Koji Nuida

149 papers A 4B 5C 9Misc 16Journal 88Unranked 27
YearRankTypeTitle / Venue / Authors
2026 J jnl
Multi-Key Homomorphic Encryption with Threshold Re-Encryption via (Replicated) Additive Secret Sharing.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Akira Nakashima, Yukimasa Sugizaki, Hikaru Tsuchida, Takuya Hayashi, Koji Nuida, Kengo Mori, Toshiyuki Isshiki
2026 J jnl
On Definitions for Semi-Honest Secure Multiparty Computation.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Koji Nuida
2025 J jnl
A Note on Single-Cut Full-Open Protocols.
CoRR
Kazumasa Shinagawa, Koji Nuida
2025 J jnl
Card-Based Protocol Counting Connected Components of Graphs.
IACR Cryptol. ePrint Arch.
Koji Nuida
2025 J jnl
Card-Based Protocol Counting Connected Components of Graphs.
New Gener. Comput.
Koji Nuida
2025 A conf
Card-Based Protocols Imply PSM Protocols.
STACS
Kazumasa Shinagawa, Koji Nuida
2025 B conf
Cyclic Equalizability of Words and Its Application to Card-Based Cryptography.
FCT
Kazumasa Shinagawa, Koji Nuida
2025 J jnl
Cyclic Equalizability of Words and Its Application to Card-Based Cryptography.
CoRR
Kazumasa Shinagawa, Koji Nuida
2025 Misc conf
Efficient Card-Based Protocols for Symmetric and Partially Doubly Symmetric Functions.
IWSEC
Shota Ikeda, Yoshihiro Takahashi, Kazumasa Shinagawa, Koji Nuida
2025 — conf
Efficient Theta-Based Algorithms for Computing (ℓ , ℓ )-Isogenies on Kummer Surfaces for Arbitrary Odd ℓ.
PQCrypto (2)
Ryo Yoshizumi, Hiroshi Onuki, Ryo Ohashi, Momonari Kudo, Koji Nuida
2025 Misc conf
Improved Private Simultaneous Messages Protocols for Symmetric Functions with Universal Reconstruction.
IWSEC
Koji Nuida
2025 J jnl
Improved Private Simultaneous Messages Protocols for Symmetric Functions with Universal Reconstruction.
IACR Cryptol. ePrint Arch.
Koji Nuida
2025 J jnl
List Decoding in Private Information Retrieval: Formal Definition and Efficient Constructions.
IACR Cryptol. ePrint Arch.
Reo Eriguchi, Kaoru Kurosawa, Koji Nuida
2024 J jnl
Card-Based Protocols for Private Set Intersection and Union.
New Gener. Comput.
Anastasiia Doi, Tomoki Ono, Yoshiki Abe, Takeshi Nakai, Kazumasa Shinagawa, Yohei Watanabe, Koji Nuida, Mitsugu Iwamoto
2024 J jnl
Correlated Randomness Reduction in Domain-Restricted Secure Two-Party Computation.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Keitaro Hiwatashi, Koji Nuida
2024 — conf
Efficient and Generic Methods to Achieve Active Security in Private Information Retrieval and More Advanced Database Search.
EUROCRYPT (5)
Reo Eriguchi, Kaoru Kurosawa, Koji Nuida
2024 J jnl
Efficient and Generic Methods to Achieve Active Security in Private Information Retrieval and More Advanced Database Search.
IACR Cryptol. ePrint Arch.
Reo Eriguchi, Kaoru Kurosawa, Koji Nuida
2024 J jnl
Efficient theta-based algorithms for computing (ℓ, ℓ)-isogenies on Kummer surfaces for arbitrary odd ℓ.
IACR Cryptol. ePrint Arch.
Ryo Yoshizumi, Hiroshi Onuki, Ryo Ohashi, Momonari Kudo, Koji Nuida
2024 Misc conf
How to Covertly and Uniformly Scramble the 15 Puzzle and Rubik's Cube.
