The first row of State is not altered;for the second row a 1-byte circular left shift is performed;for the third row a 2-byte circular left shift is performed;and for the fourth row a 3-byte circular left shift is performed.This transformation is called __________ .
A)AddRoundKey
B)ShiftRows
C)MixColumns
D)Substitute bytes

Question

Quizplus · Accepted Answer

The transformation where a circular left shift is performed on each row of the State matrix is called ShiftRows. AddRoundKey is a different transformation where each byte of the State matrix is XORed with a corresponding byte from the encryption key. MixColumns is a transformation where each column of the State matrix is multiplied by a fixed matrix, and SubstituteBytes is a transformation where each byte of the State matrix is replaced with a corresponding byte from a fixed substitution table. Therefore, the correct answer is B.

The First Row of State Is Not Altered;for the Second