Android System Key Verifier has actually been available as a separate app before. Now, right from the Messages app, you and a contact will be able to scan QR codes to verify each other as contacts.

Key Verifier uses QR codes to authenticate encrypted messages. To use it, users open a conversation in Google Messages, tap a ...

Google is changing the way you confirm if contacts are legit. The company has begun rolling out a QR code to verify that the person you're communicating with is, in fact, who they say they are, ...