How do you keep the messages in a group chat secure? Messaging layer security (MLS). The Double Ratchet algorithm provides end-to-end encryption for text messages between two people. But securing a group chat is much harder. MLS is the first standardized multi-party “key exchange” — a protocol for communication among groups of people or devices. Resources: Video on the Double Ratchet algorithm: https://www.youtube.com/watch?v=7uEeE3TUqmU MLS Working Group: https://messaginglayersecurity.rocks/ Created by Kelsey Houston-Edwards Graphics by Ray Lux Sponsored by Wire https://wire.com/ Thanks to Britta Hale for the helpful conversation about MLS