Seminar Details

End-to-end encryption is increasingly adopted in all kinds of communication, including secure messaging, video, audio, email, file sharing, and web browsing. As end-to-end encrypted systems expand and grow, so too do the needs and challenges for content moderation in these systems. This talk systematizes the study of content moderation under end-to-end encryption, including user reporting, metadata-based moderation, and automated content scanning with various client privacy guarantees. We identify a key distinction in the goals of various E2EE content moderation system between protecting users from content they do not want, and detecting groups of colluding users sending content the platform does not wish to host. We also identify several areas of future research in E2EE content moderation, especially creating better tools for transparency, verification, and auditability of these systems.