1. An apparatus comprising: a magneto-resistive (MR) element configured to be applied with a static current and have a resistance determined based on magnetization of the MR element, wherein the resistance of the MR element varies while the static current is applied, and wherein the static current has a constant amplitude and polarity and is free of current pulses; and a sensing circuit configured to sense the resistance of the MR element while the static current is applied to MR element and to provide random values based on the sensed resistance of the MR element.