http://it.slashdot.org/story/11/08/09/0159225/Microsoft-Demonstrates-Practical-Homomorphic-Computing
"Homomorphic computing makes it possible to compute with encrypted data and get an encrypted result, something that could make cloud services more secure. Such systems have so far been mathematical proofs, but researchers at Microsoft now say that stripped down versions able to only compute certain mathematical functions are efficient enough to be used today. They built prototype software capable of calculating statistical functions using encrypted data and say it could be used for processing medical data while protecting privacy."
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