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When talking about encryption with block ciphers, you should distinguish block cipher itself from the mode of operation that employs the block cipher. Block cipher takes an input $P$ of fixed length $n$ and transforms it under key $K$ (and possibly under other parameters such as tweak $T$) to output $C$ of the same length $n$: $$ E:\; P \xrightarrow{K(,T)} ...



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