Koki Hamada

59 papers A* 2A 2B 6C 1Misc 6Journal 36Unranked 6
YearRankTypeTitle / Venue / Authors
2025 — conf
Concretely Efficient Parallel-Accessible DORAM for 100K-Sized Array.
ESORICS (2)
Koki Hamada
2024 J jnl
Refined computational complexities of Hospitals/Residents problem with regional caps.
Theor. Comput. Sci.
Koki Hamada, Shuichi Miyazaki
2024 J jnl
Secure Statistical Analysis on Multiple Datasets: Join and Group-By.
IACR Cryptol. ePrint Arch.
Gilad Asharov, Koki Hamada, Dai Ikarashi, Ryo Kikuchi, Ariel Nof, Benny Pinkas, Junichi Tomida
2023 — conf
3-Party Secure Computation for RAMs: Optimal and Concretely Efficient.
TCC (1)
Atsunori Ichikawa, Ilan Komargodski, Koki Hamada, Ryo Kikuchi, Dai Ikarashi
2023 J jnl
3-Party Secure Computation for RAMs: Optimal and Concretely Efficient.
IACR Cryptol. ePrint Arch.
Atsunori Ichikawa, Ilan Komargodski, Koki Hamada, Ryo Kikuchi, Dai Ikarashi
2023 A conf
Communication-Efficient Inner Product Private Join and Compute with Cardinality.
AsiaCCS
Koji Chida, Koki Hamada, Atsunori Ichikawa, Masanobu Kii, Junichi Tomida
2023 J jnl
Designing a Location Trace Anonymization Contest.
Proc. Priv. Enhancing Technol.
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
2023 J jnl
Efficient decision tree training with new data structure for secure multi-party computation.
Proc. Priv. Enhancing Technol.
Koki Hamada, Dai Ikarashi, Ryo Kikuchi, Koji Chida
2023 J jnl
Fast Large-Scale Honest-Majority MPC for Malicious Adversaries.
J. Cryptol.
Koji Chida, Koki Hamada, Dai Ikarashi, Ryo Kikuchi, Daniel Genkin, Yehuda Lindell, Ariel Nof
2023 A* conf
Secure Statistical Analysis on Multiple Datasets: Join and Group-By.
CCS
Gilad Asharov, Koki Hamada, Ryo Kikuchi, Ariel Nof, Benny Pinkas, Junichi Tomida
2022 J jnl
Adam in Private: Secure and Fast Training of Deep Neural Networks with Adaptive Moment Estimation.
Proc. Priv. Enhancing Technol.
Nuttapong Attrapadung, Koki Hamada, Dai Ikarashi, Ryo Kikuchi, Takahiro Matsuda, Ibuki Mishina, Hiraku Morita, Jacob C. N. Schuldt
2022 A* conf
Efficient Secure Three-Party Sorting with Applications to Data Analysis and Heavy Hitters.
CCS
Gilad Asharov, Koki Hamada, Dai Ikarashi, Ryo Kikuchi, Ariel Nof, Benny Pinkas, Katsumi Takahashi, Junichi Tomida
2022 J jnl
Efficient Secure Three-Party Sorting with Applications to Data Analysis and Heavy Hitters.
IACR Cryptol. ePrint Arch.
Gilad Asharov, Koki Hamada, Dai Ikarashi, Ryo Kikuchi, Ariel Nof, Benny Pinkas, Katsumi Takahashi, Junichi Tomida
2022 J jnl
Private Intersection-Weighted-Sum.
IACR Cryptol. ePrint Arch.
Koji Chida, Koki Hamada, Atsunori Ichikawa, Masanobu Kii, Junichi Tomida
2022 Misc conf
Refined Computational Complexities of Hospitals/Residents Problem with Regional Caps.
COCOON
Koki Hamada, Shuichi Miyazaki
2021 J jnl
Adam in Private: Secure and Fast Training of Deep Neural Networks with Adaptive Moment Estimation.
CoRR
Nuttapong Attrapadung, Koki Hamada, Dai Ikarashi, Ryo Kikuchi, Takahiro Matsuda, Ibuki Mishina, Hiraku Morita, Jacob C. N. Schuldt
2021 J jnl
Adam in Private: Secure and Fast Training of Deep Neural Networks with Adaptive Moment Estimation.
IACR Cryptol. ePrint Arch.
Nuttapong Attrapadung, Koki Hamada, Dai Ikarashi, Ryo Kikuchi, Takahiro Matsuda, Ibuki Mishina, Hiraku Morita, Jacob C. N. Schuldt
2021 J jnl
Designing a Location Trace Anonymization Contest.
CoRR
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
2021 J jnl
Efficient decision tree training with new data structure for secure multi-party computation.
