I'm a cryptography researcher at PQShield under the supervision of Shuichi Katsumata. I'm also a collaborative researcher at the National Institute of Advanced Industrial Science and Technology (AIST). I hold a PhD degree from the University of Electro-Communications, Japan.
I have mainly worked on classical and (lattice-based) post-quantum aggregatable signatures, e.g., aggregate signatures, multi-signatures, and threshold signatures during my PhD. I'm very interested in various topics of cryptography. In particular, my recent interests include, without limitation, threshold cryptography, password-based protocols, interactive protocols, and so on.
Contact: kaoru.takemure [at] pqshield.com / kaoru.takemure [at] gmail.com
my dblp and google scholar
2025:
"Unmasking TRaccoon: A Lattice-Based Threshold Signature with An Efficient Identifiable Abort Protocol"
Rafael del Pino, Shuichi Katsumata, Guilhem Niot, Michael Reichle, Kaoru Takemure
Crypto 2025.
2024:
"Adaptively Secure 5 Round Threshold Signatures from MLWE/MSIS and DL with Rewinding"
Shuichi Katsumata, Michael Reichle, Kaoru Takemure
Crypto 2024
"Two-Round Threshold Signature from Algebraic One-More Learning with Errors"
Thomas Espitau, Shuichi Katsumata, Kaoru Takemure
Crypto 2024 (slides)
"Tighter Adaptive IBEs and VRFs: Revisiting Waters’ Artificial Abort"
Goichiro Hanaoka, Shuichi Katsumata, Kei Kimura, Kaoru Takemure, Shota Yamada.
TCC 2024 (slides)
2020:
"Achieving Pairing-Free Aggregate Signatures using Pre-Communication between Signers"
Kaoru Takemure, Yusuke Sakai, Bagus Santoso, Goichiro Hanaoka, Kazuo Ohta
ProvSec 2020
2024:
"More Efficient Two-Round Multi-Signature Scheme with Provably Secure Parameters for Standardized Elliptic Curves."
Kaoru Takemure, Yusuke Sakai, Bagus Santoso, Goichiro Hanaoka, Kazuo Ohta
IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences
2021:
"Achieving Pairing-Free Aggregate Signatures using Pre-Communication between Signers."
Kaoru Takemure, Yusuke Sakai, Bagus Santoso, Goichiro Hanaoka, Kazuo Ohta
IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences
"Cryptanalysis of Aggregate Γ-Signature and Practical Countermeasures in Application to Bitcoin."
Goichiro Hanaoka, Kazuo Ohta, Yusuke Sakai, Bagus Santoso, Kaoru Takemure, Yunlei Zhao
ePrint
"Two-Round Threshold Signature from Algebraic One-More Learning with Errors"
- Workshop on Cryptography and Information Security (WCIS), September, 2024
- ENSL/CWI/KCL/IRISA Joint Online Cryptography Seminars, November, 2024, (slides)
Doctoral Course Research Fellowships, Japan Society for the Promotion of Science (JSPS), 2022