打击加密信息系统中的错误信息
讲座时间：2025-06-16 09:00讲座地点：立人楼A108
讲座内容：
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.
特邀专家：
Guoming Yang，应用密码学领域的国际知名专家，聚焦网络安全、云计算、区块链等方向，提出多项具有影响力的密码协议与加密原语。其研究成果被国际标准（ISO/IEC 11770-7:2021）采纳，并在CRYPTO、IEEE S&P、NDSS、ACM ASIACCS、IEEE TIFS、TDSC 等国际顶级会议与期刊上发表论文百余篇。其代表性成果包括匿名签名、逆向防火墙、可追踪匿名数字货币等，解决了多个密码学长期难题，推动了多项关键技术的实用化。
