John The Ripper Crack Sha512 Encryption

Linux passwords are 5000 rounds of SHA-512, with salt. Comparing Drupal 7 and Linux Hashes I was able to test Drupal 7 and Linux hashes with John the Ripper and the list of 500 passwords. As shown below, john took 3.6 seconds to crack Linux hashes, but 39 seconds to crack Drupal 7 passwords.

  1. Jun 09, 2018 John the Ripper can crack the PuTTY private key which is created in RSA Encryption. To test the cracking of the private key, first, we will have to create a set of new private keys. To do this we will use a utility that comes with PuTTY, called “PuTTY Key Generator”. Click on “Generate”.
  2. By Skylor Phillips John the Ripper (is a well-known and mature password auditing tool. However, if you are working from a recent OS (e.g., Ubuntu 9.04 or later) that uses SHA-512 hashing John has a problem.
  3. To crack the majority of the passwords I’ve completed so far, I used John the Ripper and Hashcat. I began by using a series of wordlists on both the MD5 and SHA512 passwords, which I divided into two separate files consisting of only passwords hashed with the respective algorithms.

TrueCrypt is a now discontinued encryption tool. A littlewhile ago I stumbled upon an old TrueCrypt volume, unfortunately I couldn'tremember the exact passphrase! Thankfully I was able to use John theRipper to find the password and recover my old data. This post isgoing to go through the steps required to do this.

Installing John the Ripper

There are a few different versions of John the Ripper, unfortunately theofficial release doesn't support TrueCrypt volumes, therefore the example inthis post is going to use the community-enhanced Jumbo version of John theRipper. On CentOS it can be downloadedand compiled with the following steps:

  1. Install packages for building John the Ripper:

  2. Clone the source code from GitHub:

  3. Configure and compile the code:

John the ripper crack sha512 encryption tool

If everything goes well you should now be able to run john from the run/directory:

Note: for additional instructions refer todocs/INSTALL.

Extracting hashes

The jumbo version of John the Ripper comes with a Python script calledtruecrypt2john.py. This can be used to extracthashes from a TrueCrypt volume with a command similar to the following:

The resulting file will look something like the following:

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There are multiple hashes for a single volume because it's not possible totell which hashing algorithm was used. If you do remember which algorithm wasused it's worth deleting the unused hashes as this will make running johnquicker.

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Generating a wordlist

Once you've run truecrypt2john, the hard part is coming up with a wordlist.In my case I knew the passphrase was a combination of a few passwords joinedtogether. I used the following script to generate a wordlist with everypossible two or three word combination:

John The Ripper Crack Sha512 Encryption

Running the script generated a wordlist with 810 possible passphrases:

Note: if you just want a list of dictionary words you can use/usr/share/dict/words, assuming you've got the words package installed. Youcould also look at using a wordlist generation tool like crunch.

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Running john

Decrypt Sha512 Salted Hash Password

Once you've got a wordlist, john can be used to try to brute force thepassword:

If everything goes well the --show option will print any matches:

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Note: for obvious reasons this post doesn't use real passwords!