I know that it is impossible to generate truly random numbers on a deterministic device. My question is if I paired multiple pseudo-random number generators (PRNG), would that make the outcome more random. Say device 1 generates 10 numbers and device 2 generates a single number to use as an index to select a number from device 1. What would their total randomness be? Would it be more random? Does randomness add? Like resistors in parallel? In series?
I'm not sure how to define "more random", but I mean it in the sense that people say that some PRNGs are cryptographically secure (CSPRNG) and others are not. What would be the result if device 1 was CSPRNG and device 2 was not? What about the other way around?
My intuition tells me that in this implementation the result couldn't be less random than device 1 and that device 2 might not have any impact (so randomness_device1 + randomness_device2 = randomness_device1).