Derek and Zak confirm they are talking to each other using the Diffie-Hellman protocol. Zak then encrypts a secret message using RSA encryption, which Derek then decrypts.
The Art of the Problem has a fantastic pair of videos on YouTube explaining how these encryption methods both work.
RSA Encryption: https://www.youtube.com/watch?v=wXB-V_Keiu8
The podcast lives at https://www.thehyperfine.com/
Join our listener community on Reddit at https://www.reddit.com/r/TheHyperfine/
Derek on Twitter:
Zak on Twitter: