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How do you encrypt a group chat? The Double Ratchet algorithm provides end-to-end encryption for messaging services, like Signal and WhatsApp, but only when two people are chatting back and forth. It efficiently updates the keys in such a way that an attacker would have very limited access. Even if they were able to read a single message, they couldnt read any previous messages a property known, confusingly, as forward security. And they couldnt read too many future messages. Theyd eventually be locked out again a property known as post-compromise security. But its only set up for two people. How do we get the same thing for group messages? The same security features? Instead of end-to-end encryption, we want end-to-end-to-end-to-end-to-end encryption. Turns out, thats a lot harder. I recommend that you watch the video on the Double Ratchet algorithm, linked in the description,before watching this one. Its not necessary, but itll help. One option is to think of a gr
