Send and Pretend: Exploiting Transcript Consistency Issues in End-to-End Encrypted Group Chats
Following earlier findings in Threema and WhatsApp, researchers now show Signal and iMessage also suffer transcript-consistency flaws in E2EE group chats, enabling a server to show different messages to different participants.
Summary written by editorial AI · Source link below
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
Editorial Analysis
Executives and boards increasingly rely on E2EE group chats for sensitive decisions; if a compromised server can make participants see different messages, coordinated decision-making integrity is at risk.
Brief leadership on transcript-consistency risks in E2EE group messaging and consider out-of-band message verification for critical decisions.
Major E2EE messaging platforms including Signal and iMessage have group-chat integrity flaws that could let a compromised server manipulate what each participant sees.
Forward-looking interpretation drafted by editorial AI under human review — not a reproduction of the source. See methodology.
External link — opens at arXiv Crypto & Security in a new tab.
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