The MIT Media Lab and two bitcoin experts have unveiled a prototype encryption system that lets you share it with a third party (or be computed with), without anyone else decrypting it. It means untrusted computers could still be tasked with dealing with sensitive data, but without putting said data at any risk. The trick is called homomorphic encryption, which MIT's Guy Zyskind compares to a black box: "You send whatever data you want, and it runs in the black box and only returns the result. The actual data is never revealed." It does this by hacking up the data into pieces and randomly spreading parts across hundreds of computers in the Enigma (the name of the prototype) network.