@staticmethod
def RotWord(word):
    """ Takes a word [a0, a1, a2, a3] as input and perform a
        cyclic permutation that returns the word [a1, a2, a3, a0].

        :param str word: Row within State Matrix
        :return: Circular byte left shift """
    return int(word[2:] + word[0:2], 16)
