!!! Overview
[{$pagename}] ([TBC]) is a [Block Cipher] that accepts a second input called the __tweak__ along with its usual [plaintext] or ciphertext input. 

The tweak, along with the [key], selects the permutation computed by the [cipher]. If changing tweaks is sufficiently lightweight (compared with a usually fairly expensive key setup operation), then some interesting new operation modes become possible. 

!! More Information
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