On Building Blind Digital Signatures from Supersingular Isogenies
- LecturerDr. Yi-Fu Lai (Ruhr University Bochum)
Host: Bo-Yin Yang - Time2023-09-25 (Mon.) 10:00 ~ 12:00
- LocationAuditorium 101 at IIS
Abstract
We construct the first provably-secure isogeny-based (partially) blind signature scheme. While at a high level the scheme resembles the Schnorr blind signature, our work does not directly follow from that construction, since isogenies do not offer as rich an algebraic structure. Specifically, our protocol does not fit into the linear identification protocol abstraction introduced by Hauck, Kiltz, and Loss (EUROCYRPT’19), which was used to generically construct Schnorr-like blind signatures based on modules such as classical groups and lattices. Consequently, our scheme does not seem susceptible to the recent efficient ROS attack exploiting the linear nature of the underlying mathematical tool.
BIO
Yi-Fu Lai received Ph.D. degree in the Department of Mathematics in the University of Auckland from 2020 to 2023. His main research interest lies in constructing cryptosystems that are provably secure from post-quantum assumptions. In pursuit of this goal, he also enjoys exploring the limits of the cryptographic tools and doing cryptographic analysis and reductions.