"The problem with encrypting data is that sooner or later, you have to decrypt it. Keep your cloud files cryptographically scrambled using a secret key that only you possess, and it’s likely no hacker will have the codebreaking resources necessary to crack them. But as soon as you want to actually do something with those files—anything from editing a word document or querying a database of financial data—you have to unlock the data and leave it vulnerable. Homomorphic encryption, a still-mostly-theoretical advancement in the science of keeping secrets, could change that (...)"