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End-to-end crypto in Matrix

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Discussion around implementing and using encryption in Matrix via Olm/Megolm | Spec work and reference impl work in #e2e-dev:matrix.org135 Servers

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27 Jun 2020
@david:vovo.id.audavo… are we assuming Alice was a real recipient of Claire's message?11:16:05
@sorunome:sorunome.deSorunome

alice, bob and claire are all in a room

yes

11:16:16
@david:vovo.id.audavo * … are we assuming Alice was a real recipient of Claire's message?11:16:20
@david:vovo.id.audavo
In reply to @sorunome:sorunome.de

alice, bob and claire are all in a room

yes

evidently my comprehension ability fails at Riot's default font size
11:17:04
@sorunome:sorunome.deSorunomexD it's ok11:17:15
@david:vovo.id.audavoanyway uh I have a feeling uhoreg did consider this sort of scenario already11:18:12
@sorunome:sorunome.deSorunomesoru'll leave a comment just in case11:18:30
@sorunome:sorunome.deSorunomeyou'd have to add signatures and stuff to fix that11:18:45
@sorunome:sorunome.deSorunomewhich is a problem not yet solved11:18:51
@david:vovo.id.audavoeven signatures won't help if the proposed scheme doesn't change11:19:16
@david:vovo.id.audavobecause the replay attack still exists11:19:40
@sorunome:sorunome.deSorunomeif alice, bob and claire all had an independent signature key and signed all of their messages with it, not just the megolm signatures, then yes, it would be solved11:19:49
@sorunome:sorunome.deSorunomeohright, you could replay the same thing11:19:56
@sorunome:sorunome.deSorunomesorry, forgot that11:19:58
@sorunome:sorunome.deSorunomethere, posted a lengthy comment on it11:33:47
@sorunome:sorunome.deSorunomehttps://github.com/matrix-org/matrix-doc/pull/1849#discussion_r44651551011:35:02
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