Isobe Laboratory

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"

D1 student Kimura delivered the following talk at Black Hat USA 2025 Briefings, an industry-focused international cybersecurity conference held in Las Vegas. (This year’s Black Hat USA received 1,143 submissions and accepted 93, making it the most competitive edition to date with an acceptance ratio of over 12 to 1.)

Hayato Kimura, Ryoma Ito, Kazuhiko Minematsu, Shogo Shiraki and Takanori Isobe, "Not Sealed: Practical Attacks on Nostr, a Decentralized Censorship-Resistant Protocol" [slide deck]

A paper by D1 student Taka, 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.

Kazuma Taka, Kosei Sakamoto, Ryoma Ito, Rentaro Shiba, Shion Utsumi and Takanori Isobe, "Divide-and-Conquer SAT for Exploring Optimal Differential and Linear Characteristics and Its Applications"

A paper by M2 student Fujita and Assistant Professor Yamashita has been accepted for the international conference ProvSec 2025.

Yuuki Fujita, Keisuke Hara, Kyosuke Yamashita, "Claimable Multi-Designated Verifier Signature"

M2 student Kawakami and M2 student Sasaki presented the following paper at the international conference ACISP 2025 held in Wollongong, Australia.

Shoma Kawakami, Kazuma Taka, Atsushi Tanaka, Tatsuya Ishikawa and Takanori Isobe, "Strengthening Key Scheduling of AES-256 with Minimal Software Modifications" Kosuke Sasaki, Rikuto Kurahara, Kosei Sakamoto and Takanori Isobe, "Forgery Attacks on SipHash"

D1 student Kimura presented the following paper at the international conference IEEE Euro S&P 2025 held in Venice, Italy.

Hayato Kimura, Ryoma Ito, Kazuhiko Minematsu, Shogo Shiraki and Takanori Isobe, "Not in The Prophecies: Practical Attacks on Nostr"

A paper by Assistant Professor Yamashita has been accepted for presentation at the UrbComp 2025 workshop of the international conference KDD 2025.

Yuya Takeuchi, Haruki Yonekura, Kyosuke Yamashita, and Hirozumi Yamaguchi, "Evaluating Attribute Inference Risks in Urban Care Taxi Arrival"

A paper by M2 student Toyama, Guest Researcher Sakamoto, and Professor Isobe has been accepted for presentation at the international conference SAC 2025.

Keita Toyama, Kosei Sakamoto, Takanori Isobe, "Collision Attacks on SPONGENT with Grouping Method"

A paper by D1 student Shiraya, alumnus Shiraki, Guest Researcher Sakamoto, and Professor Isobe has been accepted for publication in the IEICE Transactions.

Takuro Shiraya, Kosei Sakamoto, Takanori Isobe, "SAT-based Differential Analysis of Initialization Phase of AEGIS/Tiaoxin-346/Rocca/Rocca-S" Shogo Shiraki, Takanori Isobe, "Comprehensive Security Evaluation on End-to-End Encryption of Zoom Mail"

A paper by D1 student Shiraya, Guest Researcher Sakamoto, and Professor Isobe has been accepted for publication in the Journal of Information Processing.

Takuro Shiraya, Kosei Sakamoto, Takanori Isobe, "Differential Analysis of Encryption and Finalization Phases of AES-based AEAD Schemes"