About Me

  • I’m a distinguished researcher of NTT Social Informatics Laboratories (formerly, NTT Secure Platform Laboratories), NTT Corporation, Japan.
  • I joined NTT Corporation in 2012.
  • From 2019 to 2020, I was visiting researcher at Ruhr-university Bochum.
  • I received my Ph.D. from Kobe University in March 2017 (supervisor: Masakatu Morii).
  • The title of my Ph.D. Thesis is “Integral Cryptanalysis against Symmetric-Key Cryptosystems.”
  • My research area is cryptography. Especially, the design and analysis of symmetric-key cryptography.
  • Link : [dblp] [google scholar]

Recent Major Activity

  • The paper “New Attacks from Old Distinguishers, Improved Attacks on Serpent” was accepted at CT-RSA 2022. 
  • The paper “Perfect Trees: Designing Energy-Optimal Symmetric Encryption Primitives” was accepted at ToSC 2021, No. 4. 
  • The paper “Strong and Tight Security Guarantees against Integral Distinguishers” was accepted at Asiacrypt 2021.
  • The paper “Massive Superpoly Recovery with Nested Monomial Predictions” was accepted at Asiacrypt 2021.
  • The paper “Designing S-boxes Providing Stronger Security against Differential Cryptanalysis for Ciphers Using Byte-Wise XOR” was accepted at SAC2021.
  • The paper “Modeling for Three-Subset Division Property without Unknown Subset” was published at Journal of Cryptology.

Please check the page for publication list in detail.


  • Sep. 2020, IEICE Fundamentals Review Best Author Award, IEICE
  • Aug. 2020, CRYPTO 2020 Best Paper Award, IACR.
  • Jun. 2019, IEICE Best Papers Award, IEICE.
  • Jan. 2016, SCIS Best Papers Award, SCIS 2015, ISEC, IEICE.
  • Aug. 2015, CRYPTO 2015 Best Paper Award, IACR.
  • Aug. 2015, CRYPTO 2015 Best Young Researcher Award, IACR.

Program Committee

ASIACRYPT: 2016, 2018
CHES: 2021, 2022
Eurocrypt: 2016, 2020
FSE: 2018, 2019, 2020, (2021), 2022
Latincrypt: 2019
Selected Areas in Cryptography (SAC): 2019, 2020, 2021

Editorial Board

IACR Transactions on Symmetric Cryptology (ToSC) 2017–2022.
IACR Transactions on Cryptographic Hardware and Embedded Systems (TCHES) 2020–2022.


  • 2021 Trivium-LE, Low-Energy Stream Ciphers
  • 2021 Sycon v2, Lightweight Cryptographic Permutation
  • 2020 Prince v2, Low-Latency Block Cipher
  • 2017 Gimli, Cross-Platform Cryptographic Permutation
  • 2017 GIFT, Lightweight Block Cipher
  • 2014 Minalpher, Authenticated Encryption with Associated Data