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Viewed 8k times 2 I've been playing with John The Ripper (JtR) to try to crack/audit a salted password that was hashed with SHA-512, with 20 interactions according to the source (for the curious, this is a Rails app, with the authlogic gem). If I understood things correctly, JtR expects its hashes in a file, where each hash follows certain format. 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.
John The Ripper Crack Sha512 Encryption Key
On Ubuntu 12.04 I created several users and passwords, then promptly proceeded to try to crack those passwords with John the ripper. One password is very strong, but the others are in my wordlists. John is still running, but I've got two cracked so far in about 20 minutes. Everything I read talks about whether the salt is known or not.
- In this post I will show you how to crack Windows passwords using John The Ripper. John the Ripper is a fast password cracker, primarily for cracking Unix (shadow) passwords.Other than Unix-type encrypted passwords it also supports cracking Windows LM hashes and many more with open source contributed patches.
- Today, I'm gonna show you how to crack MD4, MD5, SHA1, and other hash types by using John The Ripper and Hashcat. John The Ripper: 'John the Ripper is a fast password cracker, currently available for many flavors of Unix, Windows, DOS, BeOS, and OpenVMS. Its primary purpose is to detect weak Unix passwords.
In this post I will show you how to crack Windows passwords using John The Ripper.
John the Ripper is a fast password cracker, primarily for cracking Unix (shadow) passwords.Other than Unix-type encrypted passwords it also supports cracking Windows LM hashes and many more with open source contributed patches.
John The Ripper Crack Sha512 Encryption Decryption
Now lets talk about the password protection method used by Windows. Windows user account passwords are typically stored in SAM hive of the registry (which corresponds to %SystemRoot%system32configSAM file), in the SAM file the password is kept encrypted using the NTLM hash is very well known for its cryptanalysis weaknesses.
The SAM file is further encrypted with the SysKey (Windows 2000 and above) which is stored in %SystemRoot%system32configsystem file.During the boot-time of Windows the hashes from the SAM file gets decrypted using the SysKey and the hashes are loaded to the registry is then used for authentication purpose. Both system and SAM files are unavailable (i.e, locked by kernel) to standard programs (like regedit) during Windows’ runtime .
As told earlier NTLM hash is very weak for encrypting passwords.The NTLM encryption algorithm is explained below :
- ASCII password is converted to uppercase
- Padding with null is done until 14 bytes
- Split it in two 7-byte arrays
- Pad both to make 64 bits (8-byte) which will be used to create a DES key
- DES-encrypt the string “[email protected]#$%” using the array as key for each 7-byte array (results 8-byte stream)
- Join 2 cipertexts which forms the NTLM hash (16-byte)
Major pitfals of NTLM hash
- ASCII is not Unicode
- Uppercase reduce complexity
- LM fails with passwords length more than 14 characters
- Salting is not available
- It is easy to determine whether the password is less than or more than 7 characters
Cracking Windows Passwords John The Ripper
For the sake of demonstrating this I had already set a dummy account called demo and allotted a password iRock to it, which will be cracked later-on.
User Accounts showing demo user
I booted using the Ubuntu LiveCD and mounted my Windows partition - /dev/sda1
Then copied SAM and system files to /home/prakhar
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Then installed samdump2 and John The Ripper :
Then dumped the syskey and NTLM hashes from system and SAM file, respectively :
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John The Ripper Crack Sha512 Encryption Version
NTLM hashes recovered from SAM file
I then bruteforced the password using John The Ripper :
John The Ripper Crack Sha512 Encryption Tool
You can clearly see above, JTR has cracked the password within matter of seconds, I aborted the session in between since password was already recovered. Mission accomplished !