1. A method of identifying a memory cell state for use in a physically unclonable function (PUF), the method comprising: comparing at least one physical parameter of a memory cell with a threshold value of the physical parameter; identifying a relationship of the at least one physical parameter of the memory cell to the threshold value; associating one of a 0, 1, and X state to the memory cell based on the relationship of the at least one physical parameter to the threshold value; programming at least one state storage memory cell to store a programmed value corresponding with the associated 0, 1, or X state; including the programmed value of the at least one state storage memory cell in a PUF data stream.