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Senior Researcher,
Security Fundamentals Laboratory,
Cybersecurity Research Institute,
National Institute of Information and Communications Technology.
4-2-1, Nukui-Kitamachi, Koganei, Tokyo 184-8795, Japan
Contact: itorym (at) nict.go.jp
News
News
August 2025: A journal paper has been accepted to Journal of Information Security and Applications (IF: 3.7).
Parallel SAT Framework to Find Clustering of Differential Characteristics and Its Applications
August 2025: A journal paper has been accepted to IACR Transactions on Symmetric Cryptology.
Divide-and-Conquer SAT for Exploring Optimal Differential and Linear Characteristics and Its Applications
May 2025: Our talk has been accepted to Black Hat USA 2025 Briefings.
Not Sealed: Practical Attacks on Nostr, a Decentralized Censorship-Resistant Protocol
February 2025: A journal paper has been accepted to Journal of Information Security and Applications (IF: 3.8).
On the Effects of Neural Network-based Output Prediction Attacks on the Design of Symmetric-key Ciphers
February 2025: I have been invited to serve on the editorial board for IACR ToSC 2025/2026.
February 2025: An international conference paper has been accepted to IEEE EuroS&P 2025.
Not in The Prophecies: Practical Attacks on Nostr
December 2024: A journal paper has been accepted to Journal of Information Security and Applications (IF: 3.8).
Security Analysis of SFrame
Education
Education
2017-2019: Ph.D. in Engineering, Osaka University, Japan (Supervisor: Prof. Atsuko Miyaji).
A Study on Statistical Cryptanalysis of Stream Ciphers [Doctoral Dissertation] [Ph.D. Defense]
2013-2015: Master's Degree in Information Science, Japan Advanced Institute of Science and Technology, Japan (Supervisor: Prof. Atsuko Miyaji).
2005-2009: Bachelor's Degree in Science and Technology, National Defense Academy, Japan.
Work Experiences
Work Experiences
2020-present: Senior Researcher, Security Fundamentals Laboratory, Cybersecurity Research Institute, National Institute of Information and Communications Technology, Japan.
2025-present: Guest Associated Professor, Graduate School of Information Science and Technology, The University of Osaka, Japan,
2025-present: Part-time Lecturer, Department of Information Science, Faculty of Science, Toho University, Japan.
2009-2020: Information and Communications Officer, Kokujieitai (Japan Air Self-Defense Force), Ministry of Defense, Japan.
Research Interests
Research Interests
Cryptanalysis of Symmetric Key Ciphers
Analysis on block ciphers
Neural netweork-based output prediction attacks on AES, PRESENT, Simon, and TWINE
SAT-based differential attacks on PRINCE and QARMA
Analysis on stream ciphers
Statistical cryptanalysis on RC4
Rotational attacks on Salsa
Differential attacks on Salsa and ChaCha
Differential and integral attacks on SNOW-V and SNOW-Vi
Differential attacks on ZUC-256
Analysis on hash functions
Rebound attacks on AES-DM
Analysis on AEADs
Analysis on the initial version of Rocca
Analysis on key committing security of AEZ, Adiantum, and HCTR2
Analysis on cryptographic permutations
Rotational, differential, and integral attacks on Friet-PC
Design of Symmetric Key Ciphers
Areion: ultra low-latency permutation and its applications to hash functions and AEADs
Security Analysis of Real-world Systems
Statistical analysis and plaintext recovery attacks on RC4 under WPA-TKIP
Analysis of end-to-end encryption (E2EE)
Analysis of E2EE for Zoom meetings
Analysis of SFrame, E2EE framework for real-time communications
Analysis of Nostr, an open-source distributed network protocol for distributed social networking services
Development of an encrypted system with keyword search (ESKS)
Professional Activities
Professional Activities
Editorial Board: ToSC 2025/2026, ToSC 2024/2025, ToSC 2023/2024, ToSC 2022/2023
Program Committee: FSE 2026, FSE 2025, ISC 2024, ACISP 2024, ADSC 2024, FSE 2024, ADSC 2023, FSE 2023
Publication Chair: IWSEC 2024
Publicity Chair: ISPEC 2022
Awards
Awards
2025: SCIS Innovation Paper Award, SCIS 2024, ISEC group of IEICE, Japan.
2024: CSS Paper Award, IPSJ, Japan.
2024: CSS Ethical Practice Award, IPSJ, Japan.
2023: CSS Student Paper Award, IPSJ, Japan.
2023: JIP Specially Seleceted Paper certificate, IPSJ, Japan.
2023: IPSJ Yamashita SIG Research Award, IPSJ, Japan.
2022: SCIS Innovation Paper Award, SCIS 2021, ISEC group of IEICE, Japan.
2021: CSS Encouragement Research Award, CSS 2021, CSEC group of IPSJ, Japan.
2016: SCIS Paper Award, SCIS 2015, ISEC group of IEICE, Japan.
2015: Best Student Award, Japan Advanced Institute of Science and Technology, Japan.
2009: Best Student Award, National Defense Academy, Japan.
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