In mid-March, during the FBI vs. Apple scandal surrounding the encrypted San Bernardino iPhone, a report revealed that security researchers from Johns Hopkins University were able to access photos and videos in iMessage conversations, even though they were encrypted. The same university came up with a different attack against the same iMessage, one that allowed them to access content that should be protected by the strong encryption Apple advocates.
The good news is the security holes have been patched already. You just have to run the latest versions of iOS and OS X. However, the researchers recommend that Apple should replace its iMessage encryption with one that eliminates potential weaknesses. More →