I don't understand how the AddRoundKey function works, because the following example is from the cipher authors. I`m trying to add 76 and 7d, and my result is f3. Could someone explain this?
8F 20 3E 06 5F C3 54 45 B5 FE B9 AC A7 A0 C6 76 + 86 2F 1F 65 3B 77 5B A1 D0 5C BC 2F 38 E2 D8 7D = 16 50 5E 6B 9B 3A B1 E6 86 5B 77 DC E0 82 A0 F4