What is Add Round Key
What is meant by the term Add Round Key.
Expert
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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