Can the xor of two RNG outputs ever be less secure than one of them?


crazy2383
HOME ยป Information Security

Suppose I'm suspicious that one or more (pseudo)-random number generators is cryptographically flawed, perhaps even deliberately backdoored. The RNGs in this case might be either PRNG algorithms, hardware random number generators, or some OS-provided primitive whose source might be either of these.Can it ever be a bad thing to "salt" the RNG by using the xor of its output and some other RNG's output? The latter RNG might be of much lower quality but be unlikely to have been compromised by th

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Suppose I'm suspicious that one or more (pseudo)-random number generators is cryptographically flawed, perhaps even deliberately backdoored. The RNGs in this case might be either PRNG algorithms, hardware random number generators, or some OS-provided primitive whose source might be either of these.
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