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Apple's RNG is cryptographically secure, provided it has had enough time to gather entropy. The early PRNG, though, was found to have problems in the iPhone as recently as iOS7, according to a researcher from Azimuth Security. I have not heard of any problems regarding the SecRandomCopyBytes() routine for a regular app, and there are lots of eyes on it.


This is not likely to be a good method to generate random numbers -- at least not on its own, without significant additional analysis. You need a source of random numbers that is not only noisy, but also unpredictable to an adversary. It's not clear that radio will meet that need. If you listen on a FM band, an adversary who is nearby can also listen on ...

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