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MD5 is a hash function that is no longer considered secure from a cryptographic point of view. Therefore, it should only be used for backward compatibility.

MD5 was a cryptographic hash function that generated a 128 bit output. It was designed in 1992. But since then weaknesses in the collision resistance have been discovered, which make MD5 unsuitable for almost all use cases.

Furthermore MD5 is an extremely fast algorithm that can be speed up even more on graphic cards. MD5 is therefore not suitable for hashing passwords anymore.

Research papers concerning the weaknesses of MD5: