Refined computational complexities of Hospitals/Residents problem with regional caps. - Hamada, Koki; Miyazaki, Shuichi (Theor. Comput. Sci., 2024)

Secure Statistical Analysis on Multiple Datasets: Join and Group-By. - Asharov, Gilad; Hamada, Koki; Ikarashi, Dai; Kikuchi, Ryo; Nof, Ariel; Pinkas, Benny; Tomida, Junichi (IACR Cryptol. ePrint Arch., 2024)

Fast Large-Scale Honest-Majority MPC for Malicious Adversaries. - Chida, Koji; Hamada, Koki; Ikarashi, Dai; Kikuchi, Ryo; Genkin, Daniel; Lindell, Yehuda; Nof, Ariel (J. Cryptol., 2023)

Designing a Location Trace Anonymization Contest. - Murakami, Takao; Arai, Hiromi; Hamada, Koki; Hatano, Takuma; Iguchi, Makoto; Kikuchi, Hiroaki; Kuromasa, Atsushi; Nakagawa, Hiroshi; Nakamura, Yuichi; Nishiyama, Kenshiro; Nojima, Ryo; Oguri, Hidenobu; et al. (Proc. Priv. Enhancing Technol., 2023)

Efficient decision tree training with new data structure for secure multi-party computation. - Hamada, Koki; Ikarashi, Dai; Kikuchi, Ryo; Chida, Koji (Proc. Priv. Enhancing Technol., 2023)

Communication-Efficient Inner Product Private Join and Compute with Cardinality. - Chida, Koji; Hamada, Koki; Ichikawa, Atsunori; Kii, Masanobu; Tomida, Junichi (2023)

Secure Statistical Analysis on Multiple Datasets: Join and Group-By. - Asharov, Gilad; Hamada, Koki; Kikuchi, Ryo; Nof, Ariel; Pinkas, Benny; Tomida, Junichi (2023)

3-Party Secure Computation for RAMs: Optimal and Concretely Efficient. - Ichikawa, Atsunori; Komargodski, Ilan; Hamada, Koki; Kikuchi, Ryo; Ikarashi, Dai (2023)

3-Party Secure Computation for RAMs: Optimal and Concretely Efficient. - Ichikawa, Atsunori; Komargodski, Ilan; Hamada, Koki; Kikuchi, Ryo; Ikarashi, Dai (IACR Cryptol. ePrint Arch., 2023)

Adam in Private: Secure and Fast Training of Deep Neural Networks with Adaptive Moment Estimation. - Attrapadung, Nuttapong; Hamada, Koki; Ikarashi, Dai; Kikuchi, Ryo; Matsuda, Takahiro; Mishina, Ibuki; Morita, Hiraku; Schuldt, Jacob C. N. (Proc. Priv. Enhancing Technol., 2022)

Efficient Secure Three-Party Sorting with Applications to Data Analysis and Heavy Hitters. - Asharov, Gilad; Hamada, Koki; Ikarashi, Dai; Kikuchi, Ryo; Nof, Ariel; Pinkas, Benny; Takahashi, Katsumi; Tomida, Junichi (2022)

Refined Computational Complexities of Hospitals/Residents Problem with Regional Caps. - Hamada, Koki; Miyazaki, Shuichi (2022)

Private Intersection-Weighted-Sum. - Chida, Koji; Hamada, Koki; Ichikawa, Atsunori; Kii, Masanobu; Tomida, Junichi (IACR Cryptol. ePrint Arch., 2022)

Efficient Secure Three-Party Sorting with Applications to Data Analysis and Heavy Hitters. - Asharov, Gilad; Hamada, Koki; Ikarashi, Dai; Kikuchi, Ryo; Nof, Ariel; Pinkas, Benny; Takahashi, Katsumi; Tomida, Junichi (IACR Cryptol. ePrint Arch., 2022)

Strongly Stable and Maximum Weakly Stable Noncrossing Matchings. - Hamada, Koki; Miyazaki, Shuichi; Okamoto, Kazuya (Algorithmica, 2021)

Privacy-Preserving Multiple Tensor Factorization for Synthesizing Large-Scale Location Traces with Cluster-Specific Features. - Murakami, Takao; Hamada, Koki; Kawamoto, Yusuke; Hatano, Takuma (Proc. Priv. Enhancing Technol., 2021)

Adam in Private: Secure and Fast Training of Deep Neural Networks with Adaptive Moment Estimation. - Attrapadung, Nuttapong; Hamada, Koki; Ikarashi, Dai; Kikuchi, Ryo; Matsuda, Takahiro; Mishina, Ibuki; Morita, Hiraku; Schuldt, Jacob C. N. (CoRR, 2021)

Refined Computational Complexities of Hospitals/Residents Problem with Regional Caps. - Hamada, Koki; Miyazaki, Shuichi (CoRR, 2021)

