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  1. rugk -> ⚠️ Follow me at https://social.wiuwiu.de/@rugk (rugk@gnusocial.de)'s status on Friday, 28-Jul-2017 13:54:57 UTC rugk -> ⚠️ Follow me at https://social.wiuwiu.de/@rugk rugk -> ⚠️ Follow me at https://social.wiuwiu.de/@rugk
    • Verschlüsselung
    • Threema
    More is Less: How group chats weaken the security of instant messengers #Signal, #WhatsApp and !threema https://eprint.iacr.org/2017/713.pdf

    TL;DR: Attackers can often rewind members of group to previous state (replay attack), WhatsApp can add arbitrary users and thus circumvent #e2e crypto in all group chats easily.

    BTW: #Threema fixed the issues, WhatsApp ignored, Signal wants to introduce a new protocol in the future.

    /cc !verschluesselung
    In conversation Friday, 28-Jul-2017 13:54:57 UTC from gnusocial.de permalink

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