打擊加密信息系統中的錯誤信息
講座時間：2025-06-16 09:00講座地點：立人樓A108
講座內容：
End-to-end encrypted messaging systems obstruct content moderation. As a result, misinformation proliferates in these systems, thereby exacerbating online hate and harassment. In this talk, we first review several proposals, such as Message Traceback and Source Tracing, that aim to mitigate the spread of misinformation in encrypted messaging systems. We then introduce a new tracing paradigm called Impact Tracing, which reveals influential spreaders central to disseminating misinformation while providing privacy protection for non-influential users. The experimental results show that Impact Tracing can identify the most influential spreaders with accuracy from 82% to 99% while achieving low messaging latency and storage overhead.
特邀專家：
Guoming Yang，應用密碼學領域的國際知名專家，聚焦網絡宁静、雲計算、區塊鏈等偏向，提出多項具有影響力的密碼協議與加密原語。其研究结果被國際標准（ISO/IEC 11770-7:2021）采納，並在CRYPTO、IEEE S&P、NDSS、ACM ASIACCS、IEEE TIFS、TDSC 等國際頂級會議與期刊上發表論文百余篇。其代表性结果包罗匿名簽名、逆向防火牆、可追蹤匿名數字貨幣等，解決了多個密碼學長期難題，推動了多項關鍵技術的實用化。
