John The Ripper Hash Formats John the Ripper is a favourite password cracking tool of many pentesters. There is plenty of documentation about its command line options. A word list is literally a list of words that John (or any other password cracker) will iterate through, trying each one on the list. So, for example, if your word list contains the words ‘apple’, ‘bakery’ and ‘cookie’, John will encrypt each word, check if they match the hash you're trying to crack, and, if none of them do, the program will exit, like it has in this case. I processed those hashes using my wordlist and John the Ripper (1.7.9-jumbo-7_omp), without using any rules, just the wordlist as-is ('john --wordlist=Md5decrypt-awesome-wordlist --format=raw-md5 Hashdump-benchmark' was the exact command). John the Ripper cracked exactly 122.717.140 hashes, which is about 63.92% of the total file. I guess you could go higher than this rate if you use the rules in John the Ripper. John is accessible for several different platforms which empower you to utilize a similar cracker everywhere.John the Ripper Pro includes support for Windows NTLM (MD4-based) and Mac OS X 10.4+ salted SHA-1 hashes.
- Sha1 Hash Function
- John The Ripper Crack Sha1 Hash Values
- John The Ripper Crack Sha1 Hash Value 1
- C# Sha1 Hash
- How To Get Sha1 Hash
Sha1 Hash Function
I'm using John the Ripper version 1.7.8 on Linux Ubuntu to crack Linux user passwords as an exercise. I run the Linux on a virtual machine. I created a user called 'User1' to the system and set a password 'axby' for it. Then I got the password hash with the usual command:
Then I run John with command:
As I'm writing this question the program has run like 30 minutes trying to guess a simple 4-letter password. Is this normal? Or have I done something wrong? Any suggestions to speed things up would be appreciated.
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John The Ripper Crack Sha1 Hash Values
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1 Answer
Yes, that is pretty common since John uses either a Dictionary Attack or Brute-force. Neither of which are terribly fast, especially against many modern hashing algorithms running on a single thread (running some hashes is expensive, as @DavidSchwartz mentions).
John without arguments also uses pretty slow methods, from the FAQ:
Q: How long should I expect John to run?
A:It primarily depends on the cracking mode(s) and on your password files (in particular, the type of hashes and the number of different salts, if applicable). Most importantly, you should note that the 'incremental' mode, which a default John run (with no command line options) proceeds with after being done with the quicker checks, is not supposed to terminate in a reasonable time.
One option to try to squeeze out better performance is to enable parallelization with --fork=N (N is number of processes) or --node. See the options list for details on those.
Theoretically, if you have two threads running semi-intelligently - your execution time should be cut in ~half. (Note the qualifier 'theoretically', YMMV in the real world)
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John the Ripper is an old school hacker tool. It has been around since the early days of Unix based systems and was always the go to tool for cracking passwords. When you needed to recover passwords from /etc/passwd or /etc/shadow in more modern *nix systems, JTR was always ready to roll.
When thinking of current password breaking technology the you must think about GPU support. The default version of John the Ripper does not come with GPU support, however there are community builds known as the jumbo patch available that contain the additional code for GPU support as well as a larger number of supported hash types.
John The Ripper Crack Sha1 Hash Value 1
How to use John The Ripper to Recover Passwords
Generally John expects to receive password hashes in the form user:hash in a plain text file. When run against a file in this format John The Ripper does a pretty good job at identifying the hash type and beginning to try and break it.
It is literally as simple as that, this uses the default password recovery mode as well as the default word list or dictionary.
C# Sha1 Hash
Of course there are many more options available when running JTR, here is the command line help:
How To Get Sha1 Hash
In this command line help, we can see there are a large number of hash types that JTR is able to have a go at cracking. This help is from the Jumbo Patch version of John the Ripper hence the large number of available hash types.