Tool to decrypt/encrypt MD5 automatically. MD5 hash of a data is a footprint of 32 characters which can identify the initial data. Hash functions are used in computers and cryptography.

MD5 - dCode

Tag(s) : Hashing Function, Modern Cryptography

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Tool to decrypt/encrypt MD5 automatically. MD5 hash of a data is a footprint of 32 characters which can identify the initial data. Hash functions are used in computers and cryptography.

**MD5** hash calculates from binary data a numeric footprint of 32 hexadecimal characters. The algorithm uses non linear function, here are the 4 main ones:

$$ F(B,C,D) = (B\wedge{C}) \vee (\neg{B} \wedge{D}) $$

$$ G(B,C,D) = (B\wedge{D}) \vee (C \wedge \neg{D}) $$

$$ H(B,C,D) = B \oplus C \oplus D $$

$$ I(B,C,D) = C \oplus (B \vee \neg{D}) $$

__Example:__ dCode is crypted e9837d47b610ee29399831f917791a44 it is not the same hash for dcode (without uppercase) which gives a9d3d129549e80065aa8e109ec40a7c8

The **MD5** is based on non-linear (and sometimes non-reversible) functions, so there is no decryption method.

However, a stupid and brute method, the most basic but also the longest and most costly method, is to test one by one all the possible words in a given dictionary to check if their fingerprint is the matching one.

dCode uses its databases of words (2 million potential passwords) whose **MD5** hash has already been pre-calculated. These tables are called rainbow tables.

If a word is not in the dictionary, then the decryption will fail.

The hash is composed of 32 hexadecimal characters 0123456789abcdef, so 128 bits.

Statistically speaking, for any string (and there is an infinite number), the **MD5** associates for a given value a 128-bit fingerprint (a finite number of possibilities). It is therefore mandatory that there are collisions (2 strings with the same hash). Several research works on the subject have demonstrated that the **MD5** algorithm, although creating a large entropy of data, could be attacked, and that it was possible to generate chains with the same fingerprints (after several hours of neat calculations).

__Example:__ Discovered by Wang & Yu in How to break **MD5** and other hash functions, the two hexadecimal values (the values and not the ASCII string) `4dc968ff0ee35c209572d4777b721587d36fa7b21bdc56b74a3dc0783e7b9518afbfa200a8284bf36e8e4b55b35f427593d849676da0d1555d8360fb5f07fea2`

`4dc968ff0ee35c209572d4777b721587d36fa7b21bdc56b74a3dc0783e7b9518afbfa202a8284bf36e8e4b55b35f427593d849676da0d1d55d8360fb5f07fea2`

have the same hash: '008ee33a9d58b51cfeb425b0959121c9 (they only differ by 8 hexadecimal digits)

Since this publication in 2005, **MD5** encryption is no longer considered cryptographically, giving way to its successors: SHA1 then SHA256.

The **MD5** is threatened by the growing computing capabilities of supercomputers and processors capable of parallelizing hash functions. Thus, to complicate the search by the rainbow tables (databases), it is recommended to add salt (a prefix or a suffix) to the password. In this way, the precalculated tables must be calculated again to take account of the salt which systematically modifies all the fingerprints.

__Example:__ **MD5**(dCode) = e9837d47b610ee29399831f917791a44 but **MD5**(dCodeSUFFIX) = 523e9a807fc1d2766c3e3d8f132d4991

Another variant is the application of DOUBLE **MD5**, which consists in applying the hash algorithm twice.

__Example:__ **MD5**(dCode) = e9837d47b610ee29399831f917791a44 but **MD5**(**MD5**(dCode)) = c1127c7b6fdcafd97a96b37eaf035eaf

**MD5** is not the only hash function, it also exists SHA1, SHA256, SHA512 etc.

**MD5** stands for Message Digest 5

By Ronald Rivest in 1991

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md5,hash,message,digest,password,double,salt,salting,salted

Source : https://www.dcode.fr/md5-hash

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