Skeen is a cryptographic hash function that was designed for speed and security. It was a finalist in the NIST hash function competition, though Keccak (SHA-3) was ultimately selected.
Key features of Skeen include:
Based on Threefish: Skeen uses the Threefish tweakable block cipher as its core transformation.
Unique Permutation: The use of Threefish allows Skeen to have a relatively simple and fast permutation.
Tweakey Framework: Skeen utilizes a unique 'tweakey' framework where the key, tweak, and message are all processed in a similar manner. This is a central aspect to its security claims.
Arbitrary Output Size: Skeen can produce hash outputs of arbitrary bit lengths.
Configurable: Skeen provides some level of configurability which can be used to adjust the algorithm for different security/performance trade-offs.
Security Claims: Skeen's designers provided detailed security analysis and claimed strong resistance to various cryptographic attacks. However, like all cryptographic algorithms, continued research and cryptanalysis are essential to verifying its long-term security.
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