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assam alaikum everyone today we are going to solve aes matrix column problem in which we are given with a state matrix that is written over here this is a 4 cross 4 matrix in the solution we have to multiply this state matrix with a mixed column matrix this mixed column matrix is very very easy to construct in this matrix we just have to remember the first column that is 0 2 0 1 0 1 and 0 3 next matrix will be constructed as this 0 3 will shift over here this 0 2 will come here this 0 1 will come here and this 0 1 will come here similarly this 0 1 will be shifted over here 0 3 will come here 0 2 and 0 1 and for the final column 0 1 will shift here 0 1 here 0 3 and 0 2 for aes mixed column matrix we will multiply these both matrices and we know that for matrix multiplication we multiply for first element to transform first element that is 63 we will multiply first row of this matrix with the first column of this matrix that is since we have to transform this 63 so we will trigger this
