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It is my understanding that a pre-agreed astronomical noise source with a protocol presenting a few sync bytes would do the job. Nobody records enough astronomical noise with telescopes to have a good chance of having recording your source. However: if somebody happened to record it that day, you're sunk.


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Assuming the random source is a Bernoulli process such that the von Neumann corrector can make it perfectly random, the bits are, by definition, uncorrelated with anything else, including your timestamps. In the real world that assumption may not hold, but in that case your existing von Neumann corrected random stream is also faulty. That said, the ...


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The values of these timestamps appear to be determined by two components: when your code decides to sample the GPIO inputs; and whether a bit is to be discarded or not. The first component is not proven to be random (and if you assume it is, you would not need to add complexity to this RNG; just create a second RNG based on CPU execution jitter). The ...


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By that statement, does that mean adding a random character to a random position in a Diceware word adds 10 bits to each word? No. The ten bit estimate is for adding a random symbol from the 36-item table to a random position in the passphrase. The entropy in the character choice is about five bits and the entropy in the choice of position is another ...


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If you add a truly random character into a truly random position of a word (uniformly chosen), you get "entropy of position" + "entropy of character" as addition to the entropy of the word. (Not exactly, it's a bit less). The entropy of character is the size of the possible characters. 64 possible characters would be $log2(64) = 6$ bits of entropy. Entropy ...


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There are many ways to combine random number generators: XOR the outputs. Very simple and fast. If they are independent and at least one is strong, the output is strong as well. However, if those assumptions are not true, this can be very broken. Hash the outputs. With a strong hash you combine the entropy of both. Good if the RNGs have some entropy, but ...



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