Blockcipher based on the compression function of SHA-256. This cipher interprets the internal compression function of SHA-256 as blockcipher. The key is provided as "input data" and the input is fed into the "old state" whereas the output is the "new state". It supports keys from 128 to 512 bits, has 256-bits blocksize and 64 rounds. The best known attack breaks 49 of those rounds.
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