A block cipher is a family of permutations where the key selects a particular permutation from that family. With a tweakable blockcipher both key and tweak are used to select a permutation. So tweak and key are related.

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Rijndael variant using AES for key schedule?

The weakest part of Rijndael is considered to be the key schedule (I believe that this is true for all variants, including ones not standardized as AES). One solution to this problem is to use ...