36C3 - What's left for private messaging?

https://media.ccc.de/v/36c3-10565-what_s_left_for_private_messaging It is easier to chat online securely today than it ever has been. Widespread adoption of signal, wire, and the private mode of WhatsApp have led a broader recognition of the importance of end-to-end encryption. There's still plenty of work to be done in finding new designs that balance privacy and usability in online communication. This introduction to secure messaging will lay out the different risks that are present in communications, and talk about the projects and techniques under development to do better. The talk will begin with a threat modeling exercise to be able to concretely talk about the different actors and potential risks that a secure messaging system can attempt to address. From there, we'll dive into end-to-end encryption, OTR and deniability, and then the axolotl construction used by Signal (and now the noise framework). The bulk of the talk will focus on the rest of the problem which is more i