Understanding “randomness”

Question

I can\'t get my head around this, which is more random?

rand()

OR:

rand() * rand()

I´m f

Answer 1

"random" vs. "more random" is a little bit like asking which Zero is more zero'y.

In this case, rand is a PRNG, so not totally random. (in fact, quite predictable if the seed is known). Multiplying it by another value makes it no more or less random.

A true crypto-type RNG will actually be random. And running values through any sort of function cannot add more entropy to it, and may very likely remove entropy, making it no more random.