11. The method of claim 1 , further comprising: storing a proper subset of the generated encrypted instances in an encrypted instance cache table.
11. The method of claim 1 , further comprising: storing a proper subset of the generated encrypted instances in an encrypted instance cache table. 12. The method of claim 11 , wherein selecting at least one of the encrypted instances includes generating at least one encrypted instance based on an encrypted instance stored in the encrypted instance cache table.