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MD5

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.

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Tag(s) : Modern Cryptography, Informatics

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# MD5

## MD5 Encoder

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.

### How to encrypt in MD5?

Encryption calculates form 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.

### How to decrypt MD5 cipher?

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

The most basic but also the longest and most costly method is to test all the possible words in a dictionary to check if their fingerprint is the one sought.

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

### How to recognize MD5 ciphertext?

The hash is composed of 32 hexadecimal characters 0123456789abcdef.

### What are the variants of the MD5 cipher?

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.

### What does MD5 means?

MD5 stands for Message Digest 5

### When MD5 have been invented?

By Ronald Rivest in 1991