John the ripper - crack passwords. John the ripper is a popular dictionary based password cracking tool. It uses a wordlist full of passwords and then tries to crack a given password hash using each of the password from the wordlist. In other words its called brute force password cracking and is the most basic form of password cracking. Using default input encoding: UTF-8 Loaded 1 password hash (Raw-SHA256 SHA256 128/128 SSE2 4x) Press 'q' or Ctrl-C to abort, almost any other key for status 0g 0:00:00:06 DONE (2017-01-06 12:47) 0g/s 2347Kp/s 2347Kc/s 2347KC/s Session completed show $ john -show mypassword 0 password hashes cracked, 1 left What did I do wrong?

  1. John The Ripper 0 Password Hashes Cracked
  2. John The Ripper 0 Password Hashes Cracked 1 Left Hand 2
  3. John The Ripper 0 Password Hashes Cracked 1 Left Hand Game
  4. John The Ripper 0 Password Hashes Cracked 1 Left Hand Free
  5. John The Ripper Nt Hash
John The Ripper is an open source and very efficient password cracker by Open-Wall. It was originally built for Unix but is now available for fifteen different platforms including Windows, DOS, BeOS, OpenVMS and Unix like operating systems. It is an Open Source tool and is free, though a premium version also exists. Initially, its primary purpose was to detect weak password configurations in Unix based Operating systems. Today it supports cracking of hundreds of hashes and ciphers.


John The Ripper can be installed in many ways. A few common ones are we can install it by using apt-get or snap. Open up the terminal and run the following commands.

This will initiate an installation process. Once it finishes type ‘john’ in the terminal.

[email protected]:~$ john
John the Ripper 1.9.0-jumbo-1 OMP [linux-gnu 64-bit 64 AVX2 AC]
Copyright (c)1996-2019 by Solar Designer and others

This means John the Ripper v1.9.0 is now installed on your device. We can see the homepage URL sending us to Open-wall’s website. And Usage given below indicates how to use the utility.

It can also be downloaded and installed via snap. You need to install snap if you do not already have it.

[email protected]:~$ sudo apt update
[email protected]:~$ sudo apt install snapd

And then install JohnTheRipper via snap.

Cracking Passwords with JohnTheRipper

So, JohnTheRipper is installed on your computer. Now to the interesting part, how to crack passwords with it. Type ‘john’ in the terminal. The Terminal will show you the following result:

[email protected]:~$ john
John the Ripper 1.9.0-jumbo-1 OMP [linux-gnu 64-bit 64 AVX2 AC]
Copyright (c)1996-2019 by Solar Designer and others
Below the Homepage, USAGE is given as:

By looking at its usage, We can make out that you just need to supply it your password file(s) and the desired option(s). Different OPTIONS are listed below the usage providing us different choices as to how the attack can be carried out.

Some of the different options available are:


  • Default mode using default or named rules.


  • wordlist mode, read wordlist dictionary from a FILE or standard input


  • input encoding (eg. UTF-8, ISO-8859-1).


  • enable word mangling rules, using default or named rules.


  • ”incremental” mode


  • external mode or word filter

–restore = NAME

  • restore an interrupted session [called NAME]

–session = NAME

  • name a new session NAME

–status = NAME

  • print status of a session [called NAME]


  • show cracked passwords.


  • run tests and benchmarks.


  • load salts.

–fork = N

  • Create N processes for cracking.

–pot = NAME

  • pot file to use

John The Ripper 0 Password Hashes Cracked

–list = WHAT

  • lists WHAT capabilities. –list=help shows more on this option.

–format = NAME

  • Provide John with the hash type. e.g, –format=raw-MD5, –format=SHA512

Different modes in JohnTheRipper

By default John tries “single” then “wordlist” and finally “incremental”. Modes can be understood as a method John uses to crack passwords. You may have heard of different kinds of attacks like Dictionary attack, Bruteforce attack etc. That precisely, are what we call John’s modes. Wordlists containing possible passwords are essential for a dictionary attack. Apart from the modes listed above John also supports another mode called external mode. You can choose to select a dictionary file or you can do brute-force with John The Ripper by trying all possible permutations in the passwords. The default config starts with single crack mode, mostly because it’s faster and even faster if you use multiple password files at a time. The most powerful mode available is the incremental mode. It will try different combinations while cracking. External mode, as the name implies, will use custom functions that you write yourself, while wordlist mode takes a word list specified as an argument to the option and tries a simple dictionary attack on passwords.

