Keita Emura

202 papers A 5B 13C 18Misc 12Journal 113Unranked 34
YearRankTypeTitle / Venue / Authors
2026 J jnl
On the traceability of group signatures: Uncorrupted user must exist.
Theor. Comput. Sci.
Keita Emura
2026 J jnl
Security analysis on a public-key inverted-index keyword search scheme with designated tester.
J. Inf. Secur. Appl.
Mizuki Hayashi, Keita Emura
2025 — conf
A Smart Contract-Based Non-Transferable Signature Verification System using Nominative Signatures.
AsiaJCIS
Hinata Nishino, Kazumasa Omote, Keita Emura
2025 J jnl
A Smart Contract-based Non-Transferable Signature Verification System using Nominative Signatures.
CoRR
Hinata Nishino, Kazumasa Omote, Keita Emura
2025 J jnl
An anonymous yet accountable contract wallet system using account abstraction.
J. Inf. Secur. Appl.
Kota Chin, Keita Emura, Kazumasa Omote
2025 J jnl
Comments on "Blockchain-Assisted Public-Key Encryption With Keyword Search Against Keyword Guessing Attacks for Cloud Storage".
IEEE Trans. Cloud Comput.
Keita Emura
2025 J jnl
Generic Construction of Dual-Server Public Key Authenticated Encryption With Keyword Search.
IET Inf. Secur.
Keita Emura
2025 J jnl
Generic Construction of Forward Secure Public Key Authenticated Encryption with Keyword Search.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Keita Emura
2025 B conf
Group Signatures with Message-Dependent Opening Directly Imply Timed-Release Encryption.
CANS
Yuto Imura, Keita Emura
2025 J jnl
Group Signatures with Message-Dependent Opening Directly Imply Timed-Release Encryption.
IACR Cryptol. ePrint Arch.
Yuto Imura, Keita Emura
2025 J jnl
Implementation and Evaluation of an Identity-based Encryption with Security Against the KGC.
J. Inf. Process.
Shuntaro Ema, Yuta Sato, Hinata Nishino, Keita Emura, Toshihiro Ohigashi
2025 Misc ed.
Information Security Applications - 25th International Conference, WISA 2024, Jeju Island, South Korea, August 21-23, 2024, Revised Selected Papers
WISA
Jong-Hyouk Lee, Keita Emura, Sokjoon Lee
2025 J jnl
Key-Insulated and Privacy-Preserving Signature Scheme with Publicly Derived Public Key, Revisited: Consistency, Outsider Strong Unforgeability, and Generic Construction.
IACR Commun. Cryptol.
Keita Emura
2025 J jnl
Malleability-Resistant Encrypted Control System with Disturbance Compensation and Real-Time Attack Detection.
CoRR
Naoki Aizawa, Keita Emura, Kiminao Kogiso
2025 J jnl
On the Consideration of Vanity Address Generation via Identity-Based Signatures.
CoRR
Shogo Murasaki, Kazumasa Omote, Keita Emura
2025 J jnl
On the Feasibility of Identity-Based Encryption with Equality Test against Insider Attacks from Weaker Assumptions.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Keita Emura
2025 B conf
On the Relations Between Matchmaking Public Key Encryption and Public Key Authenticated Encryption with Keyword Search.
CANS
Takeshi Yoshida, Keita Emura
2025 J jnl
On the Relations between Matchmaking Public Key Encryption and Public Key Authenticated Encryption with Keyword Search.
IACR Cryptol. ePrint Arch.
Takeshi Yoshida, Keita Emura
2025 — ed.
Proceedings of the 12th ACM ASIA Public-Key Cryptography Workshop, APKC 2025, Meliá Hanoi, Hanoi, Vietnam, August 25-29, 2025
APKC@AsiaCCS
Hiraku Morita, Keita Emura
2025 J jnl
Re-randomization Attack on the Certificateless Encryption Scheme proposed by Guo et al.
IACR Cryptol. ePrint Arch.
Nobuyuki Sugio, Keita Emura, Toshihiro Ohigashi
2025 — conf
Security Analysis on a Public-Key Inverted-Index Keyword Search Scheme with Designated Tester.
