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WhatsApp provides no cryptographic management for group messages
The weakness creates the possibility of an insider or hacker adding rogue members.
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 made the finding 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.
