Cosmic background radiation as observed by a sensor connected to the computer is not random. All I&#x27;d need to mess with the randomness is to put a focused radiation source near the device. Sampling randomness from the environment surrounding the physical installation of the device is not good. I hope no one is doing this.<p>There&#x27;s no reason why you wouldn&#x27;t want to use truly random numbers for cryptography. That&#x27;s what &#x2F;dev&#x2F;random is supposed to provide.