AsiaJCIS
Mizuki Hayashi, Keita Emura
2025 J jnl
Security Analysis on a Public-Key Inverted-Index Keyword Search Scheme with Designated Tester.
IACR Cryptol. ePrint Arch.
Mizuki Hayashi, Keita Emura
2024 J jnl
A Sealed-Bid Auction with Fund Binding: Preventing Maximum Bidding Price Leakage.
IEICE Trans. Inf. Syst.
Kota Chin, Keita Emura, Shingo Sato, Kazumasa Omote
2024 — conf
An Identity Management System Using Group Signatures with Message-Dependent Opening.
AsiaJCIS
Yuto Imura, Keita Emura
2024 — conf
Attribute-Based Keyed Fully Homomorphic Encryption.
SCN (2)
Keita Emura, Shingo Sato, Atsushi Takayasu
2024 J jnl
Attribute-based Keyed (Fully) Homomorphic Encryption.
IACR Cryptol. ePrint Arch.
Keita Emura, Shingo Sato, Atsushi Takayasu
2024 — conf
Generic Construction of Forward Secure Public Key Authenticated Encryption with Keyword Search.
ACNS (1)
Keita Emura
2024 J jnl
Generic Construction of Public-Key Authenticated Encryption with Keyword Search Revisited.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Keita Emura
2024 J jnl
Key-Insulated and Privacy-Preserving Signature Scheme with Publicly Derived Public Key, Revisited: Consistency, Outsider Strong Unforgeability, and Generic Construction.
IACR Cryptol. ePrint Arch.
Keita Emura
2024 J jnl
More Efficient Adaptively Secure Lattice-Based IBE with Equality Test in the Standard Model.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Kyoichi Asano, Keita Emura, Atsushi Takayasu
2024 J jnl
On the BUFF Security of ECDSA with Key Recovery.
IACR Cryptol. ePrint Arch.
Keita Emura
2024 — conf
On the Feasibility of Identity-Based Encryption with Equality Test Against Insider Attacks.
ACISP (1)
Keita Emura
2024 J jnl
On the Traceability of Group Signatures: Uncorrupted User Must Exist.
IACR Cryptol. ePrint Arch.
Keita Emura
2024 J jnl
Outsider-Anonymous Broadcast Encryption with Keyword Search: Generic Construction, CCA Security, and with Sublinear Ciphertexts.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Keita Emura, Kaisei Kajita, Go Ohtake
2023 J jnl
A Deeper Look into Deep Learning-based Output Prediction Attacks Using Weak SPN Block Ciphers.
J. Inf. Process.
Hayato Kimura, Keita Emura, Takanori Isobe, Ryoma Ito, Kazuto Ogawa, Toshihiro Ohigashi
2023 J jnl
A Generic Construction of CCA-Secure Identity-Based Encryption with Equality Test against Insider Attacks.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Keita Emura, Atsushi Takayasu
2023 J jnl
An Anonymous yet Accountable Contract Wallet System using Account Abstraction.
CoRR
Kota Chin, Keita Emura, Kazumasa Omote
2023 J jnl
An End-To-End Encrypted Cache System with Time-Dependent Access Control.
CoRR
Keita Emura, Masato Yoshimi
2023 C conf
An End-to-End Encrypted Cache System with Time-Dependent Access Control.
ICISSP
Keita Emura, Masato Yoshimi
2023 J jnl
Can Sleep Apnea Be Detected from Human Pulse Waveform with Laplace Noise?
J. Adv. Comput. Intell. Intell. Informatics
Itaru Kaneko, Le Trieu Phong, Keita Emura, Emi Yuda
2023 — conf
Continuous Group Key Agreement with Flexible Authorization and Its Applications.
IWSPA@CODASPY
Kaisei Kajita, Keita Emura, Kazuto Ogawa, Ryo Nojima, Go Ohtake
2023 J jnl
Cybersecurity-Enhanced Encrypted Control System Using Keyed-Homomorphic Public Key Encryption.
IEEE Access
Masaki Miyamoto, Kaoru Teranishi, Keita Emura, Kiminao Kogiso
2023 J jnl
Generic Construction of Broadcast Authenticated Encryption with Keyword Search.
IACR Cryptol. ePrint Arch.
