Comment by Arn_Thor
1 month ago
They don’t send the photo. They send some encrypted metadata to which some noise is added. The metadata can be loosely understood as “I have this photo that looks sort of like this”. Then the server takes that encrypted data from the anonymized device and responds something like “that looks like the Eiffel Tower” and sends it back to the device. The actual photo never goes to the server.
With the added caveat that HE is magic sauce - so the server cannot see the metadata (cropped/normalized image data), and doesn't know how much it does or does not look like the Eiffel Tower.