Can I secretly add numbers in a smart contract and only add sum

Question

here is what I have. I have 4 nodes in which each node sends a number. Each number should not be visible to any node other than the owner. The smart contract should secretly add all 4 numbers without viewing them to any member. Only the result which is the summation should be visible

Answer 1

In am not sure about that, but asymmetric keys could be way to do it. As the nodes use public key to encrypt their number, and only smart contract have the key to decrypt it.