Keita Emura
2023 J jnl
Generic Construction of Dual-Server Public Key Authenticated Encryption with Keyword Search.
IACR Cryptol. ePrint Arch.
Keita Emura
2023 J jnl
Generic Construction of Forward Secure Public Key Authenticated Encryption with Keyword Search.
IACR Cryptol. ePrint Arch.
Keita Emura
2023 J jnl
Generic Construction of Fully Anonymous Broadcast Authenticated Encryption with Keyword Search with Adaptive Corruptions.
IET Inf. Secur.
Keita Emura
2023 J jnl
On the Feasibility of Identity-based Encryption with Equality Test against Insider Attacks.
IACR Cryptol. ePrint Arch.
Keita Emura
2023 J jnl
Outsider-Anonymous Broadcast Encryption with Keyword Search: Generic Construction, CCA Security, and with Sublinear Ciphertexts.
IACR Cryptol. ePrint Arch.
Keita Emura, Kaisei Kajita, Go Ohtake
2022 C conf
A Generic Construction of CCA-Secure Attribute-Based Encryption with Equality Test.
ProvSec
Kyoichi Asano, Keita Emura, Atsushi Takayasu, Yohei Watanabe
2022 — conf
A Sealed-bid Auction with Fund Binding: Preventing Maximum Bidding Price Leakage.
Blockchain
Kota Chin, Keita Emura, Kazumasa Omote, Shingo Sato
2022 J jnl
A Sealed-bid Auction with Fund Binding: Preventing Maximum Bidding Price Leakage.
CoRR
Kota Chin, Keita Emura, Kazumasa Omote, Shingo Sato
2022 J jnl
Cache-22: A Highly Deployable End-To-End Encrypted Cache System with Post-Quantum Security.
IACR Cryptol. ePrint Arch.
Keita Emura, Shiho Moriai, Takuma Nakajima, Masato Yoshimi
2022 J jnl
Continuous Group Key Agreement with Flexible Authorization and Its Applications.
IACR Cryptol. ePrint Arch.
Kaisei Kajita, Keita Emura, Kazuto Ogawa, Ryo Nojima, Go Ohtake
2022 — conf
Generic Construction of Public-key Authenticated Encryption with Keyword Search Revisited: Stronger Security and Efficient Construction.
APKC@AsiaCCS
Keita Emura
2022 J jnl
Generic Construction of Public-key Authenticated Encryption with Keyword Search Revisited: Stronger Security and Efficient Construction.
IACR Cryptol. ePrint Arch.
Keita Emura
2022 J jnl
Identity-based encryption with security against the KGC: A formal model and its instantiations.
Theor. Comput. Sci.
Keita Emura, Shuichi Katsumata, Yohei Watanabe
2022 B conf
Keyed-Fully Homomorphic Encryption Without Indistinguishability Obfuscation.
ACNS
Shingo Sato, Keita Emura, Atsushi Takayasu
2022 J jnl
Keyed-Fully Homomorphic Encryption without Indistinguishability Obfuscation.
IACR Cryptol. ePrint Arch.
Shingo Sato, Keita Emura, Atsushi Takayasu
2022 Misc conf
Membership Privacy for Asynchronous Group Messaging.
WISA
Keita Emura, Kaisei Kajita, Ryo Nojima, Kazuto Ogawa, Go Ohtake
2022 J jnl
Membership Privacy for Asynchronous Group Messaging.
IACR Cryptol. ePrint Arch.
Keita Emura, Kaisei Kajita, Ryo Nojima, Kazuto Ogawa, Go Ohtake
2022 C conf
More Efficient Adaptively Secure Lattice-Based IBE with Equality Test in the Standard Model.
ISC
Kyoichi Asano, Keita Emura, Atsushi Takayasu
2022 J jnl
More Efficient Adaptively Secure Lattice-based IBE with Equality Test in the Standard Model.
IACR Cryptol. ePrint Arch.
Kyoichi Asano, Keita Emura, Atsushi Takayasu
2022 — conf
Output Prediction Attacks on Block Ciphers Using Deep Learning.