FUN
Kazumasa Shinagawa, Kazuki Kanai, Kengo Miyamoto, Koji Nuida
2024 — conf
Multi-key Homomorphic Encryption with Threshold Re-encryption.
SAC (1)
Akira Nakashima, Yukimasa Sugizaki, Hikaru Tsuchida, Takuya Hayashi, Koji Nuida, Kengo Mori, Toshiyuki Isshiki
2024 J jnl
On Extension of Evaluation Algorithms in Keyed-Homomorphic Encryption.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Hirotomo Shinoki, Koji Nuida
2024 J jnl
On Weighted-Sum Orthogonal Latin Squares and Secret Sharing.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Koji Nuida, Tomoko Adachi
2024 — conf
Parameterizing Time-Memory Trade-Off for Flexible Implementation of CRYSTALS-Dilithium.
SecITC
Yasushi Takahashi, Naohisa Nishida, Yuji Unagami, Saburo Toyonaga, Naoto Yanai, Yasuhiko Ikematsu, Koji Nuida, Masaya Yasuda
2023 J jnl
Efficient Card-Based Millionaires' Protocols via Non-Binary Input Encoding.
IACR Cryptol. ePrint Arch.
Koji Nuida
2023 Misc conf
Efficient Card-Based Millionaires' Protocols via Non-binary Input Encoding.
IWSEC
Koji Nuida
2023 J jnl
Efficient Construction of CGL Hash Function Using Legendre Curves.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Yuji Hashimoto, Koji Nuida
2023 J jnl
Efficient Noise Generation Protocols for Differentially Private Multiparty Computation.
IEEE Trans. Dependable Secur. Comput.
Reo Eriguchi, Atsunori Ichikawa, Noboru Kunihiro, Koji Nuida
2023 J jnl
Efficient Supersingularity Testing of Elliptic Curves Using Legendre Curves.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Yuji Hashimoto, Koji Nuida
2023 — conf
Explicit Lower Bounds for Communication Complexity of PSM for Concrete Functions.
INDOCRYPT (2)
Kazumasa Shinagawa, Koji Nuida
2023 J jnl
Explicit Lower Bounds for Communication Complexity of PSM for Concrete Functions.
IACR Cryptol. ePrint Arch.
Kazumasa Shinagawa, Koji Nuida
2023 B conf
Explicit and Nearly Tight Lower Bound for 2-Party Perfectly Secure FSS.
ACNS
Keitaro Hiwatashi, Koji Nuida
2023 A conf
Exponential Correlated Randomness Is Necessary in Communication-Optimal Perfectly Secure Two-Party Computation.
ITC
Keitaro Hiwatashi, Koji Nuida
2023 J jnl
Linear Algebraic Approach to Strongly Secure Ramp Secret Sharing for General Access Structures with Application to Symmetric PIR.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Reo Eriguchi, Noboru Kunihiro, Koji Nuida
2023 J jnl
Multiplicative and verifiably multiplicative secret sharing for multipartite adversary structures.
Des. Codes Cryptogr.
Reo Eriguchi, Noboru Kunihiro, Koji Nuida
2023 J jnl
New Generic Constructions of Error-Correcting PIR and Efficient Instantiations.
IACR Cryptol. ePrint Arch.
Reo Eriguchi, Kaoru Kurosawa, Koji Nuida
2023 J jnl
On Weighted-Sum Orthogonal Latin Squares and Secret Sharing.
IACR Cryptol. ePrint Arch.
Koji Nuida, Tomoko Adachi
2023 J jnl
Private simultaneous messages based on quadratic residues.
Des. Codes Cryptogr.
Kazumasa Shinagawa, Reo Eriguchi, Shohei Satake, Koji Nuida
2023 J jnl
Short Lattice Signature Scheme with Tighter Reduction under Ring-SIS Assumption.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Kaisei Kajita, Go Ohtake, Kazuto Ogawa, Koji Nuida, Tsuyoshi Takagi
2023 — conf
Threshold Fully Homomorphic Encryption Over the Torus.
