If you believe that amazon are potentially an adversary, but you still want to host it on their servers, there is essentially nothing you can do to stop them ge

If you believe that amazon are potentially an adversary, but you still want to host it on their servers, there is essentially nothing you can do to stop them getting at your data. At some point, to process the data, you have to do that unencrypted. That is an unpluggable achilles heel.