In this blog post I take a detailed look at how the Extended Triple Diffie-Hellman Key Exchange (X3DH) works.
This algorithm is part of the cryptography that drives OMEMO. https://blog.jabberhead.tk/2019/04/04/shaking-hands-with-omemo-x3dh/
Shaking Hands With OMEMO: X3DH – vanitasvitae's blog

vanitasvitae's blog
@vanitasvitae why would you illustrate this with a picture from the memorial to the Murdered Jews of Europe though? 🤔
@vanitasvitae thanks for writing this. I am so frustrated by poor #OMEMO interoperatbility between ChatSecure and Conversations!