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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 ...


The problem with questions that ask for “the fastest” is, that such questions always raise the counter-question: compared to what exactly? Also, your question doesn’t specify if you mean cryptographically secure physical random number generators, or any physical random number generator. Anyway… 400 Mbps doesn’t really come anywhere near the word “fastest”. ...

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