c# - Generate a unique number that is formed from 2 numbers and vice versa? -


i not sure if possible but,

i have 2 numbers, 32-bit int x , 64-bit long y.

given 'y' unique.

given these numbers, want generate unique identifier 32-bit int. should able construct individual numbers unique identifier. possible? apologize if wrong forum ask, related c# programming on project working on.

basically, 'x' refers categoryid , 'y' refers unique 'categoryitemid' in database, single category can have million of catalogitems.

thanks!

to sum up:

  • you have 96 (== 32 + 64) bits of possible inputs.
  • you want unique 32 bit value regardless of input values.
  • 32 < 96

it's not possible. entropy of inputs larger entropy of output.


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