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Also WhatsApp is closed-source, but Telegram's client is open-source.

Telegram is actually not open, they just throw some sources to github or as zip files at their's langing page. That's why i quit Telegram and built open source "Telegram" - https://actor.im and replaced spagetti-encryption with enhanced version of Signal's one.

Considering it is pretty much the gold standard for crypto, how did you enhance it?

We added one extra level based on Russian encryption. So if Curve25519 or AES encryption will be broken there are still be russian level. To break our crypto Russia and US need to cooperate that is impossible.

Not everything with Telegram is open source like Signal. I still use Telegram because it's designed better and updated much more frequently.

I'm using both, too. :) But unfortunately I don't use Chrome, so I can't use Signal on my PC yet.

There are some FF-related pull requests on GitHub, but it seems that guy hasn't signed the contributor agreement. Maybe we'll get an FF-version soon.

Why is a contributor agreement needed? Can you post the link to the PR?

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