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Re:Ask HN: What encrypted chat application to choose? by wrboyce on Saturday December 20, 2014 @09:18AM (#8776672)
Are there any practical examples of Telegram's protocol being broken?
Re:Ask HN: What encrypted chat application to choose? by maxerickson on Saturday December 20, 2014 @09:25AM (#8776690)
According to their docs, the server can MITM encrypted chats.

https://core.telegram.org/techfaq#man-in-the-middle-attacks

After that, if both clients trust the server software,

Re:Ask HN: What encrypted chat application to choose? by owly on Saturday December 20, 2014 @03:30PM (#8777820)
>Are there any practical examples of Telegram's protocol being broken?

Telegram has a $300K reward for anyone able to break it and demostrate it.