John will now start checking against thousands of passwords. Password cracking is CPU-intensive and a very long process, so the time it takes will depend on your system and the strength of the password. It can take days. If the password is not cracked for days with a powerful CPU, it is a very good password. If it is really crucia; to crack the password then leave the system until John cracks it. As mentioned earlier, this can take many days.

As it cracks, you can check status by pressing any key. To Quit an attack session simply press ‘q’ or Ctrl + C.

Once it finds the password, it will be displayed on the terminal. All the cracked passwords are saved in a file called ~/.john/john.pot.

It displays passwords in $[HASH]:<pass> format.

ubuntu@mypc:~/.john$ cat john.pot

John The Ripper 0 Password Hashes Cracked 1 Left Hand 2

Let’s crack a password. For instance, we have a MD5 password hash that we need to crack.

We will put this into a file, say password.hash and save it in user:<hash> format.

You can type any username, it is not necessary to have some specified ones.

Now we crack it!

[email protected]:~$ john password.hash --format=Raw-MD5

It starts cracking the password.

We see that john loads hash from the file and starts with the ‘single’ mode. As it progresses, it goes onto the wordlist before moving onto incremental. When it cracks the password, it stops the session and shows the results. Rainbow rainbow ryu rar download torrent.

Password can be seen later also by:

[email protected]:~$ john password.hash --format=Raw-MD5 --show
1 password hash cracked, 0 left
Also by ~/.john/john.pot :
[email protected]:~$ cat ~/.john/john.pot

So, the password is emerald.

The internet is full of modern password cracking tools and Utilities. JohnTheRipper may have many alternatives, but it is one of the best ones available. Happy Cracking!

john Package Description

John the Ripper is designed to be both feature-rich and fast. It combines several cracking modes in one program and is fully configurable for your particular needs (you can even define a custom cracking mode using the built-in compiler supporting a subset of C). Also, John is available for several different platforms which enables you to use the same cracker everywhere (you can even continue a cracking session which you started on another platform).

Out of the box, John supports (and autodetects) the following Unix crypt(3) hash types: traditional DES-based, “bigcrypt”, BSDI extended DES-based, FreeBSD MD5-based (also used on Linux and in Cisco IOS), and OpenBSD Blowfish-based (now also used on some Linux distributions and supported by recent versions of Solaris). Also supported out of the box are Kerberos/AFS and Windows LM (DES-based) hashes, as well as DES-based tripcodes.

When running on Linux distributions with glibc 2.7+, John 1.7.6+ additionally supports (and autodetects) SHA-crypt hashes (which are actually used by recent versions of Fedora and Ubuntu), with optional OpenMP parallelization (requires GCC 4.2+, needs to be explicitly enabled at compile-time by uncommenting the proper OMPFLAGS line near the beginning of the Makefile).

Similarly, when running on recent versions of Solaris, John 1.7.6+ supports and autodetects SHA-crypt and SunMD5 hashes, also with optional OpenMP parallelization (requires GCC 4.2+ or recent Sun Studio, needs to be explicitly enabled at compile-time by uncommenting the proper OMPFLAGS line near the beginning of the Makefile and at runtime by setting the OMP_NUM_THREADS environment variable to the desired number of threads).

John the Ripper Pro adds support for Windows NTLM (MD4-based) and Mac OS X 10.4+ salted SHA-1 hashes.

“Community enhanced” -jumbo versions add support for many more password hash types, including Windows NTLM (MD4-based), Mac OS X 10.4-10.6 salted SHA-1 hashes, Mac OS X 10.7 salted SHA-512 hashes, raw MD5 and SHA-1, arbitrary MD5-based “web application” password hash types, hashes used by SQL database servers (MySQL, MS SQL, Oracle) and by some LDAP servers, several hash types used on OpenVMS, password hashes of the Eggdrop IRC bot, and lots of other hash types, as well as many non-hashes such as OpenSSH private keys, S/Key skeykeys files, Kerberos TGTs, PDF files, ZIP (classic PKZIP and WinZip/AES) and RAR archives.

Unlike older crackers, John normally does not use a crypt(3)-style routine. Instead, it has its own highly optimized modules for different hash types and processor architectures. Some of the algorithms used, such as bitslice DES, couldn’t have been implemented within the crypt(3) API; they require a more powerful interface such as the one used in John. Additionally, there are assembly language routines for several processor architectures, most importantly for x86-64 and x86 with SSE2.

