Koki Hamada

According to our database, Koki Hamada authored at least 42 papers between 2008 and 2025.

Collaborative distances:

• Dijkstra number of four.
• Erdős number of three.

2025

Concretely Efficient Parallel-Accessible DORAM for 100K-Sized Array.

Koki Hamada

Proceedings of the Computer Security - ESORICS 2025, 2025

2024

Secure Statistical Analysis on Multiple Datasets: Join and Group-By.

Gilad Asharov, Koki Hamada, Dai Ikarashi, Ryo Kikuchi, Ariel Nof, Benny Pinkas, Junichi Tomida

IACR Cryptol. ePrint Arch., 2024

2023

Designing a Location Trace Anonymization Contest.

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

Proc. Priv. Enhancing Technol., January, 2023

Efficient decision tree training with new data structure for secure multi-party computation.

Koki Hamada, Dai Ikarashi, Ryo Kikuchi, Koji Chida

Proc. Priv. Enhancing Technol., January, 2023

3-Party Secure Computation for RAMs: Optimal and Concretely Efficient.

Atsunori Ichikawa, Ilan Komargodski, Koki Hamada, Ryo Kikuchi, Dai Ikarashi

Proceedings of the Theory of Cryptography - 21st International Conference, 2023

Secure Statistical Analysis on Multiple Datasets: Join and Group-By.

Gilad Asharov, Koki Hamada, Ryo Kikuchi, Ariel Nof, Benny Pinkas, Junichi Tomida

Proceedings of the 2023 ACM SIGSAC Conference on Computer and Communications Security, 2023

Communication-Efficient Inner Product Private Join and Compute with Cardinality.

Koji Chida, Koki Hamada, Atsunori Ichikawa, Masanobu Kii, Junichi Tomida

Proceedings of the 2023 ACM Asia Conference on Computer and Communications Security, 2023

2022

Private Intersection-Weighted-Sum.

Koji Chida, Koki Hamada, Atsunori Ichikawa, Masanobu Kii, Junichi Tomida

IACR Cryptol. ePrint Arch., 2022

Refined Computational Complexities of Hospitals/Residents Problem with Regional Caps.

Koki Hamada, Shuichi Miyazaki

Proceedings of the Computing and Combinatorics - 28th International Conference, 2022

Efficient Secure Three-Party Sorting with Applications to Data Analysis and Heavy Hitters.

Gilad Asharov, Koki Hamada, Dai Ikarashi, Ryo Kikuchi, Ariel Nof, Benny Pinkas, Katsumi Takahashi, Junichi Tomida

Proceedings of the 2022 ACM SIGSAC Conference on Computer and Communications Security, 2022

2021

Privacy-Preserving Multiple Tensor Factorization for Synthesizing Large-Scale Location Traces with Cluster-Specific Features.

Takao Murakami, Koki Hamada, Yusuke Kawamoto, Takuma Hatano

Proc. Priv. Enhancing Technol., 2021

Adam in Private: Secure and Fast Training of Deep Neural Networks with Adaptive Moment Estimation.

Nuttapong Attrapadung, Koki Hamada, Dai Ikarashi, Ryo Kikuchi, Takahiro Matsuda, Ibuki Mishina, Hiraku Morita, Jacob C. N. Schuldt

IACR Cryptol. ePrint Arch., 2021

2020

Strongly Stable and Maximum Weakly Stable Noncrossing Matchings.

Koki Hamada, Shuichi Miyazaki, Kazuya Okamoto

Proceedings of the Combinatorial Algorithms - 31st International Workshop, 2020

2019

An Efficient Secure Three-Party Sorting Protocol with an Honest Majority.

Koji Chida, Koki Hamada, Dai Ikarashi, Ryo Kikuchi, Naoto Kiribuchi, Benny Pinkas

IACR Cryptol. ePrint Arch., 2019

Privacy-Preserving Multiple Tensor Factorization for Synthesizing Large-Scale Location Traces.

Takao Murakami, Koki Hamada, Yusuke Kawamoto, Takuma Hatano

CoRR, 2019

Strategy-Proof Approximation Algorithms for the Stable Marriage Problem with Ties and Incomplete Lists.

Koki Hamada, Shuichi Miyazaki, Hiroki Yanagisawa

Proceedings of the 30th International Symposium on Algorithms and Computation, 2019

Field Extension in Secret-Shared Form and Its Applications to Efficient Secure Computation.

Ryo Kikuchi, Nuttapong Attrapadung, Koki Hamada, Dai Ikarashi, Ai Ishida, Takahiro Matsuda, Yusuke Sakai, Jacob C. N. Schuldt

Proceedings of the Information Security and Privacy - 24th Australasian Conference, 2019

Efficient Secure Multi-Party Protocols for Decision Tree Classification.

Atsunori Ichikawa, Wakaha Ogata, Koki Hamada, Ryo Kikuchi

Proceedings of the Information Security and Privacy - 24th Australasian Conference, 2019

2018

How to Handle Excessively Anonymized Datasets.

Ryo Nojima, Hidenobu Oguri, Hiroaki Kikuchi, Hiroshi Nakagawa, Koki Hamada, Takao Murakami, Yuji Yamaoka, Chiemi Watanabe

J. Inf. Process., 2018

Study on Record Linkage of Anonymizied Data.

Hiroaki Kikuchi, Takayasu Yamaguchi, Koki Hamada, Yuji Yamaoka, Hidenobu Oguri, Jun Sakuma

IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2018

Password-Based Authentication Protocol for Secret-Sharing-Based Multiparty Computation.

Ryo Kikuchi, Koji Chida, Dai Ikarashi, Koki Hamada

IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2018

Fast Large-Scale Honest-Majority MPC for Malicious Adversaries.

