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WhatsApp is probably backdoored though, so your end to end encryption will only keep your internet café from spying on you, not the governments Facebook is friendly with: https://appleinsider.com/articles/17/01/13/whatsapp-backdoor...

You mean the the one reported by theGuardian? The one where they could not find a second security researcher to agree about? The one this public letter was about? https://techcrunch.com/2017/01/20/security-researchers-call-...

Oh, never saw that retraction even before when I Googled it.

Good catch!

Is Viber even End to End encrypted at all?

Supposedly.

https://www.viber.com/blog/2018-01-28/your-data-is-protected...

https://www.viber.com/blog/2016-04-19/giving-our-users-contr...

Just one remark: Viber/WhatsApp client's code is closed, where is the guarantee that they do not have some "backdoor" to the client's chat right in the application?

Ah apologies, I thought Telegram was more used than that there.