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Is Telegram really an encrypted messaging app?
(blog.cryptographyengineering.com)
This is a most excellent place for technology news and articles.
It doesn't matter what Facebook or WhatsApp say they use, their source code is closed, you can't prove their words, meaning they don't have e2ee. You can with Signal, you can with Telegram.
Telegram needs to enable e2ee by default, cause the way it is now, you may as well not have it.