> No, because if the party you're messaging has iCloud backup on (a good chance), or is on Android, or has their device physically accessed somehow- a third par

> No, because if the party you're messaging has iCloud backup on (a good chance), or is on Android, or has their device physically accessed somehow- a third party can read all of the messages that you sent them. There is no 'true privacy' This is surely true no matter how strong the encryption scheme, though. If you share your content with anyone else, then your security is only as strong as theirs.