m(x) = 0x11b = 100011011 = x^8 + x^4 + x^3 + x + 1m(x) = (x^3 + x^2 + x + 1) * a(x) + (x^2)
a(x) = 0x31 = 00110001 = x^5 + x^4 + 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 1 0 1
1 1 1 1 0 0 0 1 0 0 0
SBOX(31) = 1 1 1 1 1 0 0 0 * 0 + 0 = 0
0 1 1 1 1 1 0 0 0 1 0
0 0 1 1 1 1 1 0 1 1 1
0 0 0 1 1 1 1 1 0 0 1