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Nice to meet you! I am Yi-Fu Lai hailing from Taiwan. Since October 2025, I have been working as a post-doc researcher in Frederik Vercauteren’s lab at KU Leuven. See About for more a detailed profile.
News:
2026.01: A paper accepted by Eurocrypt2026.
2026.01: I will serve as PC member for Asiacrypt2026.
2025.10: I join KU Leuven as a post-doc researcher.
If you have any questions or are interested in my research, feel free to reach out to me.
Contact
yi-fulai.lai [at] kuleuven.be ; 27182818284fu.lai [at] gmail com
Publications & Preprints
Eurocrypt2026. Post-Quantum Blind Signature from Standard Group Action Assumptions and More. (To appear).
LEAF: Compact and Efficient Blind Signature from Code-based Assumptions. Yi-Fu Lai, Edoardo Persichetti. (ia.cr/2025/1585)
Asiacrypt2025. Tanuki: New Frameworks for (Concurrently Secure) Blind Signatures from Post-Quantum Groups Actions. Lucjan Hanzlik, Yi-Fu Lai, Marzio Mula, Eugenio Paracucchi, Daniel Slamanig, Gang Tang. (ia.cr/2025/1100)
Hidden Number Problems in Fiat-Shamir based Post-Quantum Signatures. Yi-Fu Lai, Jonas Meers, Julian Nowakowski (ia.cr/2025/913)
(Note) A Note on Isogeny Group Action-Based Pseudorandom Functions. Yi-Fu Lai. (ia.cr/2024/2042)
CiC-2024. Erebor and Durian:Full Anonymous Ring Signatures from Quaternions and Isogenies. Giacomo Borin, Yi-Fu Lai, Antonin Leroux. (ia.cr/2024/1185)
PKC2024. A Simpler and More Efficient Reduction of DLOG to CDH for Abelian Group Actions. Steven Galbraith, Yi-Fu Lai, Hart Montgomery. (ia.cr/2024/191)
PKC2024. Breaking Parallel ROS: Implication for Isogeny and Lattice-based Blind Signatures. Shuichi Katsumata, Yi-Fu Lai, Michael Reichle. (ia.cr/2023/1603)
Indocrypt2023. Malleable Commitments from Group Actions and Zero-Knowledge Proofs for Circuits based on Isogenies. Mingjie Chen, Yi-Fu Lai, Abel Laval, Laurane Marco, Christophe Petit. (ia.cr/2023/1710)
Crypto2023. CSI-Otter: Isogeny-based (Partially) Blind Signatures from the Class Group Action with a Twist. Shuichi Katsumata, Yi-Fu Lai, Jason T. LeGrow, Ling Qin. (ia.cr/2023/1239) Video
CiC-2024. CAPYBARA and TSUBAKI: Verifiable Random Functions from Group Actions and Isogenies. Yi-Fu Lai (ia.cr/2023/182)
ACNS2023. Efficient Isogeny Proofs Using Generic Techniques. Kelong Cong, Yi-Fu Lai, Shai Levin. (ia.cr/2023/037)
PQCrypto2022. Attack on SHealS and HealS: the Second Wave of GPST. Steven Galbraith and Yi-Fu Lai. (ia.cr/2022/443) Video
Eurocrypt2022. Group Signatures and More from Isogenies and Lattices: Generic, Simple, and Efficient. Ward Beullens, Samuel Dobson, Shuichi Katsumata, Yi-Fu Lai, Federico Pintore, (ia.cr/2021/1366) Video
Collusion Resistant Revocable Ring Signatures and Group Signatures from Hard Homogeneous Spaces. Yi-Fu Lai, Samuel Dobson. (ia.cr/2021/1365) (Stop updating due to impracticability.)
Eurocrypt2021. Compact, Efficient and UC-Secure Isogeny-Based Oblivious Transfer. Yi-Fu Lai, Steven Galbraith, Cyprien Delpech de Saint Guilhem,(ia.cr/2020/1012) Video
Journal Articles
CiC-2024. Erebor and Durian:Full Anonymous Ring Signatures from Quaternions and Isogenies. Giacomo Borin, Yi-Fu Lai, Antonin Leroux. Communications in Cryptology 2024. Open Access Link
CiC-2024. CAPYBARA and TSUBAKI: Verifiable Random Functions from Group Actions and Isogenies. Yi-Fu Lai. Communications in Cryptology 2024. Open Access Link
DCC-2024. CSI-Otter: Isogeny-based (Partially) Blind Signatures from the Class Group Action with a Twist. Shuichi Katsumata, Yi-Fu Lai, Jason T. LeGrow, Ling Qin. Designs, Codes and Cryptography, 2024. Springer. Full version of [C:KLLQ23] Open Access Link
DCC-2023. Group Signatures and More from Isogenies and Lattices: Generic, Simple, and Efficient. Ward Beullens, Samuel Dobson, Shuichi Katsumata, Yi-Fu Lai, Federico Pintore. Designs, Codes and Cryptography, 2023. Springer. Full version of [EC:BDKLP22] Open Access Link
Community
Research Visits
We submit so we review. I am happy to contribute to the following peer-review process:
Program Committee:
Asiacrypt2026, Eurocrypt2026, CT-RSA2025, ISC2025
Reviewing for the following conferences:
Asiacrypt2021/ PQCrypto2021/ Eurocrypt2022/ Mathcrypt2022/ AsiaCCS2023/ Eurocrypt2023/ Crypto2023/ Asiacrypt2023/ Mathcrypt2023/ Eurocrypt2024/ Asiacrypt2024/ Eurocrypt2025/ PKC2025/ Crypto2025/ Asiacrypt2025
I have been fortunate enough to visit the following institutes and departments for academic communications:
CISPA, Germany: 31 Mar 2025 - 5 April 2025
Wuhan University, China: 03 Jan 2025 - 13 Jan 2025
AIST, Japan: 22 May 2023 - 20 Jul 2023
IBM Research Zurich, Switzerland: 4 Jul 2022 - 22 Jul 2022
COSIC KU Leuven, Belgium: 21 Jun 2022 - 1 Jul 2022
University of Birmingham: 13 Jun 2022 - 20 Jun 2022
CWI Amsterdam, Netherlands: 3 Jun 2022 - 10 Jun 2022
Available Slides
"Tanuki: New Frameworks for (Concurrently Secure) Blind Signatures from Post-Quantum Groups Actions" @ Link
"Leakage Resilience of Post Quantum Signature -- with a Focus on LESS" @ Link
"A Simpler and More Efficient Reduction of DLOG to CDH for Abelian Group Actions" @ (PKC2024 Link).
