Tool to decrypt / encrypt with hash functions (MD5, SHA1, SHA256, bcrypt, etc.) automatically. The hashing of a given data creates a fingerprint that makes it possible to identify the initial data with a high probability (very useful in computer science and cryptography).
A portable password cracker with built-in efficient implementations of multiple password hashing algorithms found on various Unix flavors. Additionally supports Kerberos AFS and Windows NT LanMan hashes, plus many more with contributed patches. Officially supported are most Unix-like systems (including Mac OS X), Win32, DOS. There're unofficial packages for BeOS and OpenVMS.
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Answers to Questions
How to calculate/encode a hash?
The hash functions use computer data (in binary format) and apply nonlinear and non-reversible functions with a strong avalanche effect (the result is very different even if the input data is very similar). The fingerprint is usually returned as hexadecimal characters.
Example:dCode has for hashMD5e9837d47b610ee29399831f917791a44
Example:dCode has for hashSHA115fc6eed5ed024bfb86c4130f998dde437f528ee
Example:dCode has for hashSHA256254cd63ece8595b5c503783d596803f1552e0733d02fe4080b217eadb17711dd
See the dCode pages for each hash function to know how it works in detail: MD5, SHA1, SHA256, etc.
How to decrypt a hash?
The principle of hashing is not to be reversible, there is no decryption algorithm, that's why it is used for storing passwords: it is stored encrypted and not unhashable.
Example:123+456=579, from 579 how to find 123 and 456? This is not possible except by trying all possible combinations.
The hash functions apply millions of non-reversible operations so that the input data can not be retrieved.
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Hash functions are created to not be decrypable, their algorithms are public. The only way to decrypt a hash is to know the input data.
What are rainbow tables?
Theoretically, a brute-force mode is possible by testing all the binary strings, but a short message of 6 bytes already represents 281,000 billion combinations. Even with fast processors capable of performing millions of hash calculations per second, several days, months or years of calculations are therefore necessary to try all the possibilities in order to find a single hash.
However, users generally always use the same passwords and some characters more than others, so it is possible to store the most likely binary strings and their respective hashes in a very large dictionary. These dictionaries are called rainbow tables. These tables make it possible to test all the words of a given dictionary to check if their fingerprint corresponds to a given one.
Example: dCode uses its word and password databases with millions of pre-calculated hashes.
If the word is not in the dictionary, then there will be no result.
How to recognize a hash?
A hash can take many forms, but the most common are hexadecimal strings: 32 characters 0123456789abcdef for the MD5, 40 for the SHA-1, 64 for the SHA-256, etc.
The encoding system based on bcrypt uses the symbol $ followed by a number indicating the algorithm used and its possible parameters.
What is a salt (for a hash)?
The rainbow tables (gigantic databases of hash and password matches) are growing day by day and accumulating passwords stolen from various sites, and taking advantage of the computational performance of super calculators, allow today to decipher short passwords in minutes / hours.
In order to counter this technique, it is recommended to add salt (some characters in prefix or suffix) to the password/message. In this way, the precalculated tables must again be calculated to account for the salt that systematically modifies all the fingerprints, the salting step. Passwords are salted.
Example:MD5(dCode) = e9837d47b610ee29399831f917791a44 and MD5 (dCodeSUFFIX) = 523e9a80afc1d2766c3e3d8f132d4991
What is a cost (for a hash)?
Cost is the measure of the resources needed to calculate a hash. In order to complicate the task of creating the rainbow tables, it is possible to complicate some hashes so that the calculations take several milliseconds or seconds, which makes the duration necessary for the attacks too great to be applicable.
What is bcrypt?
bcrypt is a library of cryptographic functions that applies recursion rules to hash functions. Natively, the notions of salt and cost are applicable.
Source code
dCode retains ownership of the online 'Hash Function' tool source code. Except explicit open source licence (indicated CC / Creative Commons / free), any algorithm, applet or snippet (converter, solver, encryption / decryption, encoding / decoding, ciphering / deciphering, translator), or any function (convert, solve, decrypt / encrypt, decipher / cipher, decode / encode, translate) written in any informatic language (PHP, Java, C#, Python, Javascript, Matlab, etc.) no data, script or API access will be for free, same for Hash Function download for offline use on PC, tablet, iPhone or Android ! Fnis behavior download.
