RFC 9420 or how to scale end-to-end encryption with Messaging Layer Security - media.ccc.de
https://media.ccc.de/v/37c3-12064-rfc_9420_or_how_to_scale_end-to-end_encryption_with_messaging_layer_security
https://media.ccc.de/v/37c3-12064-rfc_9420_or_how_to_scale_end-to-end_encryption_with_messaging_layer_security