“John the Ripper” – is a fast password cracker. Its primary purpose is to detect weak Unix passwords.
Most likely you do not need to install “John the Ripper” system-wide.
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Instead, after you extract the distribution archive and possibly compile the source code (see below), you may simply enter the “run” directory and invoke John from there.
Compiling “John the Ripper”
Step 1: Download the latest version of ““John the Ripper”” and its signature
Step 2: Confirm the signature
This is a safety measure as we are dealing with dangerous thing.
Install the public key:
Check the signature:
You will see the message similar to the above. Ignore the warning as long as it says Good signature from “Openwall Project … “.
The warning is normal, see http://www.kernel.org/signature.html for more details.
Step 3: Uncompress and compile the sources
Note the make target for your system and type:
Where <system> is the appropriate make target. Alternatively, if your system is not listed, use:
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If everything goes well, this will create the executables for John and its related utilities under “../run/”.
Alternatively, you may copy the entire “run” directory to anywhere you like and use John from there.
Now you can change directory to there and test John, like this:
Installing “John the Ripper” on Ubuntu
Execute the next command to install “John the Ripper” on Ubuntu:
Installing “John the Ripper” on CentOS/RHEL
Execute the next command to install “John the Ripper” on CentOS/RHEL: