Tetsushi Ohki

80 papers A 1B 7C 4Misc 1Journal 17Unranked 50
YearRankTypeTitle / Venue / Authors
2026 — conf
Invisible Consent: Browser Automation by LLM Agents is Not Privacy-aware.
CHI Extended Abstracts
Ryota Saito, Takuya Kataiwa, Minato Takashima, Tetsushi Ohki
2026 — conf
Secure and Usable Authentication Using Avatar Expression Blendshapes in Virtual Reality.
CHI Extended Abstracts
Natsuki Nagai, Tetsuro Takahashi, Takuya Kataiwa, Masakatsu Nishigaki, Tetsushi Ohki
2025 — conf
A Study on AI Model Identification Based on Ability Differences: An Initial Approach Using Semantic Understanding Ability.
BWCCA
Seiya Kajihara, Ryunosuke Harada, Toma Ogiri, Wataru Hatakeyama, Kazuki Takabayashi, Seiji Sato, Nami Ashizawa, Toshiki Shibahara, Osamu Saisho, Tetsushi Ohki, Masakatsu Nishigaki
2025 — conf
Advanced Persistent Social Engineering Using M-to-N Cybernetic Avatar Operation and Consideration of Countermeasures.
BWCCA
Toma Ogiri, Seiya Kajihara, Ryunosuke Harada, Kazuki Takabayashi, Wataru Hatakeyama, Seiji Sato, Tetsushi Ohki, Masakatsu Nishigaki
2025 — conf
Applicability Evaluation of Synthetic Images for Performance Testing via Quality and Similarity Assessment.
BIOSIG
Hajime Nada, Yoshimitsu Ogawa, Hidetsugu Uchida, Tetsushi Ohki, Shigefumi Yamada, Kazuhiko Sumi
2025 — conf
CAPT-AI: Study on AI Model Identification Using Ability Differences.
HCI (63)
Seiya Kajihara, Takumi Takaiwa, Tsubasa Shibata, Nami Ashizawa, Naoto Kiribuchi, Toshiki Shibahara, Osamu Saisho, Tetsushi Ohki, Masakatsu Nishigaki
2025 J jnl
Can We End the Cat-and-Mouse Game? Simulating Self-Evolving Phishing Attacks with LLMs and Genetic Algorithms.
CoRR
Seiji Sato, Tetsushi Ohki, Masakatsu Nishigaki
2025 — conf
Leveraging Intermediate Features of Vision Transformer for Face Anti-Spoofing.
CVPR Workshops
Mika Feng, Koichi Ito, Takafumi Aoki, Tetsushi Ohki, Masakatsu Nishigaki
2025 J jnl
Leveraging Intermediate Features of Vision Transformer for Face Anti-Spoofing.
CoRR
Mika Feng, Koichi Ito, Takafumi Aoki, Tetsushi Ohki, Masakatsu Nishigaki
2025 J jnl
Measuring Intrinsic Dimension of Token Embeddings.
CoRR
Takuya Kataiwa, Cho Hakaze, Tetsushi Ohki
2025 — conf
One Model, All Attacks: ACER-Optimized Vision Transformer for Robust Face Anti-Spoofing.
ICCVW
Jie Jin, Mahiro Tokumasu, Yu Makino, Shumpei Nishikawa, Tetsushi Ohki
2025 J jnl
PinchKey: A Highly Accurate and Usable Behavioral Biometric Authentication Method for VR Users.
J. Inf. Process.
Mei Suzuki, Ryo Iijima, Kazuki Nomoto, Tetsushi Ohki, Tatsuya Mori
2025 — conf
Social Engineering Attack Targeting Vulnerabilities in 1-to-N Avatar Operation Switching: A Positioning Study.
BWCCA
Itta Matsuda, Sena Enomoto, Tsubasa Shibata, Fan Yang, Seiji Sato, Tetsushi Ohki, Masakatsu Nishigaki
2025 — conf
Study of Appropriate Information Combination in Image-based Obfuscated Malware Detection.
DSN-S
Tetsuro Takahashi, Rikima Mitsuhashi, Masakatsu Nishigaki, Tetsushi Ohki
2024 B conf
A Human-Centered Risk Evaluation of Biometric Systems Using Conjoint Analysis.
