See Enigma [1] and homomorphic encryption for a related concept: The key new utility Enigma brings to the table is the ability to run computations on data, wit

See Enigma [1] and homomorphic encryption for a related concept: The key new utility Enigma brings to the table is the ability to run computations on data, without having access to the raw data itself. For example, a group of people can provide access to their salary, and together compute the average wage of the group. Each participant learns their relative position in the group, but learns nothing about other members’ salaries. It should be made clear that this is only a motivating example. In practice, any program can be securely evaluated while maintaining the inputs a secret. [1] http://enigma.media.mit.edu/enigma_full.pdf http://enigma.media.mit.edu/enigma_full.pdf