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crepererum (crepererum@mastodon.online)'s status on Tuesday, 16-Apr-2024 19:22:12 JST

crepererum (crepererum@mastodon.online)'s status on Tuesday, 16-Apr-2024 19:22:12 JST crepererum
in reply to
@stillgreenmoss @ben @delta @besendorf FWIW both "group chats + FS" and "open protocol" are now solved by MLS ( https://datatracker.ietf.org/doc/html/rfc9420 ). I think the issue of most chat-oriented protocols is that they don't map to "email" very well, since emails are basically "fire and forget", so key exchanges are harder/slower.
In conversation about 7 months ago from social.076.moe permalink
Attachments
1. RFC 9420: The Messaging Layer Security (MLS) Protocol
  
  from Katriel Cohn-Gordon
  
  Messaging applications are increasingly making use of end-to-end security mechanisms to ensure that messages are only accessible to the communicating endpoints, and not to any servers involved in delivering messages. Establishing keys to provide such protections is challenging for group chat settings, in which more than two clients need to agree on a key but may not be online at the same time. In this document, we specify a key establishment protocol that provides efficient asynchronous group key establishment with forward secrecy (FS) and post-compromise security (PCS) for groups in size ranging from two to thousands.

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