Speaker: Dr. XU Yanhong, Research Assistant Professor, Shanghai Jiao Tong University (SJTU)
Date and time: 14:00-15:00, November 10
Venue: SIST 1A 200
Host: ZHANG Liangfeng
Abstract:
Group signature is a privacy preserving primitive that allows a set of users to sign messages on behalf of a group and at same time keeps the users anonymous. In case of dispute, however, there is an opening authority who can open suspicious signatures and identify the signer, thus forcing accountability of the group members. In this talk, Dr. XU will introduce what this primitive is, and a generic way to realize it. Next, she will present a lattice-based instantiation of this protocol and briefly explain why this is secure. After, she would like to show variants and development of group signatures, including the most recent work about multi-modal private signatures by Nguyen et al. at Crypto 2022. She will then conclude the talk with some possible problems.
Biography:
Dr. XU Yanhong is currently a Research Assistant Professor at Shanghai Jiao Tong University. She obtained her PhD from Nanyang Technological University at 2019 and had two year postdoc experience at University of Calgary. Her research interests include privacy-preserving protocols from post-quantum assumptions, in particular lattice-based group signatures.