Following on from this post WhatsApp network forensics 2017/06/whatsapp-network-forensics.html you may know WhatsApp changed the protocol to 'Open Whisper System's Signal Protocol end-to-end encryption'. A useful analysis of "Signal" can be found here regarding capturing the “ratcheting” key update structure:
A Formal Security Analysis of the Signal Messaging Protocol
https://eprint.iacr.org/
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