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Internally, Skein-1024 uses the Threefish-1024 compression function and is extended to 1024 bits of internal state whereas Skein-512 uses the Threefish-512 compression function. There are a few additional changes but they are very similar (just like SHA-256 and SHA-512 are, for instance). The tweak handling is, however, the same since all Threefish variants ...


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The main reason for designing a cryptographic hash function using an output transformation is flexibility. In the following, I try to motivate the need for an output transformation. For example, SHA-256 has no output transformation and a fixed output size of 256-bit. What happens if you truncate a SHA-256 hash value? In this case, there are no security ...



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