I like this better than my solution. The technique of adding random numbers has a more crypto feel to it. It would help to use big numbers, so that they would c

I like this better than my solution. The technique of adding random numbers has a more crypto feel to it. It would help to use big numbers, so that they would conceal the underlying number better (clearly single-digit numbers would be no help, might as well extend that and use 5-digit numbers).