In what form are viber messages transmitted in an open network?

Question

WiFi

Now, as I understand it, with the introduction of version 6.x.x, the end-to-end encryption function is enabled. And in previous versions (as I understand it, version 5 is still popular on some versions of android and ios) in what form were messages transmitted, for example, in an open WI-FI network?

Answer 1

Most likely in an unencrypted form over the SSL protocol - https://www.anti-malware.ru/news/2013-05-15/11776
In the WiFi network, these messages are not visible in the open, since SSL is used.
The essence of the introduced encryption is that messages can no longer be decrypted on Viber servers.