MD5 is the abbreviation of 'Message-Digest algorithm 5'. It is published by Rivest in 1992 which also published MD4 in 1990.
MD5 is the next generation of MD4, although at the time of this writing, MD5 is vulnerable. Compared to MD4, MD5 is stronger and also still very fast with the same output size. It uses 64 steps which equal to 4 passes over message.
On the real world, we can see many MD5 used as fingerprint for a file to indetify / check whether a file or data is changed.
Many application design also used MD5 for hashing the database password (It is not recommended now of course).
An MD5 hash is composed of 32 hexadecimal characters.
Note: MD5 Hash is vulnerable
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