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THE CRYPTOGRAPHY GUIDE: MD5

MD5

MD5 is a hashing algorithm that takes a message of up to 264 bits and reduces it to a digest of 128 bits (16 bytes).

The algorithm is a development of the MD4 algorithm invented by Ronald Rivest and announced in 1990. Unfortunately, MD4 was flawed, so Rivest made some revisions, and the resulting algorithm was christened MD5.

Any hashing (or digest) algorithm should be such that, given a digest and the corresponding message from which it was derived, it should be computationally infeasible to construct a different message with the same digest.


 

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