SHA-3 is a family of cryptographic hash functions, intended to replace and . SHA-3 was chosen by NIST in a competition started in November 2007. The winner was declared to be the Keccak family in October 2012. The other finalists in the competition were BLAKE, Grøstl, JH and Skein .

Use this tag for questions about the SHA-3 competition itself and how the competing algorithms compare. For questions about a specific algorithm, use the corresponding tag, e.g. for the winner.

As of October 2012, SHA-3 has not yet been formally codified. It is intended that the next version of FIPS PUB 180 will specify Keccak functions with digest sizes 224, 256, 384, 512.

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