GF(2) GF(2M ) 276 F(X) G(X) GF(2M ) G(X) G(X) t G(X) = (X + α)(X + α2 )(X + α3 )…(X + α2t )F(X) GF(2M ) α G(X) = 0 α α2t α GF(24 ) G(X) = X4 + X + 1 = (X + α)(X + α2 )F(X) F(X) = (X + α4 )(X + α8 ) 2t = 2 G(X) = (X4 + X + 1)(X4 + X3 + X2 + X + 1) = (X + α)(X + α2 )(X + α3 )(X + α4 )F(X) F(X) = (X + α6 )(X + α8 )(X + α12 )(X + α9 ) 2t = 4 G(X) = 0 α α α F(X) F(X) α α 277 α α3 α α3 α5 GF(24 ) GF(24