> I take an authentic image with a camera, crop out the part of it that it's not aligned with my goals If it is cropped, then it would not be provably authenti

> I take an authentic image with a camera, crop out the part of it that it's not aligned with my goals If it is cropped, then it would not be provably authentic. So anyone seeing it, could see that it is modified. > how do you solve the problem of a powerful entity telling you that the cropped image is authentic Well, because you can check. You verify the image yourself, see that it is not authenticated, and then you know.