Not necessarily - if you do the encryption on the client and only ever transmit encrypted data, then even an insider can not learn much about your data. But thi

Not necessarily - if you do the encryption on the client and only ever transmit encrypted data, then even an insider can not learn much about your data. But this may be difficult and/or impractical. You can not easily search your emails if Microsoft only stores an encrypted copy. It might work better for storing your files on SkyDrive. What we really need is practical fully homomorphic encryption [1]. [1] http://en.wikipedia.org/wiki/Homomorphic_encryption http://en.wikipedia.org/wiki/Homomorphic_encryption