Designing a Location Trace Anonymization Contest. - Murakami, Takao; Arai, Hiromi; Hamada, Koki; Hatano, Takuma; Iguchi, Makoto; Kikuchi, Hiroaki; Kuromasa, Atsushi; Nakagawa, Hiroshi; Nakamura, Yuichi; Nishiyama, Kenshiro; Nojima, Ryo; Oguri, Hidenobu; et al. (CoRR, 2021)

Efficient decision tree training with new data structure for secure multi-party computation. - Hamada, Koki; Ikarashi, Dai; Kikuchi, Ryo; Chida, Koji (CoRR, 2021)

Adam in Private: Secure and Fast Training of Deep Neural Networks with Adaptive Moment Estimation. - Attrapadung, Nuttapong; Hamada, Koki; Ikarashi, Dai; Kikuchi, Ryo; Matsuda, Takahiro; Mishina, Ibuki; Morita, Hiraku; Schuldt, Jacob C. N. (IACR Cryptol. ePrint Arch., 2021)

Strongly Stable and Maximum Weakly Stable Noncrossing Matchings. - Hamada, Koki; Miyazaki, Shuichi; Okamoto, Kazuya (2020)

Strongly Stable and Maximum Weakly Stable Noncrossing Matchings. - Hamada, Koki; Miyazaki, Shuichi; Okamoto, Kazuya (CoRR, 2020)

Field Extension in Secret-Shared Form and Its Applications to Efficient Secure Computation. - Kikuchi, Ryo; Attrapadung, Nuttapong; Hamada, Koki; Ikarashi, Dai; Ishida, Ai; Matsuda, Takahiro; Sakai, Yusuke; Schuldt, Jacob C. N. (2019)

Efficient Secure Multi-Party Protocols for Decision Tree Classification. - Ichikawa, Atsunori; Ogata, Wakaha; Hamada, Koki; Kikuchi, Ryo (2019)

Strategy-Proof Approximation Algorithms for the Stable Marriage Problem with Ties and Incomplete Lists. - Hamada, Koki; Miyazaki, Shuichi; Yanagisawa, Hiroki (2019)

Strategy-Proof Approximation Algorithms for the Stable Marriage Problem with Ties and Incomplete Lists. - Hamada, Koki; Miyazaki, Shuichi; Yanagisawa, Hiroki (CoRR, 2019)

Privacy-Preserving Multiple Tensor Factorization for Synthesizing Large-Scale Location Traces. - Murakami, Takao; Hamada, Koki; Kawamoto, Yusuke; Hatano, Takuma (CoRR, 2019)

Field Extension in Secret-Shared Form and Its Applications to Efficient Secure Computation. - Kikuchi, Ryo; Attrapadung, Nuttapong; Hamada, Koki; Ikarashi, Dai; Ishida, Ai; Matsuda, Takahiro; Sakai, Yusuke; Schuldt, Jacob C. N. (IACR Cryptol. ePrint Arch., 2019)

An Efficient Secure Three-Party Sorting Protocol with an Honest Majority. - Chida, Koji; Hamada, Koki; Ikarashi, Dai; Kikuchi, Ryo; Kiribuchi, Naoto; Pinkas, Benny (IACR Cryptol. ePrint Arch., 2019)

Study on Record Linkage of Anonymizied Data. - Kikuchi, Hiroaki; Yamaguchi, Takayasu; Hamada, Koki; Yamaoka, Yuji; Oguri, Hidenobu; Sakuma, Jun (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2018)

Password-Based Authentication Protocol for Secret-Sharing-Based Multiparty Computation. - Kikuchi, Ryo; Chida, Koji; Ikarashi, Dai; Hamada, Koki (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2018)

How to Handle Excessively Anonymized Datasets. - Nojima, Ryo; Oguri, Hidenobu; Kikuchi, Hiroaki; Nakagawa, Hiroshi; Hamada, Koki; Murakami, Takao; Yamaoka, Yuji; Watanabe, Chiemi (J. Inf. Process., 2018)

Efficient Bit-Decomposition and Modulus-Conversion Protocols with an Honest Majority. - Kikuchi, Ryo; Ikarashi, Dai; Matsuda, Takahiro; Hamada, Koki; Chida, Koji (2018)

High-Throughput Secure AES Computation. - Chida, Koji; Hamada, Koki; Ikarashi, Dai; Kikuchi, Ryo; Pinkas, Benny (2018)

Fast Large-Scale Honest-Majority MPC for Malicious Adversaries. - Chida, Koji; Genkin, Daniel; Hamada, Koki; Ikarashi, Dai; Kikuchi, Ryo; Lindell, Yehuda; Nof, Ariel (2018)

Efficient Bit-Decomposition and Modulus-Conversion Protocols with an Honest Majority. - Kikuchi, Ryo; Ikarashi, Dai; Matsuda, Takahiro; Hamada, Koki; Chida, Koji (IACR Cryptol. ePrint Arch., 2018)

