About Me

  • I’m a researcher of NTT Secure Platform Laboratories, NTT Corporation, Japan from 2012.
  • From July 2019, I’m also a visiting researcher of Ruhr-Universit├Ąt Bochum, Germany.
  • 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 the symmetric-key cryptography.
  • Link : [dblp] [google scholar]
  • Contact address :address

Recent Major Activity

  • The paper “PRINCEv2 – More Security for (Almost) No Overhead” was accepted at SAC2020.
  • The paper “Lower Bounds on the Degree of Block Ciphers” was accepted at Asiacrypt2020.
  • The paper “Improved Differential-Linear Attacks with Applications to ARX Ciphers” was chosen one of the Best Papers Award in CRYPTO 2020.
  • I won the 2019 Fundamentals Review Best Author Award from IEICE.
  • Our paper entitled “Improved Differential-Linear Attacks with Applications to ARX Ciphers” was accepted at CEYPTO2020.
  • Our paper entitled “Out of Oddity – New Cryptanalytic Techniques against Symmetric Primitives Optimized for Integrity Proof Systems” was accepted at CRYPTO 2020.

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

Editorial Board

IACR Transactions on Symmetric Cryptology (ToSC) 2017–2021.
IACR Transactions on Cryptographic Hardware and Embedded Systems (TCHES) 2020–2021.


  • 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