Random noise isn't necessarly a hindrance -- it can help. Contrary to intuition, the presence of random noise can actually make detectable a signal that is oth

Random noise isn't necessarly a hindrance -- it can help. Contrary to intuition, the presence of random noise can actually make detectable a signal that is otherwise below the minimum detection threshold. See, e.g. stochastic resonance. (Essentially, the noise occasionally interefers constructively to 'bump' the signal up beyond the threshold to make it detectable.) If you are able to introduce and control your own noise, you may also be able to take advantage of coherence resonance. Randomness itself can be a very useful tool in many signal detection and processing systems, e.g. sparse random sampling in Compressive Sensing techniques can reconstruct some kinds of signals at frequencies beyond the Shannon-Nyquist limit of a much higher-density fixed-frequency sampling -- something thought impossible until relatively recently. I would not be at all confident that such 'system' noise could not be filtered out statistically; it might even be used to an attacker's advantage.