IJCB
Tetsushi Ohki, Narishige Abe, Hidetsugu Uchida, Shigefumi Yamada
2024 J jnl
A Human-Centered Risk Evaluation of Biometric Systems Using Conjoint Analysis.
CoRR
Tetsushi Ohki, Narishige Abe, Hidetsugu Uchida, Shigefumi Yamada
2024 — conf
Are Dark Patterns Self-destructive for Service Providers?: Revealing Their Impacts on Usability and User Satisfaction.
HCI (37)
Toi Kojima, Tomoya Aiba, Soshi Maeda, Hiromi Arai, Masakatsu Nishigaki, Tetsushi Ohki
2024 — conf
DAP PLXENT#x1D107; : Develop pair-Authentication Protocol with DAP.
MobileHCI (Companion)
Soshi Maeda, Masora Okano, Masakatsu Nishigaki, Tetsushi Ohki
2024 — conf
Electrical Muscle Stimulation System for Automatic Reproduction of Secret Information Without Exposing Biometric Data.
HCI (46)
Takumi Takaiwa, Shinnosuke Nozaki, Kota Numada, Tsubasa Shibata, Sana Okumura, Soichi Takigawa, Tetsushi Ohki, Masakatsu Nishigaki
2024 — conf
Enhancing Remote Adversarial Patch Attacks on Face Detectors with Tiling and Scaling.
APSIPA
Masora Okano, Koichi Ito, Masakatsu Nishigaki, Tetsushi Ohki
2024 J jnl
Enhancing Remote Adversarial Patch Attacks on Face Detectors with Tiling and Scaling.
CoRR
Masora Okano, Koichi Ito, Masakatsu Nishigaki, Tetsushi Ohki
2024 J jnl
Ensemble Malware Classifier Considering PE Section Information.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Ren Takeuchi, Rikima Mitsuhashi, Masakatsu Nishigaki, Tetsushi Ohki
2024 — conf
ExpressionAuth: Utilizing Avatar Expression Blendshapes for Behavioral Biometrics in VR.
VR Workshops
Tussoun Jitpanyoyos, Yuya Sato, Soshi Maeda, Masakatsu Nishigaki, Tetsushi Ohki
2024 B conf
LabellessFace: Fair Metric Learning for Face Recognition without Attribute Labels.
IJCB
Tetsushi Ohki, Yuya Sato, Masakatsu Nishigaki, Koichi Ito
2024 J jnl
LabellessFace: Fair Metric Learning for Face Recognition without Attribute Labels.
CoRR
Tetsushi Ohki, Yuya Sato, Masakatsu Nishigaki, Koichi Ito
2024 — conf
MagSerea: Fingerprinting Magnetic Field of Specified Area with Wearable Sensors.
MobileHCI (Companion)
Tomoya Aiba, Takahiko Arakawa, Masakatsu Nishigaki, Tatsuya Mori, Tetsushi Ohki
2024 — conf
Multi-Observed Authentication: A secure and usable authentication based on multi-point observation of a single physical credential.
APSIPA
Wataru Hatakeyama, Shinnosuke Nozaki, Ayumi Serizawa, Mizuho Yoshihira, Masahiro Fujita, Ayako Yoshimura, Tetsushi Ohki, Masakatsu Nishigaki
2024 — conf
Multibiometrics Using a Single Face Image.
APSIPA
Koichi Ito, Taito Tonosaki, Takafumi Aoki, Tetsushi Ohki, Masakatsu Nishigaki
2024 J jnl
Multibiometrics Using a Single Face Image.
CoRR
Koichi Ito, Taito Tonosaki, Takafumi Aoki, Tetsushi Ohki, Masakatsu Nishigaki
2024 — conf
Perceiving Human Psychological Consistency: Attack Detection Against Advanced Persistent Social Engineering.
EIDWT
Kota Numada, Shinnosuke Nozaki, Takumi Takaiwa, Tetsushi Ohki, Masakatsu Nishigaki
2024 J jnl
Synthesizing differentially private location traces including co-locations.
Int. J. Inf. Sec.
Jun Narita, Takao Murakami, Hideitsu Hino, Masakatsu Nishigaki, Tetsushi Ohki
2024 A conf
The Catcher in the Eye: Recognizing Users by their Blinks.
