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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?

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