ESORICS (1)
Yukimasa Sugizaki, Hikaru Tsuchida, Takuya Hayashi, Koji Nuida, Akira Nakashima, Toshiyuki Isshiki, Kengo Mori
2023 J jnl
Uniform Cyclic Group Factorizations of Finite Groups.
CoRR
Kazuki Kanai, Kengo Miyamoto, Koji Nuida, Kazumasa Shinagawa
2022 J jnl
An Efficient Secure Division Protocol Using Approximate Multi-Bit Product and New Constant-Round Building Blocks.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Keitaro Hiwatashi, Satsuya Ohata, Koji Nuida
2022 C conf
Card-based Cryptographic Protocols for Private Set Intersection.
ISITA
Anastasiia Doi, Tomoki Ono, Takeshi Nakai, Kazumasa Shinagawa, Yohei Watanabe, Koji Nuida, Mitsugu Iwamoto
2022 Misc conf
Chosen Ciphertext Secure Keyed Two-Level Homomorphic Encryption.
ACISP
Yusaku Maeda, Koji Nuida
2022 Misc conf
Computational Irrelevancy: Bridging the Gap Between Pseudo- and Real Randomness in MPC Protocols.
IWSEC
Nariyasu Heseri, Koji Nuida
2022 J jnl
Efficiency and Accuracy Improvements of Secure Floating-Point Addition over Secret Sharing.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Kota Sasaki, Koji Nuida
2022 J jnl
Efficient Noise Generation Protocols for Differentially Private Multiparty Computation.
IACR Cryptol. ePrint Arch.
Reo Eriguchi, Atsunori Ichikawa, Noboru Kunihiro, Koji Nuida
2022 — conf
How to Handle Invalid Queries for Malicious-Private Protocols Based on Homomorphic Encryption.
APKC@AsiaCCS
Koji Nuida
2022 A conf
Multi-Server PIR with Full Error Detection and Limited Error Correction.
ITC
Reo Eriguchi, Kaoru Kurosawa, Koji Nuida
2022 J jnl
Multi-Server PIR with Full Error Detection and Limited Error Correction.
IACR Cryptol. ePrint Arch.
Reo Eriguchi, Kaoru Kurosawa, Koji Nuida
2022 J jnl
Multiplicative and Verifiably Multiplicative Secret Sharing for Multipartite Adversary Structures.
IACR Cryptol. ePrint Arch.
Reo Eriguchi, Noboru Kunihiro, Koji Nuida
2022 J jnl
On Compression Functions over Small Groups with Applications to Cryptography.
CoRR
Koji Nuida
2022 Misc conf
On Extension of Evaluation Algorithms in Keyed-Homomorphic Encryption.
IWSEC
Hirotomo Shinoki, Koji Nuida
2022 J jnl
On Extension of Evaluation Algorithms in Keyed-Homomorphic Encryption.
IACR Cryptol. ePrint Arch.
Hirotomo Shinoki, Koji Nuida
2022 J jnl
On the Optimal Communication Complexity of Error-Correcting Multi-Server PIR.
IACR Cryptol. ePrint Arch.
Reo Eriguchi, Kaoru Kurosawa, Koji Nuida
2022 — conf
On the Optimal Communication Complexity of Error-Correcting Multi-server PIR.
TCC (3)
Reo Eriguchi, Kaoru Kurosawa, Koji Nuida
2022 J jnl
Private Simultaneous Messages Based on Quadratic Residues.
CoRR
Kazumasa Shinagawa, Reo Eriguchi, Shohei Satake, Koji Nuida
2022 J jnl
Short Lattice Signature Scheme with Tighter Reduction under Ring-SIS Assumption.
IACR Cryptol. ePrint Arch.
Kaisei Kajita, Go Ohtake, Kazuto Ogawa, Koji Nuida, Tsuyoshi Takagi
2022 J jnl
Single-shuffle Full-open Card-based Protocols Imply Private Simultaneous Messages Protocols.
