Reducing the conditions under which a given set satisfies the stipulations of the subset sum proposition to a set of linear relationships, the question of whether a set satisfies subset sum may be answered in a polynomial number of steps by forming, solving, and constraining a series of linear systems whose dimensions and number are both polynomial with respect to the length of the set. Given its demonstrated 100% accuracy rate and its demonstrable justification, this algorithm may provide basis to reconsider the validity of SSP-based and NP-hard-reliant cryptosystems.