1. A computer-implemented method comprising: receiving a distinguished set of input values from a data storage; generating a hash function for the distinguished set of input values, the hash function being operative to map distinct input values in the distinguished set of input values to distinct hash values in a set of hash values, and further operative to map all input values outside the distinguished set of input values to hash values outside the set of hash values; and using a processor, determining a hash value for each of the input values in the distinguished set of input values using the hash function.