Koji Chida, Daniel Genkin, Koki Hamada, Dai Ikarashi, Ryo Kikuchi, Yehuda Lindell, Ariel Nof

Proceedings of the Advances in Cryptology - CRYPTO 2018, 2018

High-Throughput Secure AES Computation.

Koji Chida, Koki Hamada, Dai Ikarashi, Ryo Kikuchi, Benny Pinkas

Proceedings of the 6th Workshop on Encrypted Computing & Applied Homomorphic Cryptography, 2018

Efficient Bit-Decomposition and Modulus-Conversion Protocols with an Honest Majority.

Ryo Kikuchi, Dai Ikarashi, Takahiro Matsuda, Koki Hamada, Koji Chida

Proceedings of the Information Security and Privacy - 23rd Australasian Conference, 2018

2017

Computational SS and conversion protocols in both active and passive settings.

Ryo Kikuchi, Dai Ikarashi, Koji Chida, Koki Hamada, Wakaha Ogata

IET Inf. Secur., 2017

2016

The Hospitals/Residents Problem with Lower Quotas.

Koki Hamada, Kazuo Iwama, Shuichi Miyazaki

Algorithmica, 2016

Evaluation of Secure Computation in a Distributed Healthcare Setting.

Eizen Kimura, Koki Hamada, Ryo Kikuchi, Koji Chida, Kazuya Okamoto, Shirou Manabe, Tomohiro Kuroda, Yasushi Matsumura, Toshihiro Takeda, Naoki Mihara

Proceedings of the Exploring Complexity in Health: An Interdisciplinary Systems Approach - Proceedings of MIE2016 at HEC2016, Munich, Germany, 28 August, 2016

A Study from the Data Anonymization Competition Pwscup 2015.

Hiroaki Kikuchi, Takayasu Yamaguchi, Koki Hamada, Yuji Yamaoka, Hidenobu Oguri, Jun Sakuma

Proceedings of the Data Privacy Management and Security Assurance, 2016

Ice and Fire: Quantifying the Risk of Re-identification and Utility in Data Anonymization.

Hiroaki Kikuchi, Takayasu Yamaguchi, Koki Hamada, Yuji Yamaoka, Hidenobu Oguri, Jun Sakuma

Proceedings of the 30th IEEE International Conference on Advanced Information Networking and Applications, 2016

2015

Adaptively and Unconditionally Secure Conversion Protocols between Ramp and Linear Secret Sharing.

Ryo Kikuchi, Dai Ikarashi, Koki Hamada, Koji Chida

IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2015

Secret Sharing with Share-Conversion: Achieving Small Share-Size and Extendibility to Multiparty Computation.

Ryo Kikuchi, Koji Chida, Dai Ikarashi, Wakaha Ogata, Koki Hamada, Katsumi Takahashi

IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2015

Practical Password-Based Authentication Protocol for Secret Sharing Based Multiparty Computation.

Ryo Kikuchi, Koji Chida, Dai Ikarashi, Koki Hamada

Proceedings of the Cryptology and Network Security - 14th International Conference, 2015

2014

Actively Private and Correct MPC Scheme in t<n/2 from Passively Secure Schemes with Small Overhead.

Dai Ikarashi, Ryo Kikuchi, Koki Hamada, Koji Chida

IACR Cryptol. ePrint Arch., 2014

Oblivious Radix Sort: An Efficient Sorting Algorithm for Practical Secure Multi-party Computation.

Koki Hamada, Dai Ikarashi, Koji Chida, Katsumi Takahashi

IACR Cryptol. ePrint Arch., 2014

Efficient virtual network optimization across multiple domains without revealing private information.

Toru Mano, Takeru Inoue, Dai Ikarashi, Koki Hamada, Kimihiro Mizutani, Osamu Akashi

Proceedings of the 23rd International Conference on Computer Communication and Networks, 2014

2013

A Picturesque Maze Generation Algorithm with Any Given Endpoints.

Koki Hamada

Inf. Media Technol., 2013

Secret Sharing Schemes with Conversion Protocol to Achieve Short Share-Size and Extendibility to Multiparty Computation.

Ryo Kikuchi, Koji Chida, Dai Ikarashi, Koki Hamada, Katsumi Takahashi

Proceedings of the Information Security and Privacy - 18th Australasian Conference, 2013

2012

Applicability of existing anonymization methods to large location history data in urban travel.

Rie Shigetomi Yamaguchi, Keiichi Hirota, Koki Hamada, Katsumi Takahashi, Kazutaka Matsuzaki, Jun Sakuma, Yasuyuki Shirai

Proceedings of the IEEE International Conference on Systems, Man, and Cybernetics, 2012

Practically Efficient Multi-party Sorting Protocols from Comparison Sort Algorithms.

Koki Hamada, Ryo Kikuchi, Dai Ikarashi, Koji Chida, Katsumi Takahashi

Proceedings of the Information Security and Cryptology - ICISC 2012, 2012

2011

The Hospitals/Residents Problem with Quota Lower Bounds.

Koki Hamada, Kazuo Iwama, Shuichi Miyazaki

Proceedings of the Algorithms - ESA 2011, 2011

2009

An improved approximation lower bound for finding almost stable maximum matchings.

Koki Hamada, Kazuo Iwama, Shuichi Miyazaki

Inf. Process. Lett., 2009

2008

Usage of needle maps and shadows to overcome depth edges in depth map reconstruction.

Masaaki Iiyama, Koki Hamada, Koh Kakusho, Michihiko Minoh

Proceedings of the 19th International Conference on Pattern Recognition (ICPR 2008), 2008