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1 . Compute the output of the MixColumns transformation for the following sequence of input bytes 6 7 8 9 AB CD . Apply the

$1 .$ Compute the output of the MixColumns transformation for the following sequence of input bytes $67 89$ AB CD $.$ Apply the InvMixColumns transformation to the obtained result to verify your calculations. Change the first byte of the input from $67$ to $77$ perform the MixColumns transformation again for the new input, and determine how many bits have changed in the output.

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