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Want a FIPS 140-2 RNG? Look at the universe. The cosmic background radiation bathes Earth in enough random numbers to encrypt everything forever. Using the cosmic background radiation – the "echo of the Big Bang" – as a random number generation isn't a new idea, but a couple of scientists have run the slide-rule over measurements of the CMB power spectrum and reckon it offers a random number space big enough to beat any current computer.
Not in terms of protecting messages against any current decryption possibility: the CMB's power spectrum offers a key space "too large for the encryption/decryption capacities of present computer systems". A straightforward terrestrial radio telescope, this Arxiv paper states, should be good enough to make "astrophysical entropy sources accessible on comparatively modest budgets".
http://www.theregister.co.uk/2015/11/12/big_bang_left_us_with_a_perfect_random_number_generator/
(Score: 2) by melikamp on Friday November 13 2015, @08:01PM
True, but of course there are very simple (non-halting) PRNGs with unbounded state. While technically bounded by the amount of available memory, they would not be bounded for any practical purpose. Like this one, for example, will print the most famous normal number, and won't run out of memory during our lifetimes:
; Using Common LISP for brevity, since having the long arithmetic really helps
(loop for x from 0 do (write x))