Fast Large-Scale Honest-Majority MPC for Malicious Adversaries. - Chida, Koji; Genkin, Daniel; Hamada, Koki; Ikarashi, Dai; Kikuchi, Ryo; Lindell, Yehuda; Nof, Ariel (IACR Cryptol. ePrint Arch., 2018)

Computational SS and conversion protocols in both active and passive settings. - Kikuchi, Ryo; Ikarashi, Dai; Chida, Koji; Hamada, Koki; Ogata, Wakaha (IET Inf. Secur., 2017)

The Hospitals/Residents Problem with Lower Quotas. - Hamada, Koki; Iwama, Kazuo; Miyazaki, Shuichi (Algorithmica, 2016)

Efficient Virtual Network Optimization Across Multiple Domains Without Revealing Private Information. - Mano, Toru; Inoue, Takeru; Ikarashi, Dai; Hamada, Koki; Mizutani, Kimihiro; Akashi, Osamu (IEEE Trans. Netw. Serv. Manag., 2016)

Ice and Fire: Quantifying the Risk of Re-identification and Utility in Data Anonymization. - Kikuchi, Hiroaki; Yamaguchi, Takayasu; Hamada, Koki; Yamaoka, Yuji; Oguri, Hidenobu; Sakuma, Jun (2016)

A Study from the Data Anonymization Competition Pwscup 2015. - Kikuchi, Hiroaki; Yamaguchi, Takayasu; Hamada, Koki; Yamaoka, Yuji; Oguri, Hidenobu; Sakuma, Jun (2016)

Evaluation of Secure Computation in a Distributed Healthcare Setting. - Kimura, Eizen; Hamada, Koki; Kikuchi, Ryo; Chida, Koji; Okamoto, Kazuya; Manabe, Shirou; Kuroda, Tomohiro; Matsumura, Yasushi; Takeda, Toshihiro; Mihara, Naoki (2016)

Secret Sharing with Share-Conversion: Achieving Small Share-Size and Extendibility to Multiparty Computation. - Kikuchi, Ryo; Chida, Koji; Ikarashi, Dai; Ogata, Wakaha; Hamada, Koki; Takahashi, Katsumi (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2015)

Adaptively and Unconditionally Secure Conversion Protocols between Ramp and Linear Secret Sharing. - Kikuchi, Ryo; Ikarashi, Dai; Hamada, Koki; Chida, Koji (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2015)

Practical Password-Based Authentication Protocol for Secret Sharing Based Multiparty Computation. - Kikuchi, Ryo; Chida, Koji; Ikarashi, Dai; Hamada, Koki (2015)

Efficient virtual network optimization across multiple domains without revealing private information. - Mano, Toru; Inoue, Takeru; Ikarashi, Dai; Hamada, Koki; Mizutani, Kimihiro; Akashi, Osamu (2014)

Oblivious Radix Sort: An Efficient Sorting Algorithm for Practical Secure Multi-party Computation. - Hamada, Koki; Ikarashi, Dai; Chida, Koji; Takahashi, Katsumi (IACR Cryptol. ePrint Arch., 2014)

Actively Private and Correct MPC Scheme in t<n/2 from Passively Secure Schemes with Small Overhead. - Ikarashi, Dai; Kikuchi, Ryo; Hamada, Koki; Chida, Koji (IACR Cryptol. ePrint Arch., 2014)

A Picturesque Maze Generation Algorithm with Any Given Endpoints. - Hamada, Koki (Inf. Media Technol., 2013)

A Picturesque Maze Generation Algorithm with Any Given Endpoints. - Hamada, Koki (J. Inf. Process., 2013)

Secret Sharing Schemes with Conversion Protocol to Achieve Short Share-Size and Extendibility to Multiparty Computation. - Kikuchi, Ryo; Chida, Koji; Ikarashi, Dai; Hamada, Koki; Takahashi, Katsumi (2013)

Practically Efficient Multi-party Sorting Protocols from Comparison Sort Algorithms. - Hamada, Koki; Kikuchi, Ryo; Ikarashi, Dai; Chida, Koji; Takahashi, Katsumi (2012)

Applicability of existing anonymization methods to large location history data in urban travel. - Yamaguchi, Rie Shigetomi; Hirota, Keiichi; Hamada, Koki; Takahashi, Katsumi; Matsuzaki, Kazutaka; Sakuma, Jun; Shirai, Yasuyuki (2012)

The Hospitals/Residents Problem with Quota Lower Bounds. - Hamada, Koki; Iwama, Kazuo; Miyazaki, Shuichi (2011)

An improved approximation lower bound for finding almost stable maximum matchings. - Hamada, Koki; Iwama, Kazuo; Miyazaki, Shuichi (Inf. Process. Lett., 2009)

Usage of needle maps and shadows to overcome depth edges in depth map reconstruction. - Iiyama, Masaaki; Hamada, Koki; Kakusho, Koh; Minoh, Michihiko (2008)