CoRR
Koki Hamada, Dai Ikarashi, Ryo Kikuchi, Koji Chida
2021 J jnl
Privacy-Preserving Multiple Tensor Factorization for Synthesizing Large-Scale Location Traces with Cluster-Specific Features.
Proc. Priv. Enhancing Technol.
Takao Murakami, Koki Hamada, Yusuke Kawamoto, Takuma Hatano
2021 J jnl
Refined Computational Complexities of Hospitals/Residents Problem with Regional Caps.
CoRR
Koki Hamada, Shuichi Miyazaki
2021 J jnl
Strongly Stable and Maximum Weakly Stable Noncrossing Matchings.
Algorithmica
Koki Hamada, Shuichi Miyazaki, Kazuya Okamoto
2020 C conf
Strongly Stable and Maximum Weakly Stable Noncrossing Matchings.
IWOCA
Koki Hamada, Shuichi Miyazaki, Kazuya Okamoto
2020 J jnl
Strongly Stable and Maximum Weakly Stable Noncrossing Matchings.
CoRR
Koki Hamada, Shuichi Miyazaki, Kazuya Okamoto
2019 J jnl
An Efficient Secure Three-Party Sorting Protocol with an Honest Majority.
IACR Cryptol. ePrint Arch.
Koji Chida, Koki Hamada, Dai Ikarashi, Ryo Kikuchi, Naoto Kiribuchi, Benny Pinkas
2019 Misc conf
Efficient Secure Multi-Party Protocols for Decision Tree Classification.
ACISP
Atsunori Ichikawa, Wakaha Ogata, Koki Hamada, Ryo Kikuchi
2019 Misc conf
Field Extension in Secret-Shared Form and Its Applications to Efficient Secure Computation.
ACISP
Ryo Kikuchi, Nuttapong Attrapadung, Koki Hamada, Dai Ikarashi, Ai Ishida, Takahiro Matsuda, Yusuke Sakai, Jacob C. N. Schuldt
2019 J jnl
Field Extension in Secret-Shared Form and Its Applications to Efficient Secure Computation.
IACR Cryptol. ePrint Arch.
Ryo Kikuchi, Nuttapong Attrapadung, Koki Hamada, Dai Ikarashi, Ai Ishida, Takahiro Matsuda, Yusuke Sakai, Jacob C. N. Schuldt
2019 J jnl
Privacy-Preserving Multiple Tensor Factorization for Synthesizing Large-Scale Location Traces.
CoRR
Takao Murakami, Koki Hamada, Yusuke Kawamoto, Takuma Hatano
2019 B conf
Strategy-Proof Approximation Algorithms for the Stable Marriage Problem with Ties and Incomplete Lists.
ISAAC
Koki Hamada, Shuichi Miyazaki, Hiroki Yanagisawa
2019 J jnl
Strategy-Proof Approximation Algorithms for the Stable Marriage Problem with Ties and Incomplete Lists.
CoRR
Koki Hamada, Shuichi Miyazaki, Hiroki Yanagisawa
2018 Misc conf
Efficient Bit-Decomposition and Modulus-Conversion Protocols with an Honest Majority.
ACISP
Ryo Kikuchi, Dai Ikarashi, Takahiro Matsuda, Koki Hamada, Koji Chida
2018 J jnl
Efficient Bit-Decomposition and Modulus-Conversion Protocols with an Honest Majority.
IACR Cryptol. ePrint Arch.
Ryo Kikuchi, Dai Ikarashi, Takahiro Matsuda, Koki Hamada, Koji Chida
2018 — conf
Fast Large-Scale Honest-Majority MPC for Malicious Adversaries.
CRYPTO (3)
Koji Chida, Daniel Genkin, Koki Hamada, Dai Ikarashi, Ryo Kikuchi, Yehuda Lindell, Ariel Nof
2018 J jnl
Fast Large-Scale Honest-Majority MPC for Malicious Adversaries.
IACR Cryptol. ePrint Arch.
Koji Chida, Daniel Genkin, Koki Hamada, Dai Ikarashi, Ryo Kikuchi, Yehuda Lindell, Ariel Nof
2018 — conf
High-Throughput Secure AES Computation.
WAHC@CCS
Koji Chida, Koki Hamada, Dai Ikarashi, Ryo Kikuchi, Benny Pinkas
2018 J jnl
How to Handle Excessively Anonymized Datasets.
J. Inf. Process.
Ryo Nojima, Hidenobu Oguri, Hiroaki Kikuchi, Hiroshi Nakagawa, Koki Hamada, Takao Murakami, Yuji Yamaoka, Chiemi Watanabe
2018 J jnl
Password-Based Authentication Protocol for Secret-Sharing-Based Multiparty Computation.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Ryo Kikuchi, Koji Chida, Dai Ikarashi, Koki Hamada
2018 J jnl
Study on Record Linkage of Anonymizied Data.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Hiroaki Kikuchi, Takayasu Yamaguchi, Koki Hamada, Yuji Yamaoka, Hidenobu Oguri, Jun Sakuma
2017 J jnl
Computational SS and conversion protocols in both active and passive settings.
