Yoshihiro Koseki

dblp:171/1748 · DBLP profile ↗
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9ranked-venue papers
0as first author
3since 2021 · last 2025
—ORCID · none

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Security and privacy · 9 · 3 since 2021
YearPublicationVenuePosition
2025 Abuse-Resistant Evaluation of AI-as-a-Service via Function-Hiding Homomorphic Signatures
Nuttapong Attrapadung, Goichiro Hanaoaka, Ryo Hiromasa, Yoshihiro Koseki, Takahiro Matsuda 0002, Yutaro Nishida, Yusuke Sakai 0001, Jacob C. N. Schuldt, Satoshi Yasuda
ESORICS (1)4
2024 Privacy-Preserving Verifiable CNNs
abstract
Convolutional neural networks (CNNs) have emerged as one of the most successful deep learning approaches to image recognition and classification. A recent line of research, which includes zkCNN (ACM CCS ’21), vCNN (Cryptology ePrint Archive), and ZEN (Cryptology ePrint Archive), aims at protecting the privacy of CNN models by developing publicly verifiable proofs of correct classification which do not leak any information about the underlying CNN models themselves. A shared feature of these schemes is that they require the entity constructing the proof to have access to both the model and the input in the clear. In other words, a client holding a potentially sensitive input is required to reveal this input to the entity holding the CNN model, thereby sacrificing his privacy, to be able to obtain a verifiable proof of correct classification. This is in contrast to the security guarantees provided by secure classification considered in privacy-preserving machine learning, which does not require the client to reveal his input to obtain a (non-verifiable) classification. In this paper, we propose a privacy-preserving verifiable CNN scheme that overcomes this limitation of the previous schemes by allowing the client to obtain a classification proof without having to reveal his input. The obtained proof allows the client to selectively reveal properties of the obtained classification and his input, which will be verifiable to any third-party verifier. Our scheme is based on the recent notion of collaborative zk-SNARKs by Ozdemir and Boneh (USENIX ’22). Specifically, we construct a new collaborative zk-SNARK based on Bulletproofs achieving an efficient maliciously secure proof generation protocol. Based on this, we then present an optimized approach to CNN evaluation. Finally, we demonstrate the feasibility of our approach by measuring the performance of our scheme on a CNN for classifying the MNIST dataset.
Nuttapong Attrapadung, Goichiro Hanaoka, Ryo Hiromasa, Yoshihiro Koseki, Takahiro Matsuda 0002, Yutaro Nishida, Yusuke Sakai 0001, Jacob C. N. Schuldt, Satoshi Yasuda
ACNS (2)4
2024 Multi-user Dynamic Searchable Encryption for Prefix-Fixing Predicates from Symmetric-Key Primitives
Takato Hirano, Yutaka Kawai, Yoshihiro Koseki, Satoshi Yasuda, Yohei Watanabe 0001, Takumi Amada, Mitsugu Iwamoto, Kazuo Ohta
SAC (1)3
2018 Efficient Trapdoor Generation from Multiple Hashing in Searchable Symmetric Encryption
Takato Hirano, Yutaka Kawai, Yoshihiro Koseki
ISPEC3
2018 Multi-key Homomorphic Proxy Re-Encryption
Satoshi Yasuda, Yoshihiro Koseki, Ryo Hiromasa, Yutaka Kawai
ISC2
2018 Token-Based Multi-input Functional Encryption
Nuttapong Attrapadung, Goichiro Hanaoka, Takato Hirano, Yutaka Kawai, Yoshihiro Koseki, Jacob C. N. Schuldt
ProvSec5
2018 Formal Treatment of Verifiable Privacy-Preserving Data-Aggregation Protocols
Satoshi Yasuda, Yoshihiro Koseki, Yusuke Sakai 0001, Fuyuki Kitagawa, Yutaka Kawai, Goichiro Hanaoka
ProvSec2
2016 Probabilistic Generation of Trapdoors: Reducing Information Leakage of Searchable Symmetric Encryption
Kenichiro Hayasaka, Yutaka Kawai, Yoshihiro Koseki, Takato Hirano, Kazuo Ohta, Mitsugu Iwamoto
CANS3
2015 SEPM: Efficient Partial Keyword Search on Encrypted Data
Yutaka Kawai, Takato Hirano, Yoshihiro Koseki, Tatsuji Munaka
CANS3