It’s called iMessage Contact Key Verification and allows users to verify that they are messaging only the people they intend to chat with.
The feature also alerts users if someone starts eavesdropping on their messages.
Apple’s iMessage is perhaps one of the most popular messaging apps out there. Even though it’s restricted to iOS users and hasn’t let in the Android crowd yet, it offers some of the best chat and security features. End-to-end encryption has been a part of iMessage since the launch of the service, but Apple is making it even more secure with a new feature.