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Questions / Comments
Brute force password cracker and breaking tools are sometimes necessary when you lose your password. There are other cases as well, such as white hat penetration testing or possibly testing the strength of your own passwords.
Password crackers that can brute force passwords by trying a large amount of queries pulled from a .txt or .csv file are available across all operating systems.
Windows Brute Force Password Cracker's
If you are not a native Linux or Unix user you may wish to brute force passwords on your windows operating system.
Ophcrack
Download Ophcrack
Ophcrack for windows is an excellent option for brute forcing passwords and cracking.
As stated by the developers:
Ophcrack is a free Windows password cracker based on rainbow tables. It is a very efficient implementation of rainbow tables done by the inventors of the method. It comes with a Graphical User Interface and runs on multiple platforms including Windows.
Ophcrack has a lot of advantages compared to other methods employed by most password crackers.
- Bootable from Live Disc or Live USB
- Excel and .csv exports
- Fast brute force password cracker
- Fully open-source and free
- Windows sample password file
- Brute forces LM and NTLM hashes
Brutus
Download Brutus
Are you are looking for lightning fast and windows only password cracking software? Brutus is you answer.
Brutus uses a technique called time memory trade off which allows for large multi-threaded brute forcing attacks all at once.
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Brutus like Ophcrack requires you to use rainbow tables for brute force password cracking. You can go a few routes to obtain rainbow tables.
- Rainbow tables can be generated yourself and collected over time.
- Free sets of rainbow tables can also be grabbed here: http://project-rainbowcrack.com/table.htm
- As a last resort or for a bit more data rainbow tables are available for purchase at http://www.osforensics.com/rainbowtables_hashsets.html and http://project-rainbowcrack.com/buy.php
Cain and Able
Download Cain and Able
Cain and Able is not only a password cracker but and overall excellent network security tool.
Oxid.it the creators of Cain and Able detail the software as,
Cain & Abel is a password recovery tool for Microsoft Operating Systems. It allows easy recovery of various kind of passwords by sniffing the network, cracking encrypted passwords using Dictionary, Brute-Force and Cryptanalysis attacks, recording VoIP conversations, decoding scrambled passwords, recovering wireless network keys, revealing password boxes, uncovering cached passwords and analyzing routing protocols.
As you can see Cain and Able opens up many more options and methods for obtaining passwords to crack and brute forcing them.
Linux Password Cracking Software
Linux is widely known as a common OS for security professionals and students. Linux has the most brute force password cracking software available compared to any OS and will give you endless options.
John the Ripper
Free Password Hash Cracker
Download John the Ripper
John the Ripper is compatible with Linux, Unix and fully able to brute force Windows LM hashes. Although, John the Ripper is not directly suited to Windows. This software is extremely fast at brute force cracking Linux and Unix NTLM hashes.
John the Ripper Pro is also available for business facing users that would like the software tailored to their operating system. The free JtR will work very well for the average user.
So is John the Ripper any Good?
Yes. Here is just a few of their credentials and reputable organizations that they are involved in:
John the Ripper is part of Owl, Debian GNU/Linux, EnGarde Linux, Gentoo Linux, Mandriva Linux, and SUSE Linux. It is in the ports/packages collections of FreeBSD, NetBSD, and OpenBSD.
John the Ripper is a registered project with Open Hub and it is listed at SecTools.
Medusa
Download Medusa
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Medusa is a variation of the THC Hydra cracking software. Medusa has many advantages by being a speedy parallel, modular and login brute forcing tool.
Medusa speed really brings a great amount of appeal to the password cracking suite but the best feature of Medusa is their ability to run across a wide array of platforms and services.
Medusa supports:
- HTTP
- FTP
- SSH
- AFP
- IMAP
- MS SQL
- MYSQL
- NCP
- NNTP
- POP3
- PostgreSQL
- pcAnywhere
- rlogin,
- Telnet
- rsh
- SMTP
- SNMP
- CVS
- VNC
- VmAuthd
- SMB
- SV
Medusa's parallel attacks are a truly unique option for pen-testers and hackers to utilize. With Medusa you are able to supply both a username file and a password file to attack both concurrently.
So how do I use Medusa brute force password cracking software? Simply entering 'medusa' without any options into your terminal will return every one of the parameters it accepts along with their specific descriptions.
Need to crack more than one password? Medusa is your answer.
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