The world has been abuzz for weeks now about the inclusion of a journalist in a group message of senior White House officials discussing plans for a military strike. In that case, the breach was the result of then-National Security Advisor Mike Waltz accidentally adding The Atlantic Editor-in-Chief Jeffrey Goldberg to the group chat and no one else in the chat noticing. But what if someone controlling or hacking a messenger platform could do the same thing?

When it comes to WhatsApp—the Meta-owned messenger that’s frequently touted for offering end-to-end encryption—it turns out you can.

A clean bill of health except for...

A team of researchers confirmed that behavior in a recently released formal analysis of WhatsApp group messaging. They reverse-engineered the app, described the formal cryptographic protocols, and provided theorems establishing the security guarantees that WhatsApp provides. Overall, they gave the messenger a clean bill of health, finding that it works securely and as described by WhatsApp.

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