Safety of templates in biometric person authentication using error-correcting code. - Tetsushi Ohki; Shiro Akatsuka; Naohisa Komatsu; Masao Kasahara (Security, Steganography, and Watermarking of Multimedia Contents, 2006)

On biometric encryption using fingerprint and it's security evaluation. - Seira Hidano; Tetsushi Ohki; Naohisa Komatsu; Masao Kasahara (ICARCV, 2008)

A metric of identification performance of biometrics based on information content. - Seira Hidano; Tetsushi Ohki; Naohisa Komatsu; Kenta Takahashi (ICARCV, 2010)

Evaluation of security for biometric guessing attacks in biometric cryptosystem using fuzzy commitment scheme. - Seira Hidano; Tetsushi Ohki; Kenta Takahashi (BIOSIG, 2012)

Evaluation of wolf attack for classified target on speaker verification systems. - Tetsushi Ohki; Seira Hidano; Tatsuya Takehisa (ICARCV, 2012)

New Security Definitions for Biometric Authentication with Template Protection: Toward covering more threats against authentication systems. - Toshiyuki Isshiki; Toshinori Araki; Kengo Mori; Satoshi Obana; Tetsushi Ohki; Shizuo Sakamoto (BIOSIG, 2013)

Security performance evaluation for biometric template protection techniques. - Yoshiaki Isobe; Tetsushi Ohki; Naohisa Komatsu (Int. J. Biom., 2013)

A consideration on a common template-based biometric cryptosystem using on-line signatures. - Yuuki Goubaru; Yasushi Yamazaki; Takeru Miyazaki; Tetsushi Ohki (GCCE, 2014)

Theoretical vulnerability in likelihood-ratio-based biometric verification. - Tetsushi Ohki; Akira Otsuka (IJCB, 2014)

Optimal sequential fusion for multibiometric cryptosystems. - Takao Murakami; Tetsushi Ohki; Kenta Takahashi (Inf. Fusion, 2016)

A Study on Autoencoder-based Reconstruction Method for Wi-Fi Location Data with Erasures. - Tetsushi Ohki; Akira Otsuka (MPS@CCS, 2017)

Theoretical vulnerabilities in map speaker adaptation. - Tetsushi Ohki; Akira Otsuka (ICASSP, 2017)

A Secure and Practical Signature Scheme for Blockchain Based on Biometrics. - Yosuke Kaga; Masakazu Fujio; Ken Naganuma; Kenta Takahashi; Takao Murakami; Tetsushi Ohki; Masakatsu Nishigaki (ISPEC, 2017)

Toward More Secure and Convenient User Authentication in Smart Device Era. - Yasushi Yamazaki; Tetsushi Ohki (IEICE Trans. Inf. Syst., 2017)

Ransomware Detection Considering User's Document Editing. - Toshiki Honda; Kohei Mukaiyama; Takeharu Shirai; Tetsushi Ohki; Masakatsu Nishigaki (AINA, 2018)

Biometric Bit String Generation for Smart-Phones Using Voice Data. - Aki Harada; Yasushi Yamazaki; Tetsushi Ohki (APSIPA, 2018)

Face/Fingerphoto Spoof Detection under Noisy Conditions by using Deep Convolutional Neural Network. - Masakazu Fujio; Yosuke Kaga; Takao Murakami; Tetsushi Ohki; Kenta Takahashi (BIOSIGNALS, 2018)

Automatic Examination-Based Whitelist Generation for XSS Attack Detection. - Keisuke Inoue; Toshiki Honda; Kohei Mukaiyama; Tetsushi Ohki; Masakatsu Nishigaki (BWCCA, 2018)

Micro Disposable Biometric Authentication: An Application Using Fingernail Minute Textures for Nonsensitive Services. - Genki Sugimoto; Masahiro Fujita; Yuto Mano; Tetsushi Ohki; Masakatsu Nishigaki (ICBSP, 2018)

A Study on Human Reflex-Based Biometric Authentication Using Eye-Head Coordination. - Yosuke Takahashi; Masashi Endo; Hiroaki Matsuno; Hiroaki Muramatsu; Tetsushi Ohki; Masakatsu Nishigaki (NBiS, 2018)

Efficient Spoofing Attack Detection against Unknown Sample using End-to-End Anomaly Detection. - Tetsushi Ohki; Vishu Gupta; Masakatsu Nishigaki (APSIPA, 2019)

PDH : Probabilistic Deep Hashing Based on Map Estimation of Hamming Distance. - Yosuke Kaga; Masakazu Fujio; Kenta Takahashi; Tetsushi Ohki; Masakatsu Nishigaki (ICIP, 2019)

DiReCT: Disaster Response Coordination with Trusted Volunteers. - Mohammad Jahanian; Toru Hasegawa; Yoshinobu Kawabe; Yuki Koizumi; Amr Magdy 001; Masakatsu Nishigaki; Tetsushi Ohki; K. K. Ramakrishnan (ICT-DM, 2019)

On Trust Confusional, Trust Ignorant, and Trust Transitions. - Yoshinobu Kawabe; Yuki Koizumi; Tetsushi Ohki; Masakatsu Nishigaki; Toru Hasegawa; Tetsuhisa Oda (IFIPTM, 2019)

Cancelable Permutation-Based Indexing for Secure and Efficient Biometric Identification. - Takao Murakami; Ryo Fujita; Tetsushi Ohki; Yosuke Kaga; Masakazu Fujio; Kenta Takahashi (IEEE Access, 2019)

Cancelable indexing based on low-rank approximation of correlation-invariant random filtering for fast and secure biometric identification. - Takao Murakami; Tetsushi Ohki; Yosuke Kaga; Masakazu Fujio; Kenta Takahashi (Pattern Recognit. Lett., 2019)

Micro Biometric Authentication Using Fingernail Surfaces: A Study of Practical Use. - Yuya Shiomi; Genki Sugimoto; Ayaka Sugimoto; Kota Uehara; Masahiro Fujita; Yuto Mano; Tetsushi Ohki; Masakatsu Nishigaki (AINA, 2020)

Study on Possibility of Estimating Smartphone Inputs from Tap Sounds. - Yumo Ouchi; Ryosuke Okudera; Yuya Shiomi; Kota Uehara; Ayaka Sugimoto; Tetsushi Ohki; Masakatsu Nishigaki (APSIPA, 2020)

Understanding the Impact of Service Trials on Privacy Disclosure. - Yayoi Suganuma; Jun Narita; Masakatsu Nishigaki; Tetsushi Ohki (HCI (40), 2020)

Communication Protocol Between Humans and Bank Server Secure Against Man-in-the-Browser Attacks. - Koki Mukaihira; Yasuyoshi Jinno; Takashi Tsuchiya; Tetsushi Ohki; Kenta Takahashi; Wakaha Ogata; Masakatsu Nishigaki (IHSI, 2020)

A Liveness Detection Method for Palmprint Authentication. - Ayaka Sugimoto; Yuya Shiomi; Akira Baba; Norihiro Okui; Tetsushi Ohki; Yutaka Miyake; Masakatsu Nishigaki (IHSI, 2020)

Examining of Shallow Autoencoder on Black-box Attack against Face Recognition. - Vo Ngoc Khoi Nguyen; Takamichi Terada; Masakatsu Nishigaki; Tetsushi Ohki (APSIPA ASC, 2021)

Improved Post-quantum-secure Face Template Protection System Based on Packed Homomorphic Encryption. - Hiroto Tamiya; Toshiyuki Isshiki; Kengo Mori; Satoshi Obana; Tetsushi Ohki (BIOSIG, 2021)

Synthesizing Privacy-Preserving Location Traces Including Co-locations. - Jun Narita; Yayoi Suganuma; Masakatsu Nishigaki; Takao Murakami; Tetsushi Ohki (DPM/CBT@ESORICS, 2021)

