Koki Hamada

Publication Activity (10 Years)

Years Active: 2008-2024
Publications (10 Years): 44

Top Topics

Specific Features

Data Anonymization

Tensor Factorization

Top Venues

IACR Cryptol. ePrint Arch.

Proc. Priv. Enhancing Technol.

IEICE Trans. Fundam. Electron. Commun. Comput. Sci.

Publications

Koki Hamada, Shuichi Miyazaki
Refined computational complexities of Hospitals/Residents problem with regional caps. Theor. Comput. Sci. 989 (2024)
Gilad Asharov, Koki Hamada, Dai Ikarashi, Ryo Kikuchi, Ariel Nof, Benny Pinkas, Junichi Tomida
Secure Statistical Analysis on Multiple Datasets: Join and Group-By. IACR Cryptol. ePrint Arch. 2024 (2024)
Atsunori Ichikawa, Ilan Komargodski, Koki Hamada, Ryo Kikuchi, Dai Ikarashi
3-Party Secure Computation for RAMs: Optimal and Concretely Efficient. IACR Cryptol. ePrint Arch. 2023 (2023)
Koji Chida, Koki Hamada, Atsunori Ichikawa, Masanobu Kii, Junichi Tomida
Communication-Efficient Inner Product Private Join and Compute with Cardinality. AsiaCCS (2023)
Takao Murakami, Hiromi Arai, Koki Hamada, Takuma Hatano, Makoto Iguchi, Hiroaki Kikuchi, Atsushi Kuromasa, Hiroshi Nakagawa, Yuichi Nakamura, Kenshiro Nishiyama, Ryo Nojima, Hidenobu Oguri, Chiemi Watanabe, Akira Yamada, Takayasu Yamaguchi, Yuji Yamaoka
Designing a Location Trace Anonymization Contest. Proc. Priv. Enhancing Technol. 2023 (1) (2023)
Koji Chida, Koki Hamada, Dai Ikarashi, Ryo Kikuchi, Daniel Genkin, Yehuda Lindell, Ariel Nof
Fast Large-Scale Honest-Majority MPC for Malicious Adversaries. J. Cryptol. 36 (3) (2023)
Koki Hamada, Dai Ikarashi, Ryo Kikuchi, Koji Chida
Efficient decision tree training with new data structure for secure multi-party computation. Proc. Priv. Enhancing Technol. 2023 (1) (2023)
Atsunori Ichikawa, Ilan Komargodski, Koki Hamada, Ryo Kikuchi, Dai Ikarashi
3-Party Secure Computation for RAMs: Optimal and Concretely Efficient. TCC (1) (2023)
Gilad Asharov, Koki Hamada, Ryo Kikuchi, Ariel Nof, Benny Pinkas, Junichi Tomida
Secure Statistical Analysis on Multiple Datasets: Join and Group-By. CCS (2023)
Koki Hamada, Shuichi Miyazaki
Refined Computational Complexities of Hospitals/Residents Problem with Regional Caps. COCOON (2022)
Gilad Asharov, Koki Hamada, Dai Ikarashi, Ryo Kikuchi, Ariel Nof, Benny Pinkas, Katsumi Takahashi, Junichi Tomida
Efficient Secure Three-Party Sorting with Applications to Data Analysis and Heavy Hitters. CCS (2022)
Koji Chida, Koki Hamada, Atsunori Ichikawa, Masanobu Kii, Junichi Tomida
Private Intersection-Weighted-Sum. IACR Cryptol. ePrint Arch. 2022 (2022)
Gilad Asharov, Koki Hamada, Dai Ikarashi, Ryo Kikuchi, Ariel Nof, Benny Pinkas, Katsumi Takahashi, Junichi Tomida
Efficient Secure Three-Party Sorting with Applications to Data Analysis and Heavy Hitters. IACR Cryptol. ePrint Arch. 2022 (2022)
Nuttapong Attrapadung, Koki Hamada, Dai Ikarashi, Ryo Kikuchi, Takahiro Matsuda, Ibuki Mishina, Hiraku Morita, Jacob C. N. Schuldt
Adam in Private: Secure and Fast Training of Deep Neural Networks with Adaptive Moment Estimation. Proc. Priv. Enhancing Technol. 2022 (4) (2022)
Nuttapong Attrapadung, Koki Hamada, Dai Ikarashi, Ryo Kikuchi, Takahiro Matsuda, Ibuki Mishina, Hiraku Morita, Jacob C. N. Schuldt
Adam in Private: Secure and Fast Training of Deep Neural Networks with Adaptive Moment Estimation. IACR Cryptol. ePrint Arch. 2021 (2021)
Koki Hamada, Shuichi Miyazaki
Refined Computational Complexities of Hospitals/Residents Problem with Regional Caps. CoRR (2021)
Nuttapong Attrapadung, Koki Hamada, Dai Ikarashi, Ryo Kikuchi, Takahiro Matsuda, Ibuki Mishina, Hiraku Morita, Jacob C. N. Schuldt
Adam in Private: Secure and Fast Training of Deep Neural Networks with Adaptive Moment Estimation. CoRR (2021)
Koki Hamada, Dai Ikarashi, Ryo Kikuchi, Koji Chida
Efficient decision tree training with new data structure for secure multi-party computation. CoRR (2021)
Koki Hamada, Shuichi Miyazaki, Kazuya Okamoto
Strongly Stable and Maximum Weakly Stable Noncrossing Matchings. Algorithmica 83 (9) (2021)
Takao Murakami, Koki Hamada, Yusuke Kawamoto, Takuma Hatano
Privacy-Preserving Multiple Tensor Factorization for Synthesizing Large-Scale Location Traces with Cluster-Specific Features. Proc. Priv. Enhancing Technol. 2021 (2) (2021)
Takao Murakami, Hiromi Arai, Koki Hamada, Takuma Hatano, Makoto Iguchi, Hiroaki Kikuchi, Atsushi Kuromasa, Hiroshi Nakagawa, Yuichi Nakamura, Kenshiro Nishiyama, Ryo Nojima, Hidenobu Oguri, Chiemi Watanabe, Akira Yamada, Takayasu Yamaguchi, Yuji Yamaoka
Designing a Location Trace Anonymization Contest. CoRR (2021)
Koki Hamada, Shuichi Miyazaki, Kazuya Okamoto
Strongly Stable and Maximum Weakly Stable Noncrossing Matchings. CoRR (2020)
Koki Hamada, Shuichi Miyazaki, Kazuya Okamoto
Strongly Stable and Maximum Weakly Stable Noncrossing Matchings. IWOCA (2020)
Koji Chida, Koki Hamada, Dai Ikarashi, Ryo Kikuchi, Naoto Kiribuchi, Benny Pinkas
An Efficient Secure Three-Party Sorting Protocol with an Honest Majority. IACR Cryptol. ePrint Arch. 2019 (2019)
Takao Murakami, Koki Hamada, Yusuke Kawamoto, Takuma Hatano
Privacy-Preserving Multiple Tensor Factorization for Synthesizing Large-Scale Location Traces. CoRR (2019)
Ryo Kikuchi, Nuttapong Attrapadung, Koki Hamada, Dai Ikarashi, Ai Ishida, Takahiro Matsuda, Yusuke Sakai, Jacob C. N. Schuldt
Field Extension in Secret-Shared Form and Its Applications to Efficient Secure Computation. IACR Cryptol. ePrint Arch. 2019 (2019)
Atsunori Ichikawa, Wakaha Ogata, Koki Hamada, Ryo Kikuchi
Efficient Secure Multi-Party Protocols for Decision Tree Classification. ACISP (2019)
Ryo Kikuchi, Nuttapong Attrapadung, Koki Hamada, Dai Ikarashi, Ai Ishida, Takahiro Matsuda, Yusuke Sakai, Jacob C. N. Schuldt
Field Extension in Secret-Shared Form and Its Applications to Efficient Secure Computation. ACISP (2019)
Koki Hamada, Shuichi Miyazaki, Hiroki Yanagisawa
Strategy-Proof Approximation Algorithms for the Stable Marriage Problem with Ties and Incomplete Lists. ISAAC (2019)
Koki Hamada, Shuichi Miyazaki, Hiroki Yanagisawa
Strategy-Proof Approximation Algorithms for the Stable Marriage Problem with Ties and Incomplete Lists. CoRR (2019)
Ryo Nojima, Hidenobu Oguri, Hiroaki Kikuchi, Hiroshi Nakagawa, Koki Hamada, Takao Murakami, Yuji Yamaoka, Chiemi Watanabe
How to Handle Excessively Anonymized Datasets. J. Inf. Process. 26 (2018)
Ryo Kikuchi, Dai Ikarashi, Takahiro Matsuda, Koki Hamada, Koji Chida
Efficient Bit-Decomposition and Modulus-Conversion Protocols with an Honest Majority. IACR Cryptol. ePrint Arch. 2018 (2018)
Koji Chida, Daniel Genkin, Koki Hamada, Dai Ikarashi, Ryo Kikuchi, Yehuda Lindell, Ariel Nof
Fast Large-Scale Honest-Majority MPC for Malicious Adversaries. CRYPTO (3) (2018)
Hiroaki Kikuchi, Takayasu Yamaguchi, Koki Hamada, Yuji Yamaoka, Hidenobu Oguri, Jun Sakuma
Study on Record Linkage of Anonymizied Data. IEICE Trans. Fundam. Electron. Commun. Comput. Sci. (1) (2018)
Koji Chida, Koki Hamada, Dai Ikarashi, Ryo Kikuchi, Benny Pinkas
High-Throughput Secure AES Computation. WAHC@CCS (2018)
Ryo Kikuchi, Koji Chida, Dai Ikarashi, Koki Hamada
Password-Based Authentication Protocol for Secret-Sharing-Based Multiparty Computation. IEICE Trans. Fundam. Electron. Commun. Comput. Sci. (1) (2018)
Koji Chida, Daniel Genkin, Koki Hamada, Dai Ikarashi, Ryo Kikuchi, Yehuda Lindell, Ariel Nof
Fast Large-Scale Honest-Majority MPC for Malicious Adversaries. IACR Cryptol. ePrint Arch. 2018 (2018)