"Breaking Parallel ROS: Implication for Isogeny and Lattice-based Blind Signatures." @ (PKC2024 Link).
"CSI-Otter: Isogeny-based (Partially) Blind Signatures from the Class Group Action with a Twist and a New ROS Attack." (Leuven Isogeny Day 4 Link)
"CSI-Otter: Isogeny-based (Partially) Blind Signatures from the Class Group Action with a Twist" (Google Drive Link)
"Attack on SHealS and HealS: the Second Wave of GPST" (PQCrypto2022 Link) in PQCrypto2022 Video
"Group Signatures and More from Isogenies and Lattices: Generic, Simple, and Efficient" (Eurocrypt2022 Link) in Eurocrypt2022 Video
" Compact, Efficient and UC-Secure Isogeny-Based Oblivious Transfer" (Eurocrypt2021 Link) in Eurocrypt2021 Video
Selected Talks/Seminars
Seminar: "Leakage Resilience of Post Quantum Signature -- with a Focus on LESS" @ CISPA, Germany.
Talk: "Leakage Resilience of Post Quantum Signature -- with a Focus on LESS" @PQC Workshop 2024, University of Auckland, New Zealand.
Talk: "A Simpler and More Efficient Reduction of DLOG to CDH for Abelian Group Actions" @ PKC2024, Australia.
Talk: "Breaking Parallel ROS: Implication for Isogeny and Lattice-based Blind Signatures." @ PKC2024, Australia.
Seminar: "A Simpler and More Efficient Reduction of DLog to CDH for Abelian Group Actions" 0328.2023 @ Ruhr-University Bochum, Germany.
Seminar: "A Simpler and More Efficient Reduction of DLog to CDH for Abelian Group Actions" 0229.2023 @ Université libre de Bruxelles, Belgium.
Seminar: "CSI-Otter: Isogeny-based (Partially) Blind Signatures from the Class Group Action with a Twist and a New ROS Attack." 1020.2023 @ CWI seminar, Neatherland.
Talk: "CSI-Otter: Isogeny-based (Partially) Blind Signatures from the Class Group Action with a Twist and a New ROS Attack." 1013.2023 @ KU Leuven, Belgium. (Leuven Isogeny Day 4)
Seminar: "CSI-Otter: Isogeny-based (Partially) Blind Signatures from the Class Group Action with a Twist" 0623.2023 @ University of Birmingham seminar, UK.
Seminar: "Isogeny-based Cryptosystems (with a Focus on Blind Signature)." 0616.2023 @ AIST, Japan.
Talk: "Attack on SHealS and HealS: the Second Wave of GPST." @ PQCrypto2022, Online.
Talk: "Group Signatures and More from Isogenies and Lattices: Generic, Simple, and Efficient." 0707.2022 @ IBM Zurich, Switzerland.(An Ordinary Day in Supersingularland)
Talk: "Attack on SHealS and HealS: the Second Wave of GPST." 0630.2022 @ COSIC-KU Leuven, Belgium.
Talk: "Group Signatures and More from Isogenies and Lattices: Generic, Simple, and Efficient." 0613.2022 @ University of Birmingham, UK.
Talk: "Group Signatures and More from Isogenies and Lattices: Generic, Simple, and Efficient." @ Eurocrypt2022, Norway.
Seminar: "Group Signatures and More from Isogenies and Lattices: Generic, Simple, and Efficient." 0610.2022 @ CWI Amsterdam, Netherlands.
Talk: "Compact, Efficient and UC-Secure Isogeny-Based Oblivious Transfer." @ Eurocrypt2021, Croatia.
Talk: "Compact, Efficient and UC-Secure Isogeny-Based Oblivious Transfer." May 2021 @ University of Auckland.
Seminar: in a team. / Talk: more open or larger.
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