Linked by Thom Holwerda on Tue 25th May 2010 21:37 UTC
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Member since:
2008-10-26
It's called homomorphic encryption ( http://en.wikipedia.org/wiki/Homomorphic_encryption ). Basically, yes, there exist encryption systems such that a remote computer can be given encrypted data and an arbitrary program, convert the program to run on encrypted data, run it, and send back an encrypted result without ever knowing anything about the encrypted data. As that article mentions, such cyptosystems are very recent (the first one was discovered less than a year ago), and their efficiency makes them impracticably slow for many (most?) applications.