Ryo Kikuchi, Dai Ikarashi, Takahiro Matsuda, Koki Hamada, Koji Chida
Efficient Bit-Decomposition and Modulus-Conversion Protocols with an Honest Majority. ACISP (2018)
Ryo Kikuchi, Dai Ikarashi, Koji Chida, Koki Hamada, Wakaha Ogata
Computational SS and conversion protocols in both active and passive settings. IET Inf. Secur. 11 (5) (2017)
Eizen Kimura, Koki Hamada, Ryo Kikuchi, Koji Chida, Kazuya Okamoto, Shirou Manabe, Tomohiro Kuroda, Yasushi Matsumura, Toshihiro Takeda, Naoki Mihara
Evaluation of Secure Computation in a Distributed Healthcare Setting. MIE (2016)
Koki Hamada, Kazuo Iwama, Shuichi Miyazaki
The Hospitals/Residents Problem with Lower Quotas. Algorithmica 74 (1) (2016)
Toru Mano, Takeru Inoue, Dai Ikarashi, Koki Hamada, Kimihiro Mizutani, Osamu Akashi
Efficient Virtual Network Optimization Across Multiple Domains Without Revealing Private Information. IEEE Trans. Netw. Serv. Manag. 13 (3) (2016)
Hiroaki Kikuchi, Takayasu Yamaguchi, Koki Hamada, Yuji Yamaoka, Hidenobu Oguri, Jun Sakuma
A Study from the Data Anonymization Competition Pwscup 2015. DPM/QASA@ESORICS (2016)
Hiroaki Kikuchi, Takayasu Yamaguchi, Koki Hamada, Yuji Yamaoka, Hidenobu Oguri, Jun Sakuma
Ice and Fire: Quantifying the Risk of Re-identification and Utility in Data Anonymization. AINA (2016)
Ryo Kikuchi, Dai Ikarashi, Koki Hamada, Koji Chida
Adaptively and Unconditionally Secure Conversion Protocols between Ramp and Linear Secret Sharing. IEICE Trans. Fundam. Electron. Commun. Comput. Sci. (1) (2015)
Ryo Kikuchi, Koji Chida, Dai Ikarashi, Koki Hamada
Practical Password-Based Authentication Protocol for Secret Sharing Based Multiparty Computation. CANS (2015)
Ryo Kikuchi, Koji Chida, Dai Ikarashi, Wakaha Ogata, Koki Hamada, Katsumi Takahashi
Secret Sharing with Share-Conversion: Achieving Small Share-Size and Extendibility to Multiparty Computation. IEICE Trans. Fundam. Electron. Commun. Comput. Sci. (1) (2015)
Toru Mano, Takeru Inoue, Dai Ikarashi, Koki Hamada, Kimihiro Mizutani, Osamu Akashi
Efficient virtual network optimization across multiple domains without revealing private information. ICCCN (2014)
Dai Ikarashi, Ryo Kikuchi, Koki Hamada, Koji Chida
Actively Private and Correct MPC Scheme in t<n/2 from Passively Secure Schemes with Small Overhead. IACR Cryptol. ePrint Arch. 2014 (2014)
Koki Hamada, Dai Ikarashi, Koji Chida, Katsumi Takahashi
Oblivious Radix Sort: An Efficient Sorting Algorithm for Practical Secure Multi-party Computation. IACR Cryptol. ePrint Arch. 2014 (2014)
Koki Hamada
A Picturesque Maze Generation Algorithm with Any Given Endpoints. Inf. Media Technol. 8 (3) (2013)
Ryo Kikuchi, Koji Chida, Dai Ikarashi, Koki Hamada, Katsumi Takahashi
Secret Sharing Schemes with Conversion Protocol to Achieve Short Share-Size and Extendibility to Multiparty Computation. ACISP (2013)
Koki Hamada
A Picturesque Maze Generation Algorithm with Any Given Endpoints. J. Inf. Process. 21 (3) (2013)
Rie Shigetomi Yamaguchi, Keiichi Hirota, Koki Hamada, Katsumi Takahashi, Kazutaka Matsuzaki, Jun Sakuma, Yasuyuki Shirai
Applicability of existing anonymization methods to large location history data in urban travel. SMC (2012)
Koki Hamada, Ryo Kikuchi, Dai Ikarashi, Koji Chida, Katsumi Takahashi
Practically Efficient Multi-party Sorting Protocols from Comparison Sort Algorithms. ICISC (2012)
Koki Hamada, Kazuo Iwama, Shuichi Miyazaki
The Hospitals/Residents Problem with Quota Lower Bounds. ESA (2011)
Koki Hamada, Kazuo Iwama, Shuichi Miyazaki
An improved approximation lower bound for finding almost stable maximum matchings. Inf. Process. Lett. 109 (18) (2009)
Masaaki Iiyama, Koki Hamada, Koh Kakusho, Michihiko Minoh
Usage of needle maps and shadows to overcome depth edges in depth map reconstruction. ICPR (2008)