IACR Cryptol. ePrint Arch.
Kazumasa Shinagawa, Koji Nuida
2022 J jnl
Tight Security of Twin-DH Hashed ElGamal KEM in Multi-User Setting.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Yuji Hashimoto, Koji Nuida, Goichiro Hanaoka
2021 J jnl
A single shuffle is enough for secure card-based computation of any Boolean circuit.
Discret. Appl. Math.
Kazumasa Shinagawa, Koji Nuida
2021 A conf
Accelerating Secure (2+1)-Party Computation by Insecure but Efficient Building Blocks.
AsiaCCS
Keitaro Hiwatashi, Ken Ogura, Satsuya Ohata, Koji Nuida
2021 J jnl
An Improvement of a Key Exchange Protocol Relying on Polynomial Maps.
CoRR
Keita Suzuki, Koji Nuida
2021 J jnl
Chosen Ciphertext Secure Keyed Two-Level Homomorphic Encryption.
IACR Cryptol. ePrint Arch.
Yusaku Maeda, Koji Nuida
2021 J jnl
Computational Irrelevancy: Bridging the Gap between Pseudo- and Real Randomness in MPC Protocols.
IACR Cryptol. ePrint Arch.
Nariyasu Heseri, Koji Nuida
2021 — conf
Cryptographic Pseudorandom Generators Can Make Cryptosystems Problematic.
Public Key Cryptography (2)
Koji Nuida
2021 C conf
Efficient Fully Anonymous Public-Key Trace and Revoke with Adaptive IND-CCA Security.
ISPEC
Mriganka Mandal, Ramprasad Sarkar, Junbeom Hur, Koji Nuida
2021 — conf
Efficient Noise Generation to Achieve Differential Privacy with Applications to Secure Multiparty Computation.
Financial Cryptography (1)
Reo Eriguchi, Atsunori Ichikawa, Noboru Kunihiro, Koji Nuida
2021 J jnl
Halt Properties and Complexity Evaluations for Optimal DeepLLL Algorithm Families.
CoRR
Takuto Odagawa, Koji Nuida
2021 — conf
Homomorphic Secret Sharing for Multipartite and General Adversary Structures Supporting Parallel Evaluation of Low-Degree Polynomials.
ASIACRYPT (2)
Reo Eriguchi, Koji Nuida
2021 J jnl
Homomorphic Secret Sharing for Multipartite and General Adversary Structures Supporting Parallel Evaluation of Low-degree Polynomials.
IACR Cryptol. ePrint Arch.
Reo Eriguchi, Koji Nuida
2021 J jnl
How to Handle Invalid Queries for Malicious-Private Protocols Based on Homomorphic Encryption.
IACR Cryptol. ePrint Arch.
Koji Nuida
2021 B conf
Improved Supersingularity Testing of Elliptic Curves Using Legendre Form.
CASC
Yuji Hashimoto, Koji Nuida
2021 — conf
Non-interactive Secure Multiparty Computation for Symmetric Functions, Revisited: More Efficient Constructions and Extensions.
CRYPTO (2)
Reo Eriguchi, Kazuma Ohara, Shota Yamada, Koji Nuida
2020 C conf
A Linear Algebraic Approach to Strongly Secure Ramp Secret Sharing for General Access Structures.
ISITA
Reo Eriguchi, Noboru Kunihiro, Koji Nuida
2020 — conf
An Efficient Secure Division Protocol Using Approximate Multi-bit Product and New Constant-Round Building Blocks.
ACNS (1)
Keitaro Hiwatashi, Satsuya Ohata, Koji Nuida
2020 J jnl
An Elementary Linear-Algebraic Proof without Heavy Computation for the Group Law on Elliptic Curves.
CoRR
Koji Nuida
2020 — conf
Communication-Efficient (Client-Aided) Secure Two-Party Protocols and Its Application.
