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.

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, ...

Google’s new Recovery Contact feature lets a trusted friend help you regain access to your account if you get locked out.