5. The apparatus according to claim 3 , wherein each bit (z i ) of the intermediate binary word (z) is equal to a value derivable by an individual intermediate bit Boolean function.
5. The apparatus according to claim 3 , wherein each bit (z i ) of the intermediate binary word (z) is equal to a value derivable by an individual intermediate bit Boolean function. 6. The apparatus according to claim 5 , wherein each individual intermediate bit Boolean function depends on the same common Boolean function.