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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
Sptember 2025: A international conference paper has been accepted to ACSAC 2025.
Gravity of the Situation: Security Analysis on Rocket.Chat E2EE
September 2025: A journal paper has been accepted to IACR Communications in Cryptology.
Exploring SHA Instructions and Its Application to AES-based Schemes
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
Studies on Cryptanalysis of Symmetric-Key Cryptography
Studies on Design of Symmetric Key Ciphers
Studies on Security Analysis of Real-world Systems
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
Local Organizing Chair: ACNS 2023, ACNS 2021
Publicity Chair: ISPEC 2022
Awards
Awards
2026: SCIS Paper Award, SCIS 2025, ISEC group of IEICE, Japan.
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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