Financial Cryptography
Satsuya Ohata, Koji Nuida
2020 J jnl
Constant-Round Client-Aided Two-Server Secure Comparison Protocol and Its Applications.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Hiraku Morita, Nuttapong Attrapadung, Tadanori Teruya, Satsuya Ohata, Koji Nuida, Goichiro Hanaoka
2020 Misc conf
Efficiency and Accuracy Improvements of Secure Floating-Point Addition over Secret Sharing.
IWSEC
Kota Sasaki, Koji Nuida
2020 B conf
Identity-Based Outsider Anonymous Broadcast Encryption with Simultaneous Individual Messaging.
NSS
Mriganka Mandal, Koji Nuida
2020 C conf
Short Lattice Signatures in the Standard Model with Efficient Tag Generation.
ProvSec
Kaisei Kajita, Kazuto Ogawa, Koji Nuida, Tsuyoshi Takagi
2019 J jnl
A Single Shuffle Is Enough for Secure Card-Based Computation of Any Circuit.
IACR Cryptol. ePrint Arch.
Kazumasa Shinagawa, Koji Nuida
2019 J jnl
An Efficient Private Evaluation of a Decision Graph.
IACR Cryptol. ePrint Arch.
Hiroki Sudo, Koji Nuida, Kana Shimizu
2019 J jnl
Arbitrary Univariate Function Evaluation and Re-Encryption Protocols over Lifted-ElGamal Type Ciphertexts.
IACR Cryptol. ePrint Arch.
Koji Nuida, Satsuya Ohata, Shigeo Mitsunari, Nuttapong Attrapadung
2019 J jnl
Elliptic Curve Method Using Complex Multiplication Method.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Yusuke Aikawa, Koji Nuida, Masaaki Shirase
2019 J jnl
Polynomial expressions of p-ary auction functions.
J. Math. Cryptol.
Shizuo Kaji, Toshiaki Maeno, Koji Nuida, Yasuhide Numata
2019 — conf
Privacy Preservation for Versatile Pay-TV Services.
HCI (29)
Kazuto Ogawa, Koji Nuida
2019 J jnl
Secure Wavelet Matrix: Alphabet-Friendly Privacy-Preserving String Search for Bioinformatics.
IEEE ACM Trans. Comput. Biol. Bioinform.
Hiroki Sudo, Masanobu Jimbo, Koji Nuida, Kana Shimizu
2019 J jnl
Towards High-Throughput Secure MPC over the Internet: Communication-Efficient Two-Party Protocols and Its Application.
CoRR
Satsuya Ohata, Koji Nuida
2018 Misc conf
An Efficient Private Evaluation of a Decision Graph.
ICISC
Hiroki Sudo, Koji Nuida, Kana Shimizu
2018 J jnl
Chosen ciphertext secure keyed-homomorphic public-key cryptosystems.
Des. Codes Cryptogr.
Keita Emura, Goichiro Hanaoka, Koji Nuida, Go Ohtake, Takahiro Matsuda, Shota Yamada
2018 — conf
Constant-Round Client-Aided Secure Comparison Protocol.
ESORICS (2)
Hiraku Morita, Nuttapong Attrapadung, Tadanori Teruya, Satsuya Ohata, Koji Nuida, Goichiro Hanaoka
2018 J jnl
Keeping or Losing Tiny-Error Correctness of Cryptosystems Implemented by Secure Pseudorandom Generators.
IACR Cryptol. ePrint Arch.
Koji Nuida
2018 C conf
Secure Division Protocol and Applications to Privacy-preserving Chi-squared Tests.
ISITA
Hiraku Morita, Nuttapong Attrapadung, Satsuya Ohata, Koji Nuida, Shota Yamada, Kana Shimizu, Goichiro Hanaoka, Kiyoshi Asai
2018 J jnl
Secure Grouping Protocol Using a Deck of Cards.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Yuji Hashimoto, Kazumasa Shinagawa, Koji Nuida, Masaki Inamura, Goichiro Hanaoka
2018 J jnl
Toward Finite-Runtime Card-Based Protocol for Generating a Hidden Random Permutation without Fixed Points.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Yuji Hashimoto, Koji Nuida, Kazumasa Shinagawa, Masaki Inamura, Goichiro Hanaoka
2018 C conf
Tree-based Secure Comparison of Secret Shared Data.
