Fig. 3.

Privacy-preserving schemes. a Secure multi-party computation. In security sharing, security values (blue and yellow pie) are split into any number of shares that are distributed among the computing nodes. During the computation, no computation node is able to recover the original value nor learn anything about the output (green pie). Any nodes can combine their shares to reconstruct the original value. b Differential privacy. It guarantees that anyone seeing the result of a differentially private analysis will make the same inference (answer 1 and answer 2 are nearly indistinguishable)