AsiaCCS
Ryo Iijima, Tatsuya Takehisa, Tetsushi Ohki, Tatsuya Mori
2023 — conf
Development of a Robust Ear Recognition Algorithm using Planar Approximation.
APSIPA ASC
Takahiko Arakawa, Yuya Sato, Hitoshi Sakano, Tetsushi Ohki
2023 — conf
PinchKey: A Natural and User-Friendly Approach to VR User Authentication.
EuroUSEC
Mei Suzuki, Ryo Iijima, Kazuki Nomoto, Tetsushi Ohki, Tatsuya Mori
2023 — conf
Scheme for Selection of Deceptions as a Countermeasure for Insider Threats.
BWCCA
Sana Okumura, Tomoya Amagasa, Tsubasa Shibata, Takumi Yamamoto, Tadakazu Yamanaka, Tetsushi Ohki, Masakatsu Nishigaki
2023 B conf
The Unconstrained Ear Recognition Challenge 2023: Maximizing Performance and Minimizing Bias.
IJCB
Ziga Emersic, Tetsushi Ohki, Muku Akasaka, Takahiko Arakawa, Soshi Maeda, Masora Okano, Yuya Sato, Anjith George, Sébastien Marcel, Iyyakutti Iyappan Ganapathi, Syed Sadaf Ali, Sajid Javed, Naoufel Werghi, S. G. Isik, Erdi Saritas, Hazim Kemal Ekenel, V. Hudovernik, Jan Niklas Kolf, Fadi Boutros, Naser Damer, G. Sharma, Aman Kamboj, Aditya Nigam, Deepak Kumar Jain, G. Cámara-Chávez, Peter Peer, Vitomir Struc
2022 — conf
Improving Classification Accuracy by Optimizing Activation Function for Convolutional Neural Network on Homomorphic Encryption.
BWCCA
Kohei Yagyu, Ren Takeuchi, Masakatsu Nishigaki, Tetsushi Ohki
2022 — conf
Improving Palmprint-Region Estimation for ID-Less Palmprint Recognition.
BWCCA
Ayumi Serizawa, Ryosuke Okudera, Yumo Ouchi, Mizuho Yoshihira, Yuya Shiomi, Naoya Nitta, Masataka Nakahara, Akira Baba, Yutaka Miyake, Tetsushi Ohki, Masakatsu Nishigaki
2022 — conf
Improving Rank-N Identification Rate of Palmprint Identification Using Permutation-Based Indexing.
HCI (32)
Mizuho Yoshihira, Ayumi Serizawa, Ryosuke Okudera, Yumo Ouchi, Yuya Shiomi, Naoya Nitta, Masataka Nakahara, Akira Baba, Yutaka Miyake, Tetsushi Ohki, Masakatsu Nishigaki
2022 — conf
Improving Robustness and Visibility of Adversarial CAPTCHA Using Low-Frequency Perturbation.
AINA (2)
Takamichi Terada, Vo Ngoc Khoi Nguyen, Masakatsu Nishigaki, Tetsushi Ohki
2022 — conf
Model-Free Template Reconstruction Attack with Feature Converter.
BIOSIG
Muku Akasaka, Soshi Maeda, Yuya Sato, Masakatsu Nishigaki, Tetsushi Ohki
2022 — conf
Multi-observed Multi-factor Authentication: A Multi-factor Authentication Using Single Credential.
NBiS
Shinnosuke Nozaki, Ayumi Serizawa, Mizuho Yoshihira, Masahiro Fujita, Yoichi Shibata, Tadakazu Yamanaka, Nori Matsuda, Tetsushi Ohki, Masakatsu Nishigaki
2022 — conf
Privacy-aware Snippets: Enhancing Assessment of Balance between Privacy Risks and Benefits in Web Search.
GoodIT
Yusuke Shimizu, Tetsushi Ohki, Yusuke Yamamoto
2021 — conf
Deterrence-Based Trust: A Study on Improving the Credibility of Social Media Messages in Disaster Using Registered Volunteers.
NBiS
Takumi Kitagawa, Tetsushi Ohki, Yuki Koizumi, Yoshinobu Kawabe, Toru Hasegawa, Masakatsu Nishigaki
2021 — conf
Examining of Shallow Autoencoder on Black-box Attack against Face Recognition.
