http://www.quora.com/How-do-you-symmetrically-encrypt-32-bit-auto-increment-IDs-to-avoid-using-64-bit-UUIDs-to-conceal-the-size-and-order-of-a-database-table/an

http://www.quora.com/How-do-you-symmetrically-encrypt-32-bit-auto-increment-IDs-to-avoid-using-64-bit-UUIDs-to-conceal-the-size-and-order-of-a-database-table/answers/23925 http://www.quora.com/How-do-you-symmetrically-encrypt-32-bit...