Skein is a family of cryptographic hash functions with internal states of 256, 512 and 1024 bits, each of which is based on the tweakable symmetric block-cipher of the same block size, and a variable output size.

As well as operation as a cryptographic hash, Skein has an extendable argument system that allows it to used as a a , a randomized hash, a personalized hash, a , or a .

The Skein hash function was a finalist in the NIST , but was not selected as .

See the NIST “SHA-3 Cryptographic Hash Algorithm Competition”) information, or check the related Wikipedia articly for more information.

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