@tao some of the points of that article don't apply to Telegram and my point is not "Telegram protocol is secure" but "it's not less secure than the industry ones".
NSA had backdoors built-in into crypto algorithms that was audited by international authorities.
So the most logical way for Telegram was to roll its own assuming they were able to do so, and this was the case thanks to Pavel's brother, Nikolai Durov, being a prize-winner mathematician.
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