TLS is supposed to protect data in-flight, but the data is known to both parties. iMessage was advertised to protect the user's message in such a way that even

TLS is supposed to protect data in-flight, but the data is known to both parties. iMessage was advertised to protect the user's message in such a way that even Apple couldnt't read them, even if they stage a man-in-the-middle attack. (disclosure: I have not read the article)