4 ms·

It's the german tank problem. Serial IDs, with some light assumptions, leak information about the total count of items.

• BenjiWiebe 5y ago
  Just pick a random number at the beginning, and start incrementing IDs from there. Like personal checks starting at 1000 so they're always(ish) 4 digit. Of course, maybe pick another starting number that's less obvious.
  • sk5t 5y ago
    That's not effective at all.
  • nimish 5y ago
    Still leaks count -- you do similar stuff to estimate the minimum and the maximum.