iMessage is, as far as anyone knows, end-to-end encrypted.* There is a macOS client, so it seems likely that any backdoor in the encryption would have been foun

iMessage is, as far as anyone knows, end-to-end encrypted.* There is a macOS client, so it seems likely that any backdoor in the encryption would have been found via diassembly by now. * looks like Apple is trusted for key discovery. Abuse of this trust could be tested with the Mac iMessage client. That can’t detect a targeted attack, of course, but I don’t think that’s what you’re claiming is happening.