In the case of Telegram, MTProto’s implementation leaves a lot to be desired[1][2]. Additionally, home rolled crypto does not usually get the kind of security

In the case of Telegram, MTProto’s implementation leaves a lot to be desired[1][2]. Additionally, home rolled crypto does not usually get the kind of security review from the cryptography community which makes it very likely that bugs of all kinds exist. [1] https://words.filippo.io/dispatches/telegram-ecdh/ https://words.filippo.io/dispatches/telegram-ecdh/ [2] http://unhandledexpression.com/2013/12/17/telegram-stand-back-we-know-maths/ http://unhandledexpression.com/2013/12/17/telegram-stand-bac...