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Typically when there's a variant of an ARX algorithm that goes from 32-bit words to 64-bit words, we do increase the rounds. As DannyNu mentioned, BLAKE2 is a variant of ChaCha, and while BLAKE2s (the 32-bit version) uses 10 rounds, while BLAKE2b (the 64-bit version) uses 12 rounds. One round of BLAKE2 is equivalent to two rounds of ChaCha, so we'd likely ...

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