EDBT 2026 Demo / reviewers in the wild / expert
Ryuya Hayashi
dblp:362/7175
· DBLP profile ↗
8ranked-venue papers
4as first author
8since 2021 · last 2026
—ORCID · none
Domains — the database's venue-derived domains; a paper can count in several
Security and privacy · 8 · 4 first-author · 8 since 2021Software engineering, systems software and programming languages · 1 · 1 since 2021
| Year | Publication | Venue | Position |
|---|---|---|---|
| 2026 | Attribute-Based Signatures for Circuits with Optimal Parameter Size from Standard Assumptions
Ryuya Hayashi, Yusuke Sakai 0001, Shota Yamada 0001 |
PKC (3) | 1 |
| 2025 | Interoperability between Permissioned Distributed Ledgers without External Trust Anchor
Iifan Tyou, Ryuya Hayashi, Kanta Matsuura |
ICBC | 2 |
| 2025 | CHOO-PIR: Hint-Based Private Information Retrieval with Commodity ServersabstractIn private information retrievals (PIRs), a client retrieves an entry from a database without letting the database server know which entry is retrieved. Recently, hint-based PIRs were proposed, where the client receives some hints about the database in the setup phase before the actual query begins. As an advantage, these PIRs achieve sublinear database server online computation. On the other hand, the client needs to preprocess the hints with the database server, which can be costly. Moreover, the client needs to store some amount of hints, even if the client plans to query only once or a few times. In this paper, we are the first to propose a hint-based PIR with commodity servers, which we call CHOO-PIR. The purpose of the commodity servers is to manage the hints for the client. In order to preserve the privacy of the client against the commodity servers, we apply fully homomorphic encryption (FHE) or secret sharing (SS) schemes. Our FHE-based scheme achieves both client computational cost of $\widetilde{O}(1)$ and database server online computational cost of $\widetilde{O}(\sqrt{n})$, where n is the database size. While the FHE-based scheme requires public-key cryptography, we can avoid such operations in the SS-based scheme, with a trade-off of client computational cost and online communication cost. Kittiphop Phalakarn, Ryuya Hayashi |
PST | 2 |
| 2024 | On the Implications from Updatable Encryption to Public-Key Cryptographic Primitives
Yuichi Tanishita, Ryuya Hayashi, Ryu Ishii, Takahiro Matsuda 0002, Kanta Matsuura |
ACISP (1) | 2 |
| 2024 | Multi-query Verifiable PIR and Its Application
Ryuya Hayashi, Junichiro Hayata, Keisuke Hara, Kenta Nomura, Masaki Kamizono, Goichiro Hanaoka |
CANS (2) | 1 |
| 2024 | Updatable Encryption Secure Against Randomness Compromise
Yuichi Tanishita, Ryuya Hayashi, Ryu Ishii, Takahiro Matsuda 0002, Kanta Matsuura |
CANS (2) | 2 |
| 2024 | Anonymous Reputation Systems with Revocation, Revisited
Ryuya Hayashi, Shuichi Katsumata, Yusuke Sakai 0001 |
FC (2) | 1 |
| 2023 | Signature for Objects: Formalizing How to Authenticate Physical Data and More
Ryuya Hayashi, Taiki Asano, Junichiro Hayata, Takahiro Matsuda 0002, Shota Yamada 0001, Shuichi Katsumata, Yusuke Sakai 0001, Tadanori Teruya, Jacob C. N. Schuldt, Nuttapong Attrapadung, Goichiro Hanaoka, Kanta Matsuura, Tsutomu Matsumoto |
FC (1) | 1 |