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Maybe I'm misinterpreting something, but… isn't this really about https://en.wikipedia.org/wiki/Perfect_hash_function https://en.wikipedia.org/wiki/Perfect_hash

• Retr0id 2y ago
  No, I mean in the sense given on the page (I should've included the parenthetical in my quote) > (e.g. a random permutation of all 32-bit integers) Since they only use bijective primitives, it's trivially "perfect" in the "perfect hash function" sense. To elaborate further on the definition I was going off (which may well not be what the author meant): > A PRF is considered to be good if its behavior is indistinguishable from a truly random function. Therefore, given an output from either the truly random function or a PRF, there should be no efficient method to correctly determine whether the output was produced by the truly random function or the PRF. https://en.wikipedia.org/wiki/Pseudorandom_function_family https://en.wikipedia.org/wiki/Pseudorandom_function_family