Deterrence-Based Trust: A Study on Improving the Credibility of Social Media Messages in Disaster Using Registered Volunteers. - Takumi Kitagawa; Tetsushi Ohki; Yuki Koizumi; Yoshinobu Kawabe; Toru Hasegawa; Masakatsu Nishigaki (NBiS, 2021)

Improving Robustness and Visibility of Adversarial CAPTCHA Using Low-Frequency Perturbation. - Takamichi Terada; Vo Ngoc Khoi Nguyen; Masakatsu Nishigaki; Tetsushi Ohki (AINA (2), 2022)

Model-Free Template Reconstruction Attack with Feature Converter. - Muku Akasaka; Soshi Maeda; Yuya Sato; Masakatsu Nishigaki; Tetsushi Ohki (BIOSIG, 2022)

Improving Palmprint-Region Estimation for ID-Less Palmprint Recognition. - Ayumi Serizawa; Ryosuke Okudera; Yumo Ouchi; Mizuho Yoshihira; Yuya Shiomi; Naoya Nitta; Masataka Nakahara; Akira Baba; Yutaka Miyake; Tetsushi Ohki; Masakatsu Nishigaki (BWCCA, 2022)

Improving Classification Accuracy by Optimizing Activation Function for Convolutional Neural Network on Homomorphic Encryption. - Kohei Yagyu; Ren Takeuchi; Masakatsu Nishigaki; Tetsushi Ohki (BWCCA, 2022)

Privacy-aware Snippets: Enhancing Assessment of Balance between Privacy Risks and Benefits in Web Search. - Yusuke Shimizu; Tetsushi Ohki; Yusuke Yamamoto (GoodIT, 2022)

Improving Rank-N Identification Rate of Palmprint Identification Using Permutation-Based Indexing. - Mizuho Yoshihira; Ayumi Serizawa; Ryosuke Okudera; Yumo Ouchi; Yuya Shiomi; Naoya Nitta; Masataka Nakahara; Akira Baba; Yutaka Miyake; Tetsushi Ohki; Masakatsu Nishigaki (HCI (32), 2022)

Multi-observed Multi-factor Authentication: A Multi-factor Authentication Using Single Credential. - Shinnosuke Nozaki; Ayumi Serizawa; Mizuho Yoshihira; Masahiro Fujita; Yoichi Shibata; Tadakazu Yamanaka; Nori Matsuda; Tetsushi Ohki; Masakatsu Nishigaki (NBiS, 2022)

Development of a Robust Ear Recognition Algorithm using Planar Approximation. - Takahiko Arakawa; Yuya Sato; Hitoshi Sakano; Tetsushi Ohki (APSIPA ASC, 2023)

Scheme for Selection of Deceptions as a Countermeasure for Insider Threats. - Sana Okumura; Tomoya Amagasa; Tsubasa Shibata; Takumi Yamamoto; Tadakazu Yamanaka; Tetsushi Ohki; Masakatsu Nishigaki (BWCCA, 2023)

PinchKey: A Natural and User-Friendly Approach to VR User Authentication. - Mei Suzuki; Ryo Iijima; Kazuki Nomoto; Tetsushi Ohki; Tatsuya Mori (EuroUSEC, 2023)

The Unconstrained Ear Recognition Challenge 2023: Maximizing Performance and Minimizing Bias. - 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; et al. (IJCB, 2023)

Multibiometrics Using a Single Face Image. - Koichi Ito 001; Taito Tonosaki; Takafumi Aoki; Tetsushi Ohki; Masakatsu Nishigaki (APSIPA, 2024)

Multi-Observed Authentication: A secure and usable authentication based on multi-point observation of a single physical credential. - Wataru Hatakeyama; Shinnosuke Nozaki; Ayumi Serizawa; Mizuho Yoshihira; Masahiro Fujita; Ayako Yoshimura; Tetsushi Ohki; Masakatsu Nishigaki (APSIPA, 2024)

Enhancing Remote Adversarial Patch Attacks on Face Detectors with Tiling and Scaling. - Masora Okano; Koichi Ito 001; Masakatsu Nishigaki; Tetsushi Ohki (APSIPA, 2024)

