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).

Hash Function - dCode

Tag(s) : Modern Cryptography, Informatics

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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).

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 **hash** MD5 e9837d47b610ee29399831f917791a44

Example: dCode has for **hash** SHA1 15fc6eed5ed024bfb86c4130f998dde437f528ee

Example: dCode has for **hash** SHA256 254cd63ece8595b5c503783d596803f1552e0733d02fe4080b217eadb17711dd

See the dCode pages for each **hash** function to know how it works in detail: MD5, SHA1, SHA256, etc.

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 decryptable.

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.

**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.

Theoretically, by testing all input bit strings (all passwords for example), it is possible to store all the results in a dictionary. dCode uses its word and passwords databases already pre-calculated **hash**. These dictionaries are called rainbow tables.

It is therefore possible to test all the possible words in a dictionary to check if their fingerprint is the one sought.

If the word is not in the dictionary, then there will be no result.

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.

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.

Example: MD5 (dCode) = e9837d47b610ee29399831f917791a44 and MD5 (dCodeSUFFIX) = 523e9a80afc1d2766c3e3d8f132d4991

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.

bcrypt is a library of cryptographic functions that applies recursion rules to **hash** functions. Natively, the notions of salt and cost are applicable.

dCode retains ownership of the source code of the script Hash Function online. Except explicit open source licence (indicated Creative Commons / free), any algorithm, applet, snippet, software (converter, solver, encryption / decryption, encoding / decoding, ciphering / deciphering, translator), or any function (convert, solve, decrypt, encrypt, decipher, cipher, decode, code, translate) written in any informatic langauge (PHP, Java, C#, Python, Javascript, Matlab, etc.) which dCode owns rights will not be given for free. To download the online Hash Function script for offline use on PC, iPhone or Android, ask for price quote on contact page !

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Source : https://www.dcode.fr/hash-function

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