1. The problem statement, all variables and given/known data * note that I meant fields in the abstract mathematical sense, notphysical (i.e. electric) fields! * Finding the determinant of a matrix in GF(28) I want to know if it is using mod 256 or mod 255 in the field of GF(28) 2. Relevant equations Just math 3. The attempt at a solution I found the determinant of a matrix no problem. Everything in between is all good. What I want to know is that in the field of GF(28), am I taking the number mod 255 or mod 256? I know that there are a total of 256 elements in the field, but I'm just not sure which mod to take for the final answer, since it is a negative determinant.