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Rot Word and Shift Rows

Explain difference between the Rot Word and Shift Rows?

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Shift Rows :

Shift Row is regarded as the simple permutation. It shifts rows circularly left or to the right.

Rot Word :

Rot word carries out one-byte circular left shift on the word. This states that the input word [b0, b1, b2, b3] is transformed into [b1, b2, b3, b0].

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