Screenshot der verlinkten Website End-to-end Encryption (E2EE) over ActivityPub Encrypted direct messages supply the confidence that people need to connect with family, friends and colleagues privately over a social network. As part of the Summer of Protocols 2024, we explore the integration of end-to-end encryption (E2EE) into the ActivityPub protocol. We conduct a review of encryption protocols and integration architectures, and selected Messaging Layer Security (MLS). We also considered the user experience, ensuring that key management, message archiving, and the handling of mixed encrypted and unencrypted messages would be intuitive and user-friendly. Deliverables Proposed integration of Messaging Layer Security (MLS) into ActivityPub User interface specification for a reference implementation Software architecture for a reference implementation