*Please call me "Shu" for short. Pronounced exactly like "shoe".
I'm a cryptography researcher at National Institute of Advanced Industrial Science and Technology (AIST), Japan. I'm also affiliated with PQShield as a research consultant.
My main research topics include, but not limited to, lattices-based crypto, identity-based encryptions, group/attribute-based signatures, zero-knowledge proofs, and so on.
I'm always thrilled, excited, and motivated to discuss any interesting problems with other researchers so please let me know if you are interested!!
Contact: shuichi.katsumata000 [at] gmail.com OR shuichi.katsumata [at] aist.go.jp
ASIACRYPT 2020. To Appear.
ASIACRYPT 2020. ePrint.
ASIACRYPT 2020. ePrint.
CRYPTO 2020. ePrint.
Exposing Private User Behaviors of Collaborative Filtering via Model Inversion Techniques. Seira Hidano, Takao Murakami, Shuichi Katsumata, Shinsaku Kiyomoto, Goichiro Hanaoka.
PETS/PoPETS 2020. To Appear.
Non-Interactive Zero-Knowledge in Pairing-Free Groups from Weaker Assumptions. Geoffroy Couteau, Shuichi Katsumata, Bogdan Ursu.
PKC 2020. ePrint.
ESORICS 2019. ePrint.
Group Signatures without NIZK: From Lattices in the Standard Model. Shuichi Katsumata, Shota Yamada.
EUROCRYPT 2019. ePrint.
Non-Zero Inner Product Encryption Schemes from Various Assumptions: LWE, DDH and DCR. Shuichi Katsumata, Shota Yamada.
PKC 2019. ePrint.
PKC 2019. ePrint.
ASIACRYPT 2018. (Invited to Journal of Cryptography.) ePrint.
Attribute-Based Signatures for Unbounded Languages from Standard Assumptions. Yusuke Sakai, Shuichi Katsumata, Nuttapong Attrapadung, Goichiro Hanaoka.
ASIACRYPT 2018. ePrint.
Attribute-Based Signatures for Unbounded Circuits in the ROM and Efficient Instantiations from Lattices. Ali El Kaafarani, Shuichi Katsumata.
PKC 2018. ePrint.
Anonymous Reputation Systems Achieving Full Dynamicity from Lattices. Ali El Kaafarani, Shuichi Katsumata, Ravital Solomon.
FC 2018. Preproceeding.
On the Untapped Potential of Encoding Predicates by Arithmetic Circuits and Their Applications. Shuichi Katsumata.
Model Inversion Attacks for Prediction Systems: Without Knowledge of Non-Sensitive Attributes. Seira Hidano, Takao Murakami, Shuichi Katsumata, Shinsaku Kiyomoto, Goichiro Hanaoka.
PST 2017. Proceeding.
Partitioning via Non-linear Polynomial Functions: More Compact IBEs from Ideal Lattices and Bilinear Maps. Shuichi Katsumata, Shota Yamada.
Robust Cost Sensitive Support Vector Machine. Shuichi Katsumata, Akiko Takeda.
AISTATS 2015. Proceedings.
Constructing Subspace Membership Encryption through Inner Product Encryption. Shuichi Katsumata, Noboru Kunihiro.
ProvSec 2014. Proceedings.
Theoretical Computer Science, Volume 809, 2020. Elsevier. (Full version of [KMT19@PKC]).
IEICE Transactions E101-D(11), 2018. (Full version of [HMKKH18@PST]).
IEICE Transactions E100-A(9), 2017. (Full version of [KK14@ProvSec]).
Exploring Constructions of Compact NIZKs from Various Assumptions.
Workshop on Cryptography and Information Security (WCIS), September, 2019. (slides).
Exploring Links Between Lattice-based NIZKs and Various Signature Schemes (in the Standard Model).
On the Untapped Potential of Encoding Predicates by Arithmetic Circuits and Their Applications.
NTT-JFLI-U.Tokyo Workshop on Cryptography, January, 2018.
ISEC, May, 2018.
Partitioning via Non-linear Polynomial Functions: More Compact IBEs from Ideal Lattices and Bilinear Maps.
10th Workshop on Public Key Cryptography: Secure Constructions and Its Applications, February, 2017.
Lattice IBE without Reduction Loss in the Random Oracle Model.
SCIS/CSS Invited Session in IWSEC, September, 2016.
CRYPTO, EUROCRYPT, ASIACRYPT, TCC, PKC, ACNS, PQCrypto, ACISP, APKC, IWSEC, DCC, etc...
Full time researcher at the National Institute of Advanced Industrial Science and Technology (AIST).
Research consultant at PQShield.
Director's Award, Graduate School of Frontier Sciences, The University of Tokyo. May, 2019.
Invited to Journal of Cryptography from ASIACRYPT 2018.
Tsujii Shigeo Security Award, 2018.
Computer Security Symposium 2017 (CSS2017), Best Student Paper Award.
Research Fellowships for Doctoral Scientists, Japan Society for the Promotion of Science (JSPS). 2017.
Tsujii Shigeo Security Award, 2017.
Symposium on Cryptography and Information Security 2016 (SCIS 2016), Best Paper Award.