APSIPA ASC
Vo Ngoc Khoi Nguyen, Takamichi Terada, Masakatsu Nishigaki, Tetsushi Ohki
2021 — conf
Improved Post-quantum-secure Face Template Protection System Based on Packed Homomorphic Encryption.
BIOSIG
Hiroto Tamiya, Toshiyuki Isshiki, Kengo Mori, Satoshi Obana, Tetsushi Ohki
2021 — conf
Synthesizing Privacy-Preserving Location Traces Including Co-locations.
DPM/CBT@ESORICS
Jun Narita, Yayoi Suganuma, Masakatsu Nishigaki, Takao Murakami, Tetsushi Ohki
2020 — conf
A Liveness Detection Method for Palmprint Authentication.
IHSI
Ayaka Sugimoto, Yuya Shiomi, Akira Baba, Norihiro Okui, Tetsushi Ohki, Yutaka Miyake, Masakatsu Nishigaki
2020 — conf
Communication Protocol Between Humans and Bank Server Secure Against Man-in-the-Browser Attacks.
IHSI
Koki Mukaihira, Yasuyoshi Jinno, Takashi Tsuchiya, Tetsushi Ohki, Kenta Takahashi, Wakaha Ogata, Masakatsu Nishigaki
2020 B conf
Micro Biometric Authentication Using Fingernail Surfaces: A Study of Practical Use.
AINA
Yuya Shiomi, Genki Sugimoto, Ayaka Sugimoto, Kota Uehara, Masahiro Fujita, Yuto Mano, Tetsushi Ohki, Masakatsu Nishigaki
2020 — conf
Study on Possibility of Estimating Smartphone Inputs from Tap Sounds.
APSIPA
Yumo Ouchi, Ryosuke Okudera, Yuya Shiomi, Kota Uehara, Ayaka Sugimoto, Tetsushi Ohki, Masakatsu Nishigaki
2020 — conf
Understanding the Impact of Service Trials on Privacy Disclosure.
HCI (40)
Yayoi Suganuma, Jun Narita, Masakatsu Nishigaki, Tetsushi Ohki
2019 J jnl
Cancelable Permutation-Based Indexing for Secure and Efficient Biometric Identification.
IEEE Access
Takao Murakami, Ryo Fujita, Tetsushi Ohki, Yosuke Kaga, Masakazu Fujio, Kenta Takahashi
2019 J jnl
Cancelable indexing based on low-rank approximation of correlation-invariant random filtering for fast and secure biometric identification.
Pattern Recognit. Lett.
Takao Murakami, Tetsushi Ohki, Yosuke Kaga, Masakazu Fujio, Kenta Takahashi
2019 — conf
DiReCT: Disaster Response Coordination with Trusted Volunteers.
ICT-DM
Mohammad Jahanian, Toru Hasegawa, Yoshinobu Kawabe, Yuki Koizumi, Amr Magdy, Masakatsu Nishigaki, Tetsushi Ohki, K. K. Ramakrishnan
2019 — conf
Efficient Spoofing Attack Detection against Unknown Sample using End-to-End Anomaly Detection.
APSIPA
Tetsushi Ohki, Vishu Gupta, Masakatsu Nishigaki
2019 — conf
On Trust Confusional, Trust Ignorant, and Trust Transitions.
IFIPTM
Yoshinobu Kawabe, Yuki Koizumi, Tetsushi Ohki, Masakatsu Nishigaki, Toru Hasegawa, Tetsuhisa Oda
2019 B conf
PDH : Probabilistic Deep Hashing Based on Map Estimation of Hamming Distance.
ICIP
Yosuke Kaga, Masakazu Fujio, Kenta Takahashi, Tetsushi Ohki, Masakatsu Nishigaki
2019 J jnl
PDH : Probabilistic deep hashing based on MAP estimation of Hamming distance.
CoRR
Yosuke Kaga, Masakazu Fujio, Kenta Takahashi, Tetsushi Ohki, Masakatsu Nishigaki
2018 — conf
A Study on Human Reflex-Based Biometric Authentication Using Eye-Head Coordination.
NBiS
Yosuke Takahashi, Masashi Endo, Hiroaki Matsuno, Hiroaki Muramatsu, Tetsushi Ohki, Masakatsu Nishigaki
2018 — conf
Automatic Examination-Based Whitelist Generation for XSS Attack Detection.
