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    In short, I'd say nothing is secure that works as easy as Telegram, WhatsApp, Skype, BlackBerry, etc. All of those (except WhatsApp) have promised end to end encryption, and so far only Telegram is not known to hand over their encryption keys to governments, simply because they are not big enough yet. Somehow Microsoft and Blackberry made it possible to break their own security and provide India and the United Arab Emirates with some plaintext. I wouldn't put it past any app to do this. For real security, use trusted tools like PGP/GPG or OTR.
    – Luc
    Commented Apr 5, 2014 at 19:07
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    They did a roll-your-own on their encryption... So, no. Hilarity from the future, enjoy! Said someone who examined it, "The crypto is like being stabbed in the eye with a fork."
    – Fiasco Labs
    Commented Nov 23, 2015 at 19:03
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    Judging from the fact that the Russian gov won the trial related to the encryption and ordered them to subdue their keys, no.
    – Michael Chourdakis
    Commented Mar 20, 2018 at 17:14
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    As mentioned in the edit here all of this thread should be renamed to just apply to the first version of MTProto. After 2017 it ceased to be relevant.
    – mirh
    Commented Jan 11, 2021 at 13:03