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

arXiv:2607.27510 · cs.CR · Submitted 2026-07-29 · Read on arXiv

Gabriel K. Gegenhuber, Moritz Grefner, Maximilian Günther, Matthäus Wininger, David Schmidt, Aljosha Judmayer

cs.CR

Submitted: 2026-07-29

Comments: Accepted to USENIX Security 2026; Artifacts available at https://github.com/sbaresearch/transcript-consistency

Journal ref: USENIX Security 2026

Code: https://github.com/sbaresearch/transcript-consistency

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

Terminology

Consistency — 48× in this paper · explained in 3 episodes
Fingerprinting — 4× in this paper · explained in 2 episodes
Verification — 4× in this paper · explained in 2 episodes
Causal Transcript Consistency — 3× in this paper
Messaging Layer Security — 3× in this paper
Off-the-Record Messaging — 3× in this paper
Participant Transcript Consistency — 3× in this paper
Set Transcript Consistency — 3× in this paper
Total Transcript Consistency — 3× in this paper
Adam — 2× in this paper · explained in 2 episodes
Robustness — 2× in this paper · explained in 5 episodes
Actor — 1× in this paper · explained in 3 episodes
Adaptation — 1× in this paper · explained in 1 episode
Network and Distributed System Security Symposium — 1× in this paper
Proof of Concept — 1× in this paper
Trace — 1× in this paper · explained in 2 episodes

Sources

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