BWCCA
Keisuke Inoue, Toshiki Honda, Kohei Mukaiyama, Tetsushi Ohki, Masakatsu Nishigaki
2018 — conf
Biometric Bit String Generation for Smart-Phones Using Voice Data.
APSIPA
Aki Harada, Yasushi Yamazaki, Tetsushi Ohki
2018 J jnl
Cancelable Indexing Based on Low-rank Approximation of Correlation-invariant Random Filtering for Fast and Secure Biometric Identification.
CoRR
Takao Murakami, Tetsushi Ohki, Yosuke Kaga, Masakazu Fujio, Kenta Takahashi
2018 — conf
Face/Fingerphoto Spoof Detection under Noisy Conditions by using Deep Convolutional Neural Network.
BIOSIGNALS
Masakazu Fujio, Yosuke Kaga, Takao Murakami, Tetsushi Ohki, Kenta Takahashi
2018 — conf
Micro Disposable Biometric Authentication: An Application Using Fingernail Minute Textures for Nonsensitive Services.
ICBSP
Genki Sugimoto, Masahiro Fujita, Yuto Mano, Tetsushi Ohki, Masakatsu Nishigaki
2018 B conf
Ransomware Detection Considering User's Document Editing.
AINA
Toshiki Honda, Kohei Mukaiyama, Takeharu Shirai, Tetsushi Ohki, Masakatsu Nishigaki
2017 C conf
A Secure and Practical Signature Scheme for Blockchain Based on Biometrics.
ISPEC
Yosuke Kaga, Masakazu Fujio, Ken Naganuma, Kenta Takahashi, Takao Murakami, Tetsushi Ohki, Masakatsu Nishigaki
2017 — conf
A Study on Autoencoder-based Reconstruction Method for Wi-Fi Location Data with Erasures.
MPS@CCS
Tetsushi Ohki, Akira Otsuka
2017 Misc conf
Theoretical vulnerabilities in map speaker adaptation.
ICASSP
Tetsushi Ohki, Akira Otsuka
2017 J jnl
Toward More Secure and Convenient User Authentication in Smart Device Era.
IEICE Trans. Inf. Syst.
Yasushi Yamazaki, Tetsushi Ohki
2016 J jnl
Optimal sequential fusion for multibiometric cryptosystems.
Inf. Fusion
Takao Murakami, Tetsushi Ohki, Kenta Takahashi
2014 — conf
A consideration on a common template-based biometric cryptosystem using on-line signatures.
GCCE
Yuuki Goubaru, Yasushi Yamazaki, Takeru Miyazaki, Tetsushi Ohki
2014 B conf
Theoretical vulnerability in likelihood-ratio-based biometric verification.
IJCB
Tetsushi Ohki, Akira Otsuka
2013 — conf
New Security Definitions for Biometric Authentication with Template Protection: Toward covering more threats against authentication systems.
BIOSIG
Toshiyuki Isshiki, Toshinori Araki, Kengo Mori, Satoshi Obana, Tetsushi Ohki, Shizuo Sakamoto
2013 J jnl
Security performance evaluation for biometric template protection techniques.
Int. J. Biom.
Yoshiaki Isobe, Tetsushi Ohki, Naohisa Komatsu
2012 — conf
Evaluation of security for biometric guessing attacks in biometric cryptosystem using fuzzy commitment scheme.
BIOSIG
Seira Hidano, Tetsushi Ohki, Kenta Takahashi
2012 C conf
Evaluation of wolf attack for classified target on speaker verification systems.
ICARCV
Tetsushi Ohki, Seira Hidano, Tatsuya Takehisa
2010 C conf
A metric of identification performance of biometrics based on information content.
ICARCV
Seira Hidano, Tetsushi Ohki, Naohisa Komatsu, Kenta Takahashi
2008 C conf
On biometric encryption using fingerprint and it's security evaluation.
ICARCV
Seira Hidano, Tetsushi Ohki, Naohisa Komatsu, Masao Kasahara
2006 — conf
Safety of templates in biometric person authentication using error-correcting code.
Security, Steganography, and Watermarking of Multimedia Contents
Tetsushi Ohki, Shiro Akatsuka, Naohisa Komatsu, Masao Kasahara