Conversation:
Notices
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OTOH: @WilliamTurton writes "…there’s no backdoor in WhatsApp, and according to Alec Muffett, an experienced security researcher who spoke to Gizmodo, the Guardian’s story is “major league fuckwittage.”" http://gizmodo.com/theres-no-security-backdoor-in-whatsapp-despite-report-1791158247
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But that re-keying attack seems like an easily fixed design flaw. The keys are already separate from the hardware, so a "clean" hardware replacement should include a transfer of key material from the old hardware to the new hardware so that re-keying queued messages is not necessary. Of course, now there's the vulnerability of exposing key material during the transfer, but that co…
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The security flaw is not in Moxie's Axolotl protocol, but in the #WhatsApp implementation. Signal software doesn't have this flaw, it doesn't automatically re-key messages and just refuse to deliver. I doubt Moxie has control over the WhatsApp implementation.
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I'm no fan of Moxie's position on keeping Signal in a non- #FAIF silo. Yes, federating a communications medium is hard; and federating a communications medium *securely* may only be possible for sufficiently low values of "secure".
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@hobbsc @thomask Last word goes to Moxie: https://whispersystems.org/blog/there-is-no-whatsapp-backdoor/