How safe is telegram?
Telegram is safe as far as your mobile operator is safe, because of SMS authentication. Telegram allows you to protect against this by setting an additional password, but by default it is not used. End-to-end encryption. The procedure for reconciling the key is not at all straightforward. Each time the key imprint is different. It is not clear on what channels it is intended to verify it. There is no way to once verify the chat key, in the future to check its authenticity yourself, as in the case of OTR. In the end, despite the fact that Telegram is done very well, and in most cases much safer and more convenient than analogues, it can not be called a qualitatively different solution from competitors. This is all the same commercial product, which carries threats to freedom of communication.
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