8. Prove that the multiplicative inverse of 6 is 4 in GF (2^4) when the irreducible polynomial used is x^4 + x^3 + 1

9. Knowing that 3/5 mod 7, repeat the same in the AES Galois Field (GF (2^8) and P(x) = x^8 + x^4 + x^3 + x + 1). The answer needs to be represented as a decimal number

10. In a particular round of AES-256 the complete output of byte substitution layer is: 00112233445566778899AABBCCDDEEFF. What is the input to the MixColumn layer in that same round?