Strategic Security Intelligence
Interesting Problem Sets
This section is for interesting problem sets that
educators may wish to use in their classes. We welcome your
submissions. via the list. In the meanwhile, the following assignment
may be of interest to some of our readers.
Write a "secure" program to add a finite list of
numbers up where "secure" means:
- It always gives the correct answer.
- It only reveals the sum of the numbers as output - and nothing
about the list that generated those numbers.
- If it starts running it is guaranteed to complete its task (unless
the system crashes) - even if it is operating in a timesharing
environment (but one with a fair scheduler and where memory of
one program is not overwriten by another program without
- If you need to specify anything else related to this problem,
do so and meet that specification with your program..