this post was submitted on 15 Sep 2024
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The only way you can do this, is if the only service you use the provider for is storage. Encrypt the data before you send it to the provider and then they don't know what they're storing.
If they have to do any processing on it at all, then conceptually they need a plain text copy of it to feed into the CPU. And if they have that, there is nothing you can do to stop them from stealing it or using it.
There has been some research in this field, the concept is called homomorphic encryption. That is where you encrypt something in a way that allows a third party to manipulate the data without possessing a key. It is still very limited, and likely always will be due to the extreme difficulty of the question.