Messaging layer security: Encrypting a group chat
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Published 2022-08-06
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: • Double ratchet algorithm: The ping-po...
MLS Working Group: messaginglayersecurity.rocks/
Created by Kelsey Houston-Edwards
Graphics by Ray Lux
Sponsored by Wire wire.com/
Thanks to Britta Hale for the helpful conversation about MLS
All Comments (12)
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So easy to understand the concepts and see deeper into the space of problems and solutions. Awesome!! Thanks!
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Great set of videos
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Thank you for this and the other video, Im currently making a chat app and couldnt find any good videos explaining group encryption
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Perfection!
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Amazing.
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It is unclear how F gets its private key at 6'16''. It is also unclear why the rachet can go up the tree as well as down the tree.
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root key doesn't change but all the members need to maintain the state of the modified ratcheted key? when a user joins? because if they don't keep track of it, same modified key could be derived from the original root key? That just means changing the root key, with new derived key? I got that 100% wrong, but I don't understand
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How to expand the tree when new users join in? I mean I can make a work around, but what is the standard way? from the video, I'm pretty sure I misunderstood, when a new user is added to the existing empty nodes, the user recieves a welcome message with modified root key? So the new user will never know the original root key? How could the new user encrypt then? I don't think with a modified root key is possible to encrypt and decrypt with the original root key, because others have it
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HELP
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Epic? Quit saying epic. Its clearly the other pronunciation. Because your way of doing it is ambiguous with another word.