ACNS Workshops
Hayato Kimura, Keita Emura, Takanori Isobe, Ryoma Ito, Kazuto Ogawa, Toshihiro Ohigashi
2022 J jnl
Privacy-Preserving Federated Learning for Detecting Fraudulent Financial Transactions in Japanese Banks.
J. Inf. Process.
Sachiko Kanamori, Taeko Abe, Takuma Ito, Keita Emura, Lihua Wang, Shuntaro Yamamoto, Le Trieu Phong, Kaien Abe, Sangwook Kim, Ryo Nojima, Seiichi Ozawa, Shiho Moriai
2022 J jnl
Providing Membership Privacy to the Asynchronous Ratcheting Trees Protocol without losing Scalability.
J. Wirel. Mob. Networks Ubiquitous Comput. Dependable Appl.
Keita Emura, Kaisei Kajita, Ryo Nojima, Kazuto Ogawa, Go Ohtake
2022 — conf
State-free End-to-End Encrypted Storage and Chat Systems based on Searchable Encryption.
ICEIS (2)
Keita Emura, Ryoma Ito, Sachiko Kanamori, Ryo Nojima, Yohei Watanabe
2021 J jnl
A Generic Construction of CCA-secure Attribute-based Encryption with Equality Test.
IACR Cryptol. ePrint Arch.
Kyoichi Asano, Keita Emura, Atsushi Takayasu, Yohei Watanabe
2021 — conf
A Privacy-Preserving Enforced Bill Collection System using Smart Contracts.
AsiaJCIS
Tomoki Fujitani, Keita Emura, Kazumasa Omote
2021 J jnl
Adaptively secure revocable hierarchical IBE from k-linear assumption.
Des. Codes Cryptogr.
Keita Emura, Atsushi Takayasu, Yohei Watanabe
2021 — conf
An Anonymous Trust-Marking Scheme on Blockchain Systems.
IEEE ICBC
Teppei Sato, Keita Emura, Tomoki Fujitani, Kazumasa Omote
2021 J jnl
An Anonymous Trust-Marking Scheme on Blockchain Systems.
IEEE Access
Teppei Sato, Keita Emura, Tomoki Fujitani, Kazumasa Omote
2021 J jnl
Efficient identity-based encryption with Hierarchical key-insulation from HIBE.
Des. Codes Cryptogr.
Keita Emura, Atsushi Takayasu, Yohei Watanabe
2021 J jnl
Efficient revocable identity-based encryption with short public parameters.
Theor. Comput. Sci.
Keita Emura, Jae Hong Seo, Yohei Watanabe
2021 J jnl
Fully Anonymous Group Signature with Verifier-Local Revocation.
IACR Cryptol. ePrint Arch.
Ai Kitagawa, Yusuke Sakai, Keita Emura, Goichiro Hanaoka, Keisuke Tanaka
2021 J jnl
Generic Constructions of Revocable Hierarchical Identity-based Encryption.
IACR Cryptol. ePrint Arch.
Keita Emura, Atsushi Takayasu, Yohei Watanabe
2021 — conf
Implementation and Evaluation of an Identity-Based Encryption with Security Against the KGC.
CANDAR (Workshops)
Shuntaro Ema, Yuta Sato, Keita Emura, Toshihiro Ohigashi
2021 J jnl
On the Security of Keyed-Homomorphic PKE: Preventing Key Recovery Attacks and Ciphertext Validity Attacks.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Keita Emura
2021 J jnl
Output Prediction Attacks on SPN Block Ciphers using Deep Learning.
IACR Cryptol. ePrint Arch.
Hayato Kimura, Keita Emura, Takanori Isobe, Ryoma Ito, Kazuto Ogawa, Toshihiro Ohigashi
2021 J jnl
Privacy-Preserving Data Analysis: Providing Traceability without Big Brother.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Hiromi Arai, Keita Emura, Takuya Hayashi
2021 — ed.
Proceedings of the 8th on ASIA Public-Key Cryptography Workshop, APKC@AsiaCCS 2021, Virtual Event Hong Kong, 7 June, 2021
APKC@AsiaCCS
Keita Emura, Yuntao Wang
2021 J jnl
State-free End-to-End Encrypted Storage and Chat Systems based on Searchable Encryption.
IACR Cryptol. ePrint Arch.
