About Myself

Contact

Adress:

1-5, Yamadaoka, Suita-shi, Osaka, 565-0871, Japan.

Email:

yamashita AT ist DOT osaka-u DOT ac DOT jp

Experience

5/2022-present:

Assistant professor in Osaka University, Japan.

4/2021-4/2022:

Postdoctoral researcher in Cyber Physical Security Research Center, AIST, Japan.

5/2020-3/2021:

Research assistant in Cyber Physical Security Research Center, AIST, Japan.

4/2018-3/2021:

PhD student in Department of Social Informatics, Graduate School of Informatics, Kyoto University, Japan.

4/2015-3/2018:

Business person (not a researcher) in NTT west, Japan.

Journal Articles

[J12]

Kazuma Shiraishi, Keisuke Hara, Toi Tomita, Kyosuke Yamashita and Junji Shikata, "Homomorphic Signature With Designated Evaluator," IEEE Access, vol. 13, pp. 23950-23958, 2025.

[J11]

Chihiro Kado, Naoto Yanai, Jason Paul Cruz, Kyosuke Yamashita, Shingo Okamura, "Empirical Study of Impact of Solidity Compiler Updates on Vulnerabilities in Ethereum Smart Contracts", Distributed Ledger Technologies Research and Practice, 2024.

[J10]

Koki Tejima, Kyosuke Yamashita, Naoto Yanai, Shingo Okamura, "A Study on Privacy-Preserving Face Authentication with Secure Computation", IPSJ transactions. TDP, vol. 5（4）, pp. 62-75, 2024.

[J9]

Mine Arai, Koki Tejima, Yuya Yamada, Takayuki Miura, Kyosuke Yamashita, Chihiro Kado, Rei Shimizu, Masataka Tatsumi, Naoto Yanai, Goichiro Hanaoka, "REN-AI: A Video Game for AI Security Education Leveraging Episodic Memory", IEEE Access, vol. 12, pp. 47359-47372, 2024.

[J8]

Chika Komiya, Naoto Yanai, Kyosuke Yamashita, Shingo Okamura, "JABBERWOCK: A Tool for WebAssembly Dataset Generation and Its Application to Malicious Website Detection", Journal of Information Processing, 2024, Vol. 32, pp. 298-307.

[J7]

Kyosuke Yamashita, Keisuke Hara, "On the Black-Box Impossibility of Multi-Designated Verifiers Signature Schemes from Ring Signature Schemes," Journal of Mathematical Cryptology, vol. 18, no. 1, 2024, pp. 20230028.

[J6]

Ryu Ishii, Kyosuke Yamashita, Zihao Song, Yusuke Sakai, Tadanori Teruya, Goichiro Hanaoka, Kanta Matsuura and Tsutomu Matsumoto “Constraints and Evaluations on Signature Transmission Interval for Aggregate Signatures with Interactive Tracing Functionality” IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences, 2024, Vol.E107-A, No.4, pp.619-633.

[J5]

Kyosuke Yamashita, Keisuke Hara, Yohei Watanabe, Naoto Yanai, Junji Shikata, “Designated Verifier Signature with Claimability,” IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences, 2024, Vol.E107-A, No.3, pp.203-217

[J4]

Kyosuke YAMASHITA, Ryu ISHII, Yusuke SAKAI, Tadanori TERUYA, Takahiro MATSUDA, Goichiro HANAOKA, Kanta MATSUURA, Tsutomu MATSUMOTO, "Fault-Tolerant Aggregate Signature Schemes Against Bandwidth Consumption Attack", IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences, 2023, Vol.E106.A, No.9, pp.1177-1188.

[J3]

Ryu ISHII, Kyosuke YAMASHITA, Yusuke SAKAI, Tadanori TERUYA, Takahiro MATSUDA, Goichiro HANAOKA, Kanta MATSUURA and Tsutomu MATSUMOTO, "Aggregate Signature Schemes with Traceability of Devices Dynamically Generating Invalid Signatures", IEICE Transactions on Information and Systems, 2022, Vol.E105.D, No.11, pp. 1845-1856.

[J2]

Kyosuke Yamashita, Mehdi Tibouchi and Masayuki Abe, "On The Impossibility of NIZKs for Disjunctive Languages from Commit-and-Prove NIZKs", IEEE Access, 2021. [ieeexplore]

[J1]

Kyosuke Yamashita, Mehdi Tibouchi, and Masayuki Abe, "A Coin-Free Oracle-Based Augmented Black Box Framework (Full Paper)", IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences, Vol.E103-A, No.10, pp.1167-1173, Oct. 2020.

