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Telegram CEO Pavel Durov Arrested in France
(www.reuters.com)
This is a most excellent place for technology news and articles.
Where did you get that the data on the servers are not encrypted?
You are, ahem, not decrypting it when getting history and not encrypting it when uploading files. That should be sufficient.
Anyway, look at TG Desktop sources. They are crap, but in general it's clear what happens there. At least that's how I remember it.