Snefru in Wikipedia
Snefru is a cryptographic hash function invented by Ralph
Merkle which supports 128-bit and 256-bit output. It was named
after the Egyptian Pharaoh Sneferu, continuing the tradition
of the Khufu and Khafre block ciphers.
The original design of Snefru was shown to be insecure by Eli
Biham and Adi Shamir who were able to use differential
cryptanalysis to find hash collisions. The design was then
modified by increasing the number of iterations of the main
pass of the algorithm from two to eight. Although differential
cryptanalysis can break the revised version with less
complexity than brute force search (a certificational
weakness), the attack requires 288.5 operations and is thus
not currently feasible in practice.[1] - Wikipedia
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