Iterated cipher Encryption operation W←X g w, Ki), W2=g w1, K2), WNr= g.1, KNr), y←w5 Iterated cipher … Encryption operation: w0  x w1 = g(w0 , K1 ), w2 = g(w1 , K2 ), wNr = g(wNr-1 , KNr), y  wNr