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Whatsapp asynchronous messaging and calling use different protocols for communication. For messaging it uses XMPP and for VoIP it uses SRTP for multimedia communication. Both can be distinguished by their different traffic fingerprints. SRTP uses UDP as transport protocol and media elements are end-to-end encrypted. While directly analysing the UDP header ...


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ISPs in general can detect VoIP connections because these network flows in general have specific network metrics such as , constant rate, a relationship between up stream and downstream and some more. However, some applications such Skype the embed all encrypted traffic on one network flow, make impossible to know how many messages has been sent. In the case ...


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Normally DNS traffic is in clear and can easily be sniffed by the ISP (just sniff port 53), making it possible to create user profiles. And not only could the traffic be sniffed but it could also be redirect to the ISP's DNS server in order to give a different answer. This is a typical way to block domains at the ISP level. DoH uses HTTPS for transport and ...


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