ISITA
Hiraku Morita, Nuttapong Attrapadung, Satsuya Ohata, Shota Yamada, Koji Nuida, Goichiro Hanaoka
2017 Misc conf
A Public-Key Encryption Scheme Based on Non-linear Indeterminate Equations.
SAC
Koichiro Akiyama, Yasuhiro Goto, Shinya Okumura, Tsuyoshi Takagi, Koji Nuida, Goichiro Hanaoka
2017 J jnl
A Public-key Encryption Scheme Based on Non-linear Indeterminate Equations (Giophantus).
IACR Cryptol. ePrint Arch.
Koichiro Akiyama, Yasuhiro Goto, Shinya Okumura, Tsuyoshi Takagi, Koji Nuida, Goichiro Hanaoka, Hideo Shimizu, Yasuhiko Ikematsu
2017 J jnl
Card-Based Protocols Using Regular Polygon Cards.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Kazumasa Shinagawa, Takaaki Mizuki, Jacob C. N. Schuldt, Koji Nuida, Naoki Kanayama, Takashi Nishide, Goichiro Hanaoka, Eiji Okamoto
2017 Misc conf
Correction of a Secure Comparison Protocol for Encrypted Integers in IEEE WIFS 2012 (Short Paper).
IWSEC
Baptiste Vinh Mau, Koji Nuida
2017 — conf
Secure Grouping Protocol Using a Deck of Cards.
ICITS
Yuji Hashimoto, Kazumasa Shinagawa, Koji Nuida, Masaki Inamura, Goichiro Hanaoka
2017 J jnl
Secure Grouping Protocol Using a Deck of Cards.
CoRR
Yuji Hashimoto, Kazumasa Shinagawa, Koji Nuida, Masaki Inamura, Goichiro Hanaoka
2016 C conf
Committed AND protocol using three cards with more handy shuffle.
ISITA
Kazumasa Shinagawa, Koji Nuida, Takashi Nishide, Goichiro Hanaoka, Eiji Okamoto
2016 J jnl
Efficient privacy-preserving string search and an application in genomics.
Bioinform.
Kana Shimizu, Koji Nuida, Gunnar Rätsch
2016 J jnl
Intrinsic reflections in Coxeter systems.
J. Comb. Theory A
Bernhard Mühlherr, Koji Nuida
2016 J jnl
Secure Computation Protocols Using Polarizing Cards.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Kazumasa Shinagawa, Takaaki Mizuki, Jacob C. N. Schuldt, Koji Nuida, Naoki Kanayama, Takashi Nishide, Goichiro Hanaoka, Eiji Okamoto
2016 — conf
Size-Hiding Computation for Multiple Parties.
ASIACRYPT (2)
Kazumasa Shinagawa, Koji Nuida, Takashi Nishide, Goichiro Hanaoka, Eiji Okamoto
2015 — conf
(Batch) Fully Homomorphic Encryption over Integers for Non-Binary Message Spaces.
EUROCRYPT (1)
Koji Nuida, Kaoru Kurosawa
2015 J jnl
A Mathematical Problem for Security Analysis of Hash Functions and Pseudorandom Generators.
Int. J. Found. Comput. Sci.
Koji Nuida, Takuro Abe, Shizuo Kaji, Toshiaki Maeno, Yasuhide Numata
2015 B conf
A Simple and Improved Algorithm for Integer Factorization with Implicit Hints.
CT-RSA
Koji Nuida, Naoto Itakura, Kaoru Kurosawa
2015 C conf
Multi-party Computation with Small Shuffle Complexity Using Regular Polygon Cards.
