Yeah, that's a problem. It is leaking metadata, not content. Ideally, the image should be padded, encrypted with a different key, and given a different URL for

Yeah, that's a problem. It is leaking metadata, not content. Ideally, the image should be padded, encrypted with a different key, and given a different URL for each user who is authorized to view it. But this would increase the client's burden significantly, especially in conversations that include more than two people.