Keita Emura, Ryoma Ito, Sachiko Kanamori, Ryo Nojima, Yohei Watanabe
2021 C conf
Verifiable Functional Encryption Using Intel SGX.
ProvSec
Tatsuya Suzuki, Keita Emura, Toshihiro Ohigashi, Kazumasa Omote
2020 J jnl
A Revocable Group Signature Scheme with Scalability from Simple Assumptions.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Keita Emura, Takuya Hayashi
2020 J jnl
Adaptively Secure Revocable Hierarchical IBE from k-linear Assumption.
IACR Cryptol. ePrint Arch.
Keita Emura, Atsushi Takayasu, Yohei Watanabe
2020 J jnl
An Anonymous Trust-Marking Scheme on Blockchain Systems.
CoRR
Teppei Sato, Keita Emura, Tomoki Fujitani, Kazumasa Omote
2020 C conf
Cache-22: A Highly Deployable Encrypted Cache System.
ISITA
Keita Emura, Shiho Moriai, Takuma Nakajima, Masato Yoshimi
2020 J jnl
Efficient Identity-Based Encryption with Hierarchical Key-Insulation from HIBE.
IACR Cryptol. ePrint Arch.
Keita Emura, Atsushi Takayasu, Yohei Watanabe
2020 J jnl
Group Signatures with Time-Bound Keys Revisited: A New Model, an Efficient Construction, and its Implementation.
IEEE Trans. Dependable Secur. Comput.
Keita Emura, Takuya Hayashi, Ai Ishida
2020 J jnl
Implementation of a Strongly Robust Identity-Based Encryption Scheme over Type-3 Pairings.
Int. J. Netw. Comput.
Hiroshi Okano, Keita Emura, Takuya Ishibashi, Toshihiro Ohigashi, Tatsuya Suzuki
2020 — ed.
Proceedings of the 7th on ASIA Public-Key Cryptography Workshop, APKC@AsiaCCS 2020, Taipei, Taiwan, October 6, 2020
APKC@AsiaCCS
Keita Emura, Naoto Yanai
2020 J jnl
Secure-channel free searchable encryption with multiple keywords: A generic construction, an instantiation, and its implementation.
J. Comput. Syst. Sci.
Keita Emura, Katsuhiko Ito, Toshihiro Ohigashi
2020 J jnl
Verifiable Functional Encryption using Intel SGX.
IACR Cryptol. ePrint Arch.
Tatsuya Suzuki, Keita Emura, Toshihiro Ohigashi, Kazumasa Omote
2019 J jnl
A Generic Construction of Integrated Secure-Channel Free PEKS and PKE and its Application to EMRs in Cloud Storage.
J. Medical Syst.
Tatsuya Suzuki, Keita Emura, Toshihiro Ohigashi
2019 J jnl
A Revocable Group Signature Scheme with Scalability from Simple Assumptions and Its Application to Identity Management.
IACR Cryptol. ePrint Arch.
Keita Emura, Takuya Hayashi
2019 J jnl
Group Signatures with Message-Dependent Opening: Formal Definitions and Constructions.
Secur. Commun. Networks
Keita Emura, Goichiro Hanaoka, Yutaka Kawai, Takahiro Matsuda, Kazuma Ohara, Kazumasa Omote, Yusuke Sakai
2019 — conf
Identity-Based Encryption with Security Against the KGC: A Formal Model and Its Instantiation from Lattices.
ESORICS (2)
Keita Emura, Shuichi Katsumata, Yohei Watanabe
2019 J jnl
Identity-Based Encryption with Security against the KGC: A Formal Model and Its Instantiations.
IACR Cryptol. ePrint Arch.
Keita Emura, Shuichi Katsumata, Yohei Watanabe
2019 — conf
Implementation of a Strongly Robust Identity-Based Encryption Scheme over Type-3 Pairings.
CANDAR
Hiroshi Okano, Keita Emura, Takuya Ishibashi, Toshihiro Ohigashi, Tatsuya Suzuki
2019 J jnl
Implementation of a Strongly Robust Identity-Based Encryption Scheme over Type-3 Pairings.
IACR Cryptol. ePrint Arch.