IET Inf. Secur.
Ryo Kikuchi, Dai Ikarashi, Koji Chida, Koki Hamada, Wakaha Ogata
2016 — conf
A Study from the Data Anonymization Competition Pwscup 2015.
DPM/QASA@ESORICS
Hiroaki Kikuchi, Takayasu Yamaguchi, Koki Hamada, Yuji Yamaoka, Hidenobu Oguri, Jun Sakuma
2016 J jnl
Efficient Virtual Network Optimization Across Multiple Domains Without Revealing Private Information.
IEEE Trans. Netw. Serv. Manag.
Toru Mano, Takeru Inoue, Dai Ikarashi, Koki Hamada, Kimihiro Mizutani, Osamu Akashi
2016 — conf
Evaluation of Secure Computation in a Distributed Healthcare Setting.
MIE
Eizen Kimura, Koki Hamada, Ryo Kikuchi, Koji Chida, Kazuya Okamoto, Shirou Manabe, Tomohiro Kuroda, Yasushi Matsumura, Toshihiro Takeda, Naoki Mihara
2016 B conf
Ice and Fire: Quantifying the Risk of Re-identification and Utility in Data Anonymization.
AINA
Hiroaki Kikuchi, Takayasu Yamaguchi, Koki Hamada, Yuji Yamaoka, Hidenobu Oguri, Jun Sakuma
2016 J jnl
The Hospitals/Residents Problem with Lower Quotas.
Algorithmica
Koki Hamada, Kazuo Iwama, Shuichi Miyazaki
2015 J jnl
Adaptively and Unconditionally Secure Conversion Protocols between Ramp and Linear Secret Sharing.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Ryo Kikuchi, Dai Ikarashi, Koki Hamada, Koji Chida
2015 B conf
Practical Password-Based Authentication Protocol for Secret Sharing Based Multiparty Computation.
CANS
Ryo Kikuchi, Koji Chida, Dai Ikarashi, Koki Hamada
2015 J jnl
Secret Sharing with Share-Conversion: Achieving Small Share-Size and Extendibility to Multiparty Computation.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Ryo Kikuchi, Koji Chida, Dai Ikarashi, Wakaha Ogata, Koki Hamada, Katsumi Takahashi
2014 J jnl
Actively Private and Correct MPC Scheme in t<n/2 from Passively Secure Schemes with Small Overhead.
IACR Cryptol. ePrint Arch.
Dai Ikarashi, Ryo Kikuchi, Koki Hamada, Koji Chida
2014 B conf
Efficient virtual network optimization across multiple domains without revealing private information.
ICCCN
Toru Mano, Takeru Inoue, Dai Ikarashi, Koki Hamada, Kimihiro Mizutani, Osamu Akashi
2014 J jnl
Oblivious Radix Sort: An Efficient Sorting Algorithm for Practical Secure Multi-party Computation.
IACR Cryptol. ePrint Arch.
Koki Hamada, Dai Ikarashi, Koji Chida, Katsumi Takahashi
2013 J jnl
A Picturesque Maze Generation Algorithm with Any Given Endpoints.
Inf. Media Technol.
Koki Hamada
2013 J jnl
A Picturesque Maze Generation Algorithm with Any Given Endpoints.
J. Inf. Process.
Koki Hamada
2013 Misc conf
Secret Sharing Schemes with Conversion Protocol to Achieve Short Share-Size and Extendibility to Multiparty Computation.
ACISP
Ryo Kikuchi, Koji Chida, Dai Ikarashi, Koki Hamada, Katsumi Takahashi
2012 B conf
Applicability of existing anonymization methods to large location history data in urban travel.
SMC
Rie Shigetomi Yamaguchi, Keiichi Hirota, Koki Hamada, Katsumi Takahashi, Kazutaka Matsuzaki, Jun Sakuma, Yasuyuki Shirai
2012 Misc conf
Practically Efficient Multi-party Sorting Protocols from Comparison Sort Algorithms.
ICISC
Koki Hamada, Ryo Kikuchi, Dai Ikarashi, Koji Chida, Katsumi Takahashi
2011 A conf
The Hospitals/Residents Problem with Quota Lower Bounds.
ESA
Koki Hamada, Kazuo Iwama, Shuichi Miyazaki
2009 J jnl
An improved approximation lower bound for finding almost stable maximum matchings.
Inf. Process. Lett.
Koki Hamada, Kazuo Iwama, Shuichi Miyazaki
2008 B conf
Usage of needle maps and shadows to overcome depth edges in depth map reconstruction.
ICPR
Masaaki Iiyama, Koki Hamada, Koh Kakusho, Michihiko Minoh