Security hacking

I an worried about hackers breaking into my program. I was wondering if I could separate my program into three parts on three different computers:
1. Has access to the internet and collects data and transfers data to the second computer.
2. Analyzes data and sends results to part three.
3. Has access to the internet and returns results.

I do not want any data getting to the second computer, except the specific data and in one direction only. The same goes for part 2.

Is this possible? How would I go about doing this?

Any help would be greatly appreciated.
Michael