Secure multiparty computation
- Person 1 selects a large random number, add secret to it
- Each other member add to it and pass it around
- Person 1 gets the sum + random and subtrac the random
- Not secure
- Obtain average number among n party using secret shares.
- Partition each secret number into n parts give n-1 to the other parties.
- Each party add up their parts and announce it.
- Add up all the parts and divide by n to get the average.