Conference Proceedings Articles

[C14]

Yuuki Fujita, Keisuke Hara, Kyosuke Yamashita, "Claimable Multi-designated Verifier Signature," ProvSec2025, pp. 23-43.

[C13]

Yuya Takeuchi, Haruki Yonekura, Kyosuke Yamashita, Hirozumi Yamaguchi, "Evaluating Attribute Inference Risks in Urban Care Taxi Arrival Time Prediction Models Using Geospatial Data," The 14th International Workshop on Urban Computing, held in conjunction with the 31st ACM SIGKDD 2025.

[C12]

Yuuki Fujita, Yusuke Sakai, Kyosuke Yamashita, and Goichiro Hanaoka, "On Key Substitution Attacks against Aggregate Signatures and Multi-Signatures, In Proceedings of the 12th ACM ASIA Public-Key Cryptography Workshop (APKC '25). Association for Computing Machinery, New York, NY, USA, 54–63.

[C11]

K. Hashimoto, K. Yamashita and K. Hara, "Foundations of Multi-Designated Verifier Signature: Comprehensive Formalization and New Constructions in Subset Simulation," in 2025 IEEE 38th Computer Security Foundations Symposium (CSF), Santa Cruz, CA, USA, 2025, pp. 174-189.

[C10]

Eri Nakajima, Keisuke Hara and Kyosuke Yamashita, "On Multi-Key FuncCPA Secure Encryption Schemes," 2024 1st International Conference On Cryptography And Information Security (VCRIS), Hanoi, Vietnam, 2024, pp. 1-6.

[C9]

Takumi Matsuura, Keisuke Hara and Kyosuke Yamashita. 2024. Designated Verifier Signature with Repudiability. In Proceedings of the 11th ACM Asia Public-Key Cryptography Workshop (APKC '24). Association for Computing Machinery, New York, NY, USA, 32-41.

[C8]

Masahiro Kamimura, Kyosuke Yamashita, Naoto Yanai, "Generic Construction of Key-Aggregate Searchable Encryption," In Proceedings of the 1st ACM SIGSPATIAL International Workshop on Geo-Privacy and Data Utility for Smart Societies (GeoPrivacy '23). Association for Computing Machinery, New York, NY, USA, 1–4.

[C7]

Kyosuke Yamashita, Keisuke Hara, “On the Black-Box Impossibility of Multi-Designated Verifiers Signature Schemes from Ring Signature Schemes,” Collectio Ciphrarum - Proceedings of cryptographic conferences and workshops 2023, 2023, pp. 1249-1249. [eprint]

[C6]

C. Komiya, N. Yanai, K. Yamashita and S. Okamura, "JABBERWOCK: A Tool for WebAssembly Dataset Generation towards Malicious Website Detection," 2023 53rd Annual IEEE/IFIP International Conference on Dependable Systems and Networks Workshops (DSN-W), Porto, Portugal, 2023, pp. 36-39.

[C5]

Kyosuke Yamashita, Keisuke Hara, Yohei Watanabe, Naoto Yanai, and Junji Shikata. 2023. Designated Verifier Signature with Claimability. In Proceedings of the 10th ACM Asia Public-Key Cryptography Workshop (APKC '23). Association for Computing Machinery, New York, NY, USA, 21–32.

[C4]

Ryu Ishii, Kyosuke Yamashita, Zihao Song, Yusuke Sakai, Tadanori Teruya, Goichiro Hanaoka, Kanta Matsuura and Tsutomu Matsumoto "Constraints and Evaluations on Signature Transmission Interval for Aggregate Signatures with Interactive Tracing Functionality. ADIoT 2022: 51-71

[C3]

Ryu Ishii, Kyosuke Yamashita, Yusuke Sakai, Takahiro Matsuda, Tadanori Teruya, Goichiro Hanaoka, Kanta Matsuura and Tsutomu Matsumoto "Aggregate Signature with Traceability of Devices Dynamically Generating Invalid Signatures", ACNS Workshops 2021: 378-396

[C2]

Kyosuke Yamashita, Mehdi Tibouchi and Masayuki Abe "On Black-Box Extension of a Non-Interactive Zero-Knowledge Proof System for Secret Equality", INDOCRYPT 2020: 882-904

[C1]

Kyosuke Yamashita, Mehdi Tibouchi and Masayuki Abe "A Coin-Free Oracle-Based Augmented Black Box Framework", ProvSec2019. [ePrint]