Talks

Taking Post-Quantum Cryptography from Theory to Practice: A Case Study with Signal.
INDOCRYPT 2025, Keynote Speaker, December 2025. (slides).

The Triple Ratchet Protocol: A Bandwidth Efficient  Hybrid-Secure Signal Protocol.
Real World Crypto, March 2025. (slides).

Post-Quantum Cryptography: The Path From Theory to Practice.
New Concepts and Paradigms of Security for Next Generation 〜Post Quantum, AI and Drones〜, January, 2025. (slides)

Overseas Trends in the Transition to Post-Quantum Cryptography (耐量子計算機暗号への移行に関する海外の動向と課題).
75th ISS Square Suihei Workshop, July, 2024. (slides)

Challenges of Schnorr-like Post-Quantum Blind Signatures.
AB+ Attributes and Blindness, May, 2024. (slides)

CSI-Otter: Isogeny-based (Partially) Blind Signatures from the Class Group Action with a Twist.
22th Forum on Information Technology, September, 2023. (slides)

Challenges and Solutions to Post-Quantum Secure Messaging.
ACNS 2023, Keynote Speaker, June, 2023.  (slides).
The 3rd Yanqi Lake International PQC Standardization and Application Workshop, July, 2023.

Metadata Protection for MLS and Its Variants.
Real World Crypto, March, 2023. (slides, video).

Post-Quantum Cryptography and Secure Messaging. 
MIT Technology Review: Innovators Under 35 Japan Summit 2022 in Nihonbashi, December, 2022. 

A Survey on the NIST PQC Standardization (耐量子計算暗号の標準化動向). 
Hardware Security Forum, December, 2022.

Secure Messaging in a Post-Quantum World. 
PQShield Webinar, November, 2022. 

Revisiting Fuzzy Signatures: Towards a More Risk-Free Cryptographic Authentication System based on Biometrics. 
21th Forum on Information Technology, September, 2022. 

A New Simple Technique to Bootstrap Various Lattice Zero-Knowledge Proofs to QROM Secure NIZKs.
Monash Univsersity, Cybersecurity Seminars, July, 2021. (slides, video).
Workshop on Cryptography and Information Security (WCIS), September, 2021.
Design and Evaluation for New-generation Cryptography,  November. 2021. 

Calamari and Falafl: Logarithmic (Linkable) Ring Signatures from Isogenies and Lattices.
ENS de Lyon/Royal Holloway/CWI Cryptography Seminar, March, 2021. (slides).

Compact NIZKs from Various Assumptions.
MPI/RUB Seminar, December, 2020. (slides).

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).
The Workshop on Modern Trends in Cryptography, June, 2019. (slides).

On the Untapped Potential of Encoding Predicates by Arithmetic Circuits and Their Applications.
NTT-JFLI-U.Tokyo Workshop on Cryptography, January, 2018.
Tokyo Crypto Day, March, 2018. (slides).
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.
ISEC, May, 2017. (slides). 

Lattice IBE without Reduction Loss in the Random Oracle Model.
SCIS/CSS Invited Session in IWSEC, September, 2016.