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Recall that the operations used in AES involve operations over the finite field GF(28), in particular over the vector space V of 4 x 4

Recall that the operations used in AES involve operations over the finite field GF(28), in particular over the vector space V of 4 x 4 GF(28 )-matrices. Which operations used in AES (SubByte, ShiftRows, AddRoundkey, MixColumns) are not linear operators on V? Explain

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