The Catcher in the Eye: Recognizing Users by their Blinks. - Ryo Iijima; Tatsuya Takehisa; Tetsushi Ohki; Tatsuya Mori (AsiaCCS, 2024)

Perceiving Human Psychological Consistency: Attack Detection Against Advanced Persistent Social Engineering. - Kota Numada; Shinnosuke Nozaki; Takumi Takaiwa; Tetsushi Ohki; Masakatsu Nishigaki (EIDWT, 2024)

Are Dark Patterns Self-destructive for Service Providers?: Revealing Their Impacts on Usability and User Satisfaction. - Toi Kojima; Tomoya Aiba; Soshi Maeda; Hiromi Arai; Masakatsu Nishigaki; Tetsushi Ohki (HCI (37), 2024)

Electrical Muscle Stimulation System for Automatic Reproduction of Secret Information Without Exposing Biometric Data. - Takumi Takaiwa; Shinnosuke Nozaki; Kota Numada; Tsubasa Shibata; Sana Okumura; Soichi Takigawa; Tetsushi Ohki; Masakatsu Nishigaki (HCI (46), 2024)

A Human-Centered Risk Evaluation of Biometric Systems Using Conjoint Analysis. - Tetsushi Ohki; Narishige Abe; Hidetsugu Uchida; Shigefumi Yamada (IJCB, 2024)

LabellessFace: Fair Metric Learning for Face Recognition without Attribute Labels. - Tetsushi Ohki; Yuya Sato; Masakatsu Nishigaki; Koichi Ito 001 (IJCB, 2024)

MagSerea: Fingerprinting Magnetic Field of Specified Area with Wearable Sensors. - Tomoya Aiba; Takahiko Arakawa; Masakatsu Nishigaki; Tatsuya Mori; Tetsushi Ohki (MobileHCI (Companion), 2024)

DAP PLXENT#x1D107; : Develop pair-Authentication Protocol with DAP. - Soshi Maeda; Masora Okano; Masakatsu Nishigaki; Tetsushi Ohki (MobileHCI (Companion), 2024)

ExpressionAuth: Utilizing Avatar Expression Blendshapes for Behavioral Biometrics in VR. - Tussoun Jitpanyoyos; Yuya Sato; Soshi Maeda; Masakatsu Nishigaki; Tetsushi Ohki (VR Workshops, 2024)

Ensemble Malware Classifier Considering PE Section Information. - Ren Takeuchi; Rikima Mitsuhashi; Masakatsu Nishigaki; Tetsushi Ohki (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2024)

Synthesizing differentially private location traces including co-locations. - Jun Narita; Takao Murakami; Hideitsu Hino; Masakatsu Nishigaki; Tetsushi Ohki (Int. J. Inf. Sec., 2024)

Leveraging Intermediate Features of Vision Transformer for Face Anti-Spoofing. - Mika Feng; Koichi Ito 001; Takafumi Aoki; Tetsushi Ohki; Masakatsu Nishigaki (CVPR Workshops, 2025)

Study of Appropriate Information Combination in Image-based Obfuscated Malware Detection. - Tetsuro Takahashi; Rikima Mitsuhashi; Masakatsu Nishigaki; Tetsushi Ohki (DSN-S, 2025)

CAPT-AI: Study on AI Model Identification Using Ability Differences. - Seiya Kajihara; Takumi Takaiwa; Tsubasa Shibata; Nami Ashizawa; Naoto Kiribuchi; Toshiki Shibahara; Osamu Saisho; Tetsushi Ohki; Masakatsu Nishigaki (HCI (63), 2025)

Measuring Intrinsic Dimension of Token Embeddings. - Takuya Kataiwa; Cho Hakaze; Tetsushi Ohki (CoRR, 2025)

Can We End the Cat-and-Mouse Game? Simulating Self-Evolving Phishing Attacks with LLMs and Genetic Algorithms. - Seiji Sato; Tetsushi Ohki; Masakatsu Nishigaki (CoRR, 2025)