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Cryptography Engineering
Isobe Laboratory
Graduate School of Information Science and Technology
The University of Osaka
News
2026.08
Papers
A paper by alumnus Sasaki, alumnus Utsumi, D2 student Taka, Specially Appointed Researcher Ishikawa, Guest Associate Professor Ito, Guest Associate Professor Sakamoto, and Professor Isobe has been accepted for the international conference ASIACRYPT 2026.
Tatsuya Ishikawa, Takanori Isobe, Ryoma Ito, Kosei Sakamoto, Kosuke Sasaki, Kazuma Taka, Shion Utsumi, "Finding Collisions for HMAC-SHA Forgery in the Secret-State Setting"
2026.08
Research Activities
Specially Appointed Researcher Urushigaki presented the following paper at the international conference USENIX WOOT 2026 held in Baltimore, USA.
Kota Urushigaki, Hayato Kimura, Atsushi Tanaka, Takanori Isobe, "Practical Attacks on a Decentralized Secure Messenger Session"
2026.08
Papers
A paper by M2 student Morita, Specially Appointed Researcher Ishikawa, D2 student Shiraya, Guest Associate Professor Sakamoto, Guest Associate Professor Ito, and Professor Isobe has been accepted for the international conference CANS 2026.
Kento Morita, Tatsuya Ishikawa, Takuro Shiraya, Kosei Sakamoto, Ryoma Ito, Takanori Isobe, "Accelerated Differential Search for Gleeok Using Hamming-Weight-Guided SAT Solving"
2026.08
Papers
A paper by alumnus Fujita, Associate Professor Hara, and Guest Associate Professor Yamashita has been accepted for publication in the IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences.
Yuuki Fujita, Keisuke Hara, Keitaro Hashimoto and Kyosuke Yamashita, "Multi-Designated Verifier Ring Signature: Generic Construction from Standard Primitives"
2026.07
Research Activities
D2 student Shiraya and Guest Associate Professor Sakamoto presented the following papers at the international conference ACISP 2026 held in Perth, Australia.
Taichi Nagoya, Takuro Shiraya, Kazuma Taka, Tatsuya Ishikawa, Kosei Sakamoto, Ryoma Ito, Takanori Isobe, "Analyzing Forgery Security of LeMac: Tight Bounds and Impact of Padding" Keita Toyama, Kosei Sakamoto, Ryoma Ito, Kazuma Taka, Kodai Taiyama, Takanori Isobe, "Automated Tool for Finding Practical Collisions on SPN-based Hash Functions"
2025.12
Papers
A paper by Professor Isobe has been accepted for publication in the International Association for Cryptologic Research’s journal IACR Communications in Cryptology (CIC).
Kazuhiko Minematsu, Tomoyasu Suzaki, Mostafizar Rahman, Sahiba Suryawanshi, Takanori Isobe, "MSX: Lightweight Block Ciphers for Microcontrollers with High-assurance against Differential and Linear Attacks"
2025.12
Papers
A paper by Professor Isobe has been accepted for publication in the International Association for Cryptologic Research’s journal IACR Communications in Cryptology (CIC).
Sajani Kundu, Avik Chakraborti, Shibam Ghosh and Takanori Isobe, "EWEMrl: A White-Box Secure Cipher with Longevity"
2025.11
Papers
A paper by alumnus Nakata, Specially Appointed Researcher Ishikawa, Guest Researcher Sakamoto, Guest Associate Professor Ito, and Professor Isobe has been accepted for publication in the International Association for Cryptologic Research's journal Transactions on Symmetric Cryptology (ToSC) 2025.
Subhadeep Banik, Tatsuya Ishikawa, Takanori Isobe, Ryoma Ito, Kazuhiko Minematsu, Kazuma Nakata, Mostafizar Rahman and Kosei Sakamoto, "Dialga: A Family of Low-Latency Tweakable Block Ciphers using Multiple Linear Layers"
2025.09
Papers
A paper by D1 student Kimura, Guest Associate Professor Ito and Professor Isobe has been accepted for publication in the international conference ACSAC 2025.
Hayato Kimura, Ryoma Ito, Kazuhiko Minematsu and Takanori Isobe, "Gravity of the Situation: Security Analysis on Rocket.Chat E2EE"
2025.09
Papers
A paper by D1 student Shiraya, Specially Appointed Researcher Ishikawa, Specially Appointed Researcher Tanaka, Guest Researcher Sakamoto, Guest Associate Professor Ito, and Professor Isobe has been accepted for publication in the International Association for Cryptologic Research's journal IACR Communications in Cryptology 2025.
Takuro Shiraya, Subhadeep Banik, Tatsuya Ishikawa, Ryoma Ito, Mostafizar Rahman, Kosei Sakamoto, Atsushi Tanaka, Shion Utsumi and Takanori Isobe, "Exploring SHA Instructions and Its Application to AES-based Schemes"
Our laboratory conducts cutting-edge research in cryptographic technologies and information security. We actively collaborate with universities, companies, and research institutes both domestically and internationally, promoting a broad spectrum of research from theoretical foundations to practical implementations. Students pursue independent research topics in an environment that fosters proactive learning and lively discussions with supervisors and fellow researchers.
Isobe Lab.
Cryptography Engineering - Isobe Laboratory
Multimedia Engineering, Graduate School of Information Science and Technology
The University of Osaka
1-5 Yamadaoka, Suita
Osaka 565-0871, Japan
Graduate School of Information Science and Technology, The University of Osaka
takanori.isobe(at)ist.osaka-u.ac.jp
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