应我校科研处、网络空间安全学院邀请，英国萨里大学田阳光博士将于2026年1月5日（周一）为我校做学术报告，欢迎广大师生参加！报告的具体安排如下：

报告时间：2026年1月5日（周一）9:00-12:00

报告地点：东区教学楼 网络空间安全学院FZ555会议室

报告题目：FABS: Fast Attribute-based Signatures

报告摘要：Attribute-based signatures (ABS) provide fine-grained control over who can generate digital signatures and have many real-world applications. This paper presents a pair of fast ABS schemes: one for Key-Policy ABS (KP-ABS) and another for Signature-Policy ABS (SP-ABS). Both schemes support expressive policies using Monotone Span Programs (MSP), and offer practical features such as large universe, arbitrary attributes, and adaptive security. Most notably, we provide the first implementation of MSP-based ABS schemes and demonstrate that our schemes achieve the best-known asymptotic and concrete performance in this domain. Asymptotically, key generation, signing and verification time scale linearly with the number of attributes; verification requires only two pairing operations. In concrete terms, for 100 attributes, our KP-ABS scheme performs key generation, signing, and verification in 0.16s, 0.10s, and 0.13s, respectively; our SP-ABS scheme achieves times of 0.082s, 0.26s, and 0.21s for the same operations.

报告人简介：Yangguang Tian is currently a lecturer at the University of Surrey. Dr. Tian received his PhD degree in applied cryptography from University of Wollongong, Australia. After PhD, he did post-docs at School of Information Systems, Singapore Management University, and iTrust, Singapore University of Technology and Design. Before Surrey, he was a research-based assistant professor at Osaka University, Japan. Dr. Tian’s research mainly focuses on applied cryptography, particularly includes authenticated key exchanges, privacy-preserving authentications, chameleon hashes and attribute-based encryptions. Dr. Tian has published 50+ research articles at top-tier cybersecurity international conferences and journals, and the recent ones include ACSAC’20, (Asia) CCS’24, USENIX’24, IEEE TIFS’24, IEEE TDSC’24, and CANS’25. Dr. Tian was involved in two EU Horizon projects, SECANT and EUTRUST. Dr. Tian also served PC members and reviewers for cybersecurity-related conferences and journals. The recent ones include ICICS’25, Inscrypt’25, ProvSec’25, ACM WPES’25, and SiMLA’25 (as programme chair).