Encrypting & decrypting sensor data on disk using Zymkey

Yes, I want to use the priv-pub key pair to create and store a secret key and use it for symmetric encryption between two raspberry pi’s with zymbits paired to them. I read on another thread that there is a solution based on the zymkey toolchain to achieve this. Can I have more details on this please?

Link to the thread: Same Encryption key for 2 Zymkeys - #4 by vivekb