Apple to Add Manual Authentication to iMessage

Signal has had the ability to manually authenticate another account for years. iMessage is getting it:

The feature is called Contact Key Verification, and it does just what its name says: it lets you add a manual verification step in an iMessage conversation to confirm that the other person is who their device says they are. (SMS conversations lack any reliable method for verification­—sorry, green-bubble friends.) Instead of relying on Apple to verify the other person’s identity using information …

account apple authenticate authentication called conversation device feature imessage iphone key name signal verification