Send and Pretend: Exploiting Transcript Consistency Issues in End-to-End Encrypted Group Chats

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arXiv:2607.27510v1 Announce Type: new Abstract: End-to-end encrypted (E2EE) messaging apps are widely praised for their security and thus also used for sensitive coordination in group chats (e.g., by political decision makers). After Threema and WhatsApp, also Signal and iMessage have recently introduced polls to aid agreement processes in groups. This implicitly sets the expectation that all participants see the same outcome and thus have the same view of the conversation. This property is com