checksum is an function used to to calculated some value for given data. As we see check is used to check given data with calculated sum. Data may be little or very big like 1 MB, 10 MB etc. but the checksum value will be the same size bu different for each...
Security is important part of the today IT and gains more respect from IT world. Hashing is a security measure to protect and check our data. In this tutorial we will look how to use hash with tables and strings. What is Hash Hash is a function where provided data...
This is the most powerful cracking mode. Keep in mind that generally cracking will never end in this mode if there is no password because combinations are too large. Configurations about Incremental Mode can be found in configuration file [Incremental:MODE] section.
$ john --incremental unshadowed
–incremental is used to specify incremental Mode Set Only Numeric...
As we stated before in single crack mode [List.Rules:Single] method of configuration file is used. In this mode login:password are cracked by using default password-list. Single Mode is much faster than Wordlist Mode. Linux Example We will crack linux passwords with Single Mode. First we need the create one file by unshadowing /etc/passwd and /etc/shadow...
Hackers preferred mode for tool usage is cli. John is developed for cli primarily. But there is also a gui part and can be installed like below. We named is johnny
$ apt-get install johnny -y
We can provide login and password hashes like below We can select password hash type manually...
John have a lot of different features and in order to configure these features it provides a lot of configuration options. In this tutorial we will look some of them. Getting Help There is two way to get help abut John. One is the simplest way by using -h .
$ john -h
John the Ripper password cracker, version 220.127.116.11-jumbo-1-bleeding [linux-x86-64]
Copyright (c) 1996-2015 by Solar Designer and others
Usage: john [OPTIONS] [PASSWORD-FILES]
--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 can be run Unix,Linux,Windows,MacOS Platforms. Source code can be found at github. Debian,Ubuntu:
apt-get install -y john
yum install -y john
Windows: Here is the windows binaries. http://www.openwall.com/john/j/john180j1w.zip
Windows operating system provides different ways to manage remote systems. Telnet, RDP, VNC are some of them. But these options are generally bound to a graphical user interface. If we prefer command line interface there is an alternative named Psexec. Psexec is actually a toolset consisting of following tools. PSexec used...
GnuPG is opensource and popular alternative to the PGP. PGP provide encryption related function. PGP provides hash function like standard linux packages. We will look ow to verify files downloaded from internet with their PGP signatures to verify. Find PGP Information In this example we will use Apache source code....