Hiroshi Okano, Keita Emura, Takuya Ishibashi, Toshihiro Ohigashi, Tatsuya Suzuki
2019 J jnl
Privacy-Preserving Aggregation of Time-Series Data with Public Verifiability from Simple Assumptions and Its Implementations.
Comput. J.
Keita Emura, Hayato Kimura, Toshihiro Ohigashi, Tatsuya Suzuki
2019 — ed.
Proceedings of the 6th on ASIA Public-Key Cryptography Workshop, APKC@AsiaCCS 2019, Auckland, New Zealand, July 8, 2019
APKC@AsiaCCS
Keita Emura, Takaaki Mizuki
2019 A conf
Proper Usage of the Group Signature Scheme in ISO/IEC 20008-2.
AsiaCCS
Ai Ishida, Yusuke Sakai, Keita Emura, Goichiro Hanaoka, Keisuke Tanaka
2019 J jnl
Proper Usage of the Group Signature Scheme in ISO/IEC 20008-2.
IACR Cryptol. ePrint Arch.
Ai Ishida, Yusuke Sakai, Keita Emura, Goichiro Hanaoka, Keisuke Tanaka
2019 — conf
Session details: Invited Talk.
APKC@AsiaCCS
Keita Emura
2019 J jnl
Shortening the Libert-Peters-Yung Revocable Group Signature Scheme by Using the Random Oracle Methodology.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Kazuma Ohara, Keita Emura, Goichiro Hanaoka, Ai Ishida, Kazuo Ohta, Yusuke Sakai
2018 C conf
A Generic Construction of Integrated Secure-Channel Free PEKS and PKE.
ISPEC
Tatsuya Suzuki, Keita Emura, Toshihiro Ohigashi
2018 C conf
A Revocable Group Signature Scheme with Scalability from Simple Assumptions and Its Implementation.
ISC
Keita Emura, Takuya Hayashi
2018 J jnl
Accumulable optimistic fair exchange from verifiably encrypted homomorphic signatures.
Int. J. Inf. Sec.
Jae Hong Seo, Keita Emura, Keita Xagawa, Kazuki Yoneyama
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 Misc conf
Fully Anonymous Group Signature with Verifier-Local Revocation.
SCN
Ai Ishida, Yusuke Sakai, Keita Emura, Goichiro Hanaoka, Keisuke Tanaka
2018 J jnl
Generic Constructions for Fully Secure Revocable Attribute-Based Encryption.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Kotoko Yamada, Nuttapong Attrapadung, Keita Emura, Goichiro Hanaoka, Keisuke Tanaka
2018 — ed.
Proceedings of the 5th ACM on ASIA Public-Key Cryptography Workshop, APKC@AsiaCCS, Incheon, Republic of Korea, June 4, 2018
APKC@AsiaCCS
Keita Emura, Jae Hong Seo, Yohei Watanabe
2018 J jnl
Road-to-Vehicle Communications With Time-Dependent Anonymity: A Lightweight Construction and Its Experimental Results.
IEEE Trans. Veh. Technol.
Keita Emura, Takuya Hayashi
2017 — conf
A Framework of Privacy Preserving Anomaly Detection: Providing Traceability without Big Brother.
WPES@CCS
Hiromi Arai, Keita Emura, Takuya Hayashi
2017 B conf
A Generic Construction of Secure-Channel Free Searchable Encryption with Multiple Keywords.
NSS
Keita Emura
2017 J jnl
A privacy-enhanced access log management mechanism in SSO systems from nominative signatures.
Int. J. Appl. Cryptogr.
Sanami Nakagawa, Takashi Nishide, Eiji Okamoto, Keita Emura, Goichiro Hanaoka, Yusuke Sakai, Akihisa Kodate
2017 J jnl
Establishing secure and anonymous communication channel: KEM/DEM-based construction and its implementation.
J. Inf. Secur. Appl.
Keita Emura, Akira Kanaoka, Satoshi Ohta, Takeshi Takahashi
2017 — conf
Generic Constructions for Fully Secure Revocable Attribute-Based Encryption.
ESORICS (2)
Kotoko Yamada, Nuttapong Attrapadung, Keita Emura, Goichiro Hanaoka, Keisