m(x) = 0x11b = 100011011 = x^8 + x^4 + x^3 + x + 1m(x) = (x) * a(x) + (x^6 + x^5 + x^3 + 1)
a(x) = 0xb9 = 10111001 = x^7 + x^5 + x^4 + x^3 + 1
1 0 0 0 1 1 1 1 0 1 0
1 1 0 0 0 1 1 1 1 1 1
1 1 1 0 0 0 1 1 1 0 1
1 1 1 1 0 0 0 1 1 0 0
SBOX(b9) = 1 1 1 1 1 0 0 0 * 0 + 0 = 1
0 1 1 1 1 1 0 0 0 1 0
0 0 1 1 1 1 1 0 0 1 1
0 0 0 1 1 1 1 1 1 0 0