John the Ripper Homepage Kali John the Ripper Repo

  • Author: Solar Designer
  • License: GPLv2

Tools included in the john package

mailer – Emails users who have had their passwords cracked
[email protected]:~# mailer
Usage: /usr/sbin/mailer PASSWORD-FILE

john – John the Ripper password cracker

[email protected]:~# john
John the Ripper password cracker, version [linux-x86-64-avx]
Copyright (c) 1996-2015 by Solar Designer and others
--single[=SECTION] 'single crack' mode
--wordlist[=FILE] --stdin wordlist mode, read words from FILE or stdin
--pipe like --stdin, but bulk reads, and allows rules
--loopback[=FILE] like --wordlist, but fetch words from a .pot file
--dupe-suppression suppress all dupes in wordlist (and force preload)
--prince[=FILE] PRINCE mode, read words from FILE
--encoding=NAME input encoding (eg. UTF-8, ISO-8859-1). See also
doc/ENCODING and --list=hidden-options.
--rules[=SECTION] enable word mangling rules for wordlist modes
--incremental[=MODE] 'incremental' mode [using section MODE]
--mask=MASK mask mode using MASK
--markov[=OPTIONS] 'Markov' mode (see doc/MARKOV)
--external=MODE external mode or word filter
--stdout[=LENGTH] just output candidate passwords [cut at LENGTH]
--restore[=NAME] restore an interrupted session [called NAME]
--session=NAME give a new session the NAME
--status[=NAME] print status of a session [called NAME]
--make-charset=FILE make a charset file. It will be overwritten
--show[=LEFT] show cracked passwords [if =LEFT, then uncracked]
--test[=TIME] run tests and benchmarks for TIME seconds each
--users=[-]LOGIN UID[,.] [do not] load this (these) user(s) only
--groups=[-]GID[,.] load users [not] of this (these) group(s) only
--shells=[-]SHELL[,.] load users with[out] this (these) shell(s) only
--salts=[-]COUNT[:MAX] load salts with[out] COUNT [to MAX] hashes
--save-memory=LEVEL enable memory saving, at LEVEL 1.3
--node=MIN[-MAX]/TOTAL this node's number range out of TOTAL count
--fork=N fork N processes
--pot=NAME pot file to use
--list=WHAT list capabilities, see --list=help or doc/OPTIONS
--format=NAME force hash of type NAME. The supported formats can
be seen with --list=formats and --list=subformats

John The Ripper 0 Password Hashes Cracked 1 Left Hand Game

unafs – Script to warn users about their weak passwords

[email protected]:~# unafs

John The Ripper 0 Password Hashes Cracked 1 Left Hand Free

unshadow – Combines passwd and shadow files

[email protected]:~# unshadow

unique – Removes duplicates from a wordlist

[email protected]:~# unique
Usage: unique [-v] [-inp=fname] [-cut=len] [-mem=num] OUTPUT-FILE [-ex_file=FNAME2] [-ex_file_only=FNAME2]
reads from stdin 'normally', but can be overridden by optional -inp=
If -ex_file=XX is used, then data from file XX is also used to
unique the data, but nothing is ever written to XX. Thus, any data in
XX, will NOT output into OUTPUT-FILE (for making iterative dictionaries)
-ex_file_only=XX assumes the file is 'unique', and only checks against XX
-cut=len Will trim each input lines to 'len' bytes long, prior to running
the unique algorithm. The 'trimming' is done on any -ex_file[_only] file
-mem=num. A number that overrides the UNIQUE_HASH_LOG value from within
params.h. The default is 21. This can be raised, up to 25 (memory usage
doubles each number). If you go TOO large, unique will swap and thrash and
work VERY slow
-v is for 'verbose' mode, outputs line counts during the run

John The Ripper Nt Hash

unshadow Usage Example

Combine the provided passwd (passwd) and shadow (shadow)(shadow) and redirect them to a file (> unshadowed.txt):

[email protected]:~# unshadow passwd shadow > unshadowed.txt

john Usage Example

Using a wordlist (–wordlist=/usr/share/john/password.lst), apply mangling rules (–rules) and attempt to crack the password hashes in the given file (unshadowed.txt):

[email protected]:~# john --wordlist=/usr/share/john/password.lst --rules unshadowed.txt
Warning: detected hash type 'sha512crypt', but the string is also recognized as 'crypt'
Use the '--format=crypt' option to force loading these as that type instead
Loaded 1 password hash (sha512crypt [64/64])
toor (root)
guesses: 1 time: 0:00:00:07 DONE (Mon May 19 08:13:05 2014) c/s: 482 trying: 1701d - andrew
Use the '--show' option to display all of the cracked passwords reliably

unique Usage Example

Using verbose mode (-v), read a list of passwords (-inp=allwords.txt) and save only unique words to a file (uniques.txt):

[email protected]:~# unique -v -inp=allwords.txt uniques.txt
Total lines read 6089 Unique lines written 5083