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by mort96 374 days ago
I don't think you want to look at the source code, and I don't think you want to look at Telegram. You should have a look at the Signal Protocol: https://en.m.wikipedia.org/wiki/Signal_Protocol. It's well documented. Maybe there are libraries which implement it.

(Though I still think that "how can I protect against TLS being broken?" is the wrong question and you should instead ask "how can I ensure that TLS doesn't break?".)