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UID:pretalx-pts2025-7K9MEV@cfp.pass-the-salt.org
DTSTART;TZID=CET:20250703T153500
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DESCRIPTION:Twelve years after the public specification of the Signal proto
 col\, almost all\ninstant messaging protocols have embraced the ratchet co
 nstruct\, granting perfect\nforward secrecy and post-compromise security.\
 n\nWhatsapp\, Signal\, OMEMO-based applications\, Olm and Megolm-based app
 lications\,\nor SimpleX Chat all use the Double Ratchet protocol. Olvid al
 so uses a ratchet\nprotocol\, although the construct is a bit different. A
 nd there are the stragglers\nwho insist on not using any form of perfect f
 orward secrecy\, such as Session or\nDelta Chat. Of those\, we will talk n
 o more.\n\nBut since then\, we have learned the hard way from some NSA exe
 cutive that\nmetadata gets you arrested or killed. And so begs the questio
 n: how well are\nprotected our metadata by the various instant messaging i
 nfrastructures?\n\nSignal claims one cannot hand over data one doesn't hav
 e. But how honest are\nthey about the metadata they do have\, and that cou
 ld be requested from them or\ntheir hosting provider by a subpoena and sea
 led orders.\n\nIn this talk\, we will explore some metadata available to S
 ignal servers\, Olvid\nservers\, Matrix/Element home servers and SimpleX C
 hat SMP queue servers. We will\nthen discuss the strategies that some of t
 hese applications have deployed to\nlimit metadata exposition\, including 
 those leveraging external transport security\,\nsuch as the use of Tor.
DTSTAMP:20260316T021330Z
LOCATION:Amphitheater 122
SUMMARY:Metadata Protection in Instant Messaging Applications: a Review - F
 lorian Maury
URL:https://cfp.pass-the-salt.org/pts2025/talk/7K9MEV/
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