ProvSec
Kazumasa Shinagawa, Takaaki Mizuki, Jacob C. N. Schuldt, Koji Nuida, Naoki Kanayama, Takashi Nishide, Goichiro Hanaoka, Eiji Okamoto
2015 Misc conf
On Limitations and Alternatives of Privacy-Preserving Cryptographic Protocols for Genomic Data.
IWSEC
Tadanori Teruya, Koji Nuida, Kana Shimizu, Goichiro Hanaoka
2015 J jnl
Polynomial Expressions of Carries in p-ary Arithmetics.
CoRR
Shizuo Kaji, Toshiaki Maeno, Koji Nuida, Yasuhide Numata
2015 J jnl
Privacy-preserving search for chemical compound databases.
BMC Bioinform.
Kana Shimizu, Koji Nuida, Hiromi Arai, Shigeo Mitsunari, Nuttapong Attrapadung, Michiaki Hamada, Koji Tsuda, Takatsugu Hirokawa, Jun Sakuma, Goichiro Hanaoka, Kiyoshi Asai
2015 Misc conf
Secure Multi-Party Computation Using Polarizing Cards.
IWSEC
Kazumasa Shinagawa, Takaaki Mizuki, Jacob C. N. Schuldt, Koji Nuida, Naoki Kanayama, Takashi Nishide, Goichiro Hanaoka, Eiji Okamoto
2014 J jnl
(Batch) Fully Homomorphic Encryption over Integers for Non-Binary Message Spaces.
IACR Cryptol. ePrint Arch.
Koji Nuida, Kaoru Kurosawa
2014 J jnl
A Simple Framework for Noise-Free Construction of Fully Homomorphic Encryption from a Special Class of Non-Commutative Groups.
IACR Cryptol. ePrint Arch.
Koji Nuida
2014 J jnl
A Simple and Improved Algorithm for Integer Factorization with Implicit Hints.
IACR Cryptol. ePrint Arch.
Koji Nuida, Naoto Itakura, Kaoru Kurosawa
2014 Misc conf
Chosen Ciphertext Security on Hard Membership Decision Groups: The Case of Semi-smooth Subgroups of Quadratic Residues.
SCN
Takashi Yamakawa, Shota Yamada, Koji Nuida, Goichiro Hanaoka, Noboru Kunihiro
2014 C conf
How to Use Pseudorandom Generators in Unconditional Security Settings.
ProvSec
Koji Nuida
2014 J jnl
Tree-Structured Composition of Homomorphic Encryption: How to Weaken Underlying Assumptions.
IACR Cryptol. ePrint Arch.
Koji Nuida, Goichiro Hanaoka, Takahiro Matsuda
2013 J jnl
Chosen Ciphertext Secure Keyed-Homomorphic Public-Key Encryption.
IACR Cryptol. ePrint Arch.
Keita Emura, Goichiro Hanaoka, Koji Nuida, Go Ohtake, Takahiro Matsuda, Shota Yamada
2013 J jnl
On the Security of Pseudorandomized Information-Theoretically Secure Schemes.
IEEE Trans. Inf. Theory
Koji Nuida, Goichiro Hanaoka
2012 J jnl
A mathematical problem for security analysis of hash functions and pseudorandom generators
CoRR
Koji Nuida, Takuro Abe, Shizuo Kaji, Toshiaki Maeno, Yasuhide Numata
2012 J jnl
A mathematical problem for security analysis of hash functions and pseudorandom generators.
IACR Cryptol. ePrint Arch.
Koji Nuida, Takuro Abe, Shizuo Kaji, Toshiaki Maeno, Yasuhide Numata
2012 J jnl
On pseudorandomization of information-theoretically secure schemes without hardness assumptions.
IACR Cryptol. ePrint Arch.
Koji Nuida
2012 J jnl
Short collusion-secure fingerprint codes against three pirates.
Int. J. Inf. Sec.
Koji Nuida
2011 Misc conf
A Mathematical Problem for Security Analysis of Hash Functions and Pseudorandom Generators.
IWSEC
Koji Nuida, Takuro Abe, Shizuo Kaji, Toshiaki Maeno, Yasuhide Numata
2010 J jnl
A characterization of signed graphs with generalized perfect elimination orderings.
Discret. Math.
Koji Nuida
2010 J jnl
On the Security of Pseudorandomized Information-Theoretically Secure Schemes.
IACR Cryptol. ePrint Arch.
Koji Nuida, Goichiro Hanaoka
2010 J jnl
Pattern Occurrence in the Dyadic Expansion of Square Root of Two and an Analysis of Pseudorandom Number Generators.
Integers
Koji Nuida
2010 — conf
Short Collusion-Secure Fingerprint Codes against Three Pirates.
Information Hiding
Koji Nuida
2010 J jnl
Short collusion-secure fingerprint codes against three pirates
CoRR
Koji Nuida
2010 J jnl
Short collusion-secure fingerprint codes against three pirates.
IACR Cryptol. ePrint Arch.
Koji Nuida
2009 — conf
A General Conversion Method of Fingerprint Codes to (More) Robust Fingerprint Codes against Bit Erasure.
ICITS
Koji Nuida
2009 J jnl
An Efficient 2-Secure and Short Random Fingerprint Code and Its Security Evaluation.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Koji Nuida, Satoshi Fujitsu, Manabu Hagiwara, Hideki Imai, Takashi Kitagawa, Kazuto Ogawa, Hajime Watanabe
2009 Misc conf
An Error-Tolerant Variant of a Short 2-Secure Fingerprint Code and Its Security Evaluation.
IWSEC
Koji Nuida
2009 — conf
An Improvement of Pseudorandomization against Unbounded Attack Algorithms - The Case of Fingerprint Codes.
ICITS
Koji Nuida, Goichiro Hanaoka
2009 — conf
An Improvement of Short 2-Secure Fingerprint Codes Strongly Avoiding False-Positive.
Information Hiding
Koji Nuida
2009 J jnl
An improvement of discrete Tardos fingerprinting codes.
Des. Codes Cryptogr.
Koji Nuida, Satoshi Fujitsu, Manabu Hagiwara, Takashi Kitagawa, Hajime Watanabe, Kazuto Ogawa, Hideki Imai
2009 J jnl
Making Collusion-Secure Codes (More) Robust against Bit Erasure.
IACR Cryptol. ePrint Arch.
Koji Nuida
2009 — conf
On the Security of Pseudorandomized Information-Theoretically Secure Schemes.
ICITS
Koji Nuida, Goichiro Hanaoka
2009 J jnl
Pattern occurrence in the dyadic expansion of square root of two and an analysis of pseudorandom number generators
CoRR
Koji Nuida
2008 J jnl
An improvement of discrete Tardos fingerprinting codes.
IACR Cryptol. ePrint Arch.
Koji Nuida, Satoshi Fujitsu, Manabu Hagiwara, Takashi Kitagawa, Hajime Watanabe, Kazuto Ogawa, Hideki Imai
2007 — conf
A Tracing Algorithm for Short 2-Secure Probabilistic Fingerprinting Codes Strongly Protecting Innocent Users.
CCNC
Satoshi Fujitsu, Koji Nuida, Manabu Hagiwara, Takashi Kitagawa, Hajime Watanabe, Kazuto Ogawa, Hideki Imai
2007 — conf
An Improvement of Tardos's Collusion-Secure Fingerprinting Codes with Very Short Lengths.
AAECC
Koji Nuida, Satoshi Fujitsu, Manabu Hagiwara, Takashi Kitagawa, Hajime Watanabe, Kazuto Ogawa, Hideki Imai
2007 — conf
Optimization of Tardos's Fingerprinting Codes in a Viewpoint of Memory Amount.
Information Hiding
Koji Nuida, Manabu Hagiwara, Hajime Watanabe, Hideki Imai
2006 J jnl
Optimal probabilistic fingerprinting codes using optimal finite random variables related to numerical quadrature
CoRR
Koji Nuida, Manabu Hagiwara, Hajime Watanabe, Hideki Imai