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What is Add Round Key

What is meant by the term Add Round Key.

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In Add Round Key, 128 bits of the State include bit wise XORed with 128 bits of round key. The operation is considered as the column wise operation between 4 bytes of the State column and one word of round key; it may also be viewed as the byte-level operation. The Add Round Key transformation is as simple as possible and affects each bit of the State.

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