command to get User password. D2 lod no cd crack. This will take time depends on your system configuration and password strength.

If it successfully cracks password, then it will return with following response.

Crack hashed password

How To Use John The Ripper To Crack Dmg Filehippo

One use of John The Ripper is to decrypt the hashed password. For the simplicity, we used simple password. First create password.txt file and put user and hashed password in user:password format. And run the command:

If password is successfully cracked, then it will get bellow response:

You can also choose specific encryption method with --format option:

Or use specific wordlist file with --wordlist option:

Pass --show argument to get cracked password.

The password is also saved to ~/.john/john.pot file.

Crack password protected zip/rar file

The other example we use is to crack password protected zip/rar file. There is 2 executable file at location john/run/zip2john and john/run/rar2john/meister-task-download-for-mac.html. in John the Ripper programme. To crack the password protected zip file, execute zip2john file with 2 argument as bellow:

The first ./zip-file.zip is the location of the password protected zip file and ./saved-file.txt is the file where password will be saved. Similarly for rar file, use ./rar2john command to crack password for rar file.

After getting password at saved-file.txt file, crack hashed password with bellow command.

And you will get cracked password.

Conclusion

In the last, I will only tell that this is just basic example of cracking password. There are many ways to crack password using many software. Try to search more ways and more software searching from internet. Also comment bellow if you have any query or getting problems related to the article. Have a fun.

How To Use John The Ripper To Crack Dmg File Opener

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