John the Ripper is one of the most popular password cracking tools used by security professionals and hackers alike. It is a fast and efficient tool that can help you break passwords of various types of encrypted files. In this post, we will discuss how to install John the Ripper on your terminal and how to use it.
- Install the needed dependencies:
sudo apt-get install openssl sudo apt-get install libgmp-dev sudo apt-get install libpcap-dev
- Download the latest version of John the Ripper: https://www.openwall.com/john/
- Extract the downloaded file:
tar -xvzf john-1.8.0.tar.gz
- Change to the extracted directory:
- Compile the source code by running the following command:
./configure && make
- Install John the Ripper by running the following command:
sudo make install
3 models that you can used in john the ripper
Single Crack Mode
The most basic model of John the Ripper cracks passwords that encrypt using a single algorithm. Single Crack Mode employs a pre-computed list of possible passwords and compares them against the encrypted password. It is not very effective against strong passwords and is mostly useful for cracking weak passwords.
Users utilize the Wordlist model when they possess a list of potential passwords. In this model, the system verifies each password in the list against the password hash to determine its validity. The user has the option to use an existing wordlist or to create a custom one.
The Incremental model is used when the user does not have any information about the password. This model generates and tests all possible combinations of characters to find the correct password. The user can specify the length and type of characters to include in the generated password. This model is the most time-consuming, but can be effective in cracking complex passwords.
John the Ripper is a powerful password cracking tool that can be used to crack passwords of various types of encrypted files. It is a must-have tool for security professionals and hackers who want to test the strength of their passwords