Cybersecurity Research Institute TOP日本語
  1. Security Fundamentals Laboratory
  2. People
  3. RYOMA ITO

RYOMA ITO

RYOMA ITO

Senior Researcher
Security Fundamentals Laboratory
Cybersecurity Research Institute

Ryoma Ito received a B.E. from the National Defense Academy of Japan in 2009, an M.S. from Japan Advanced Institute of Science and Technology in 2015, and a Ph.D. in Engineering from Osaka University in 2019. From 2009 to 2020, he worked at the Japan Air Self-Defense Force, Ministry of Defense, Japan. Since 2020, he has been a senior researcher at the National Institute of Information and Communications Technology, Japan. His current research interests include the cryptanalysis and design of symmetric key ciphers and security analysis of real-world systems. He was a recipient of the SCIS Paper Award from IEICE in 2016, the CSS Encouragement Research Award from IPSJ in 2021, the SCIS Innovation Paper Award from IEICE in 2022, and the IPSJ Yamashita SIG Research Award in 2023.

Research interests
Cryptanalysis and Design of Symmetric Key Ciphers, Security Analysis of Real-world Systems
Keyword
Symmetric Key Cryptography, Lightweight Cryptography, End-to-End Encryption

Selected papers

  • Takanori Isobe, Ryoma Ito, Fukang Liu, Kazuhiko Minematsu, Motoki Nakahashi, Kosei Sakamoto, and Rentaro Shiba. Areion: Highly-Efficient Permutations and Its Applications to Hash Functions for Short Input. IACR Transactions on Cryptographic Hardware and Embedded Systems, Vol. 2023, Issue 2, pp. 115-154, Mar 2023.
  • Akinori Hosoyamada, Akiko Inoue, Ryoma Ito, Tetsu Iwata, Kazuhiko Minematsu, Ferdinand Sibleyras, and Yosuke Todo. Cryptanalysis of Rocca and Feasibility of Its Security Claim. IACR Transactions on Symmetric Cryptology, Vol. 2022, Issue 3, pp. 123-151, Sep. 2022.
  • Fukang Liu, Willi Meier, Santanu Sarkar, Gaoli Wang, Ryoma Ito, and Takanori Isobe. New Cryptanalysis of ZUC-256 Initialization Using Modular Differences. IACR Transactions on Symmetric Cryptology, Vol. 2022, Issue 3, pp. 152-190, Sep. 2022.
  • Shotaro Miyashita, Ryoma Ito, and Atsuko Miyaji. PNB-focused Differential Cryptanalysis of ChaCha Stream Cipher. In Guomin Yang and Khoa Nguyen, editors, Australasian Conference on Information Security and Privacy - ACISP 2022, volume 13494 of Lecture Notes in Computer Science, pages 46–66. Springer International Publishing, 2022.
  • Keita Emura, Ryoma Ito, Sachiko Kanamori, Ryo Nojima, and Yohei Watanabe. State-free End-to-End Encrypted Storage and Chat Systems based on Searchable Encryption. In Proceedings of the 24th International Conference on Enterprise Information Systems - Volume 2: ICEIS, SCITEPRESS, pages 106-113, 2022.
  • Jin Hoki, Takanori Isobe, Ryoma Ito, Fukang Liu, and Kosei Sakamoto. Distinguishing and Key Recovery Attacks on the Reduced-Round SNOW-V and SNOW-Vi. Journal of Information Security and Applications, vol. 65, no. 103100, Mar. 2022.
  • Takanori Isobe, Ryoma Ito, and Kazuhiko Minematsu. Security Analysis of SFrame. In Elisa Bertino and Haya Shulman, editors, European Symposium on Research in Computer Security - ESORICS 2021, volume 12973 of Lecture Notes in Computer Science, pages 127–146. Springer International Publishing, 2021.
  • Takanori Isobe and Ryoma Ito. Security Analysis of End-to-End Encryption for Zoom Meetings. IEEE Access, vol. 9, pp. 90677-90689, Jun. 2021.
  • Ryoma Ito, Rentaro Shiba, Kosei Sakamoto, Fukang Liu, and Takanori Isobe. Bit-wise Cryptanalysis on AND-RX Permutation Friet-PC. Journal of Information Security and Applications, vol. 59, no. 102860, Jun. 2021.
  • Ryoma Ito. Rotational Cryptanalysis of Salsa Core Function. In Willy Susilo and Robert H. Deng, editors, International Conference on Information Security - ISC 2020, volume 12472 of Lecture Notes in Computer Science, pages 129–145. Springer International Publishing, 2020.

Awards

  • Mar. 2023, IPSJ Yamashita SIG Research Award, Information Processing Society of Japan (IPSJ).
  • Jan. 2022, SCIS Innovation Paper Award, The 39th Symposium on Cryptography and Information Security (SCIS 2021), Institute of Electronics, Information and Communication Engineers (IEICE).
  • Oct. 2021, CSS Encouragement Research Award, Computer Security Symposium 2021 (CSS 2021), IPSJ.
  • Jun. 2021, NICT Outstanding Achievement Award, National Institute of Information and Communications Technology (NICT).
  • Jan. 2016, SCIS Paper Award, The 34th Symposium on Cryptography and Information Security (SCIS 2015), IEICE.
  • Mar. 2015, Best Student Award, Japan Advanced Institute of Science and Technology.
  • Mar. 2009, Best Student Award, National Defense Academy.
Back to the members list
Cybersecurity Research InstituteClick here for other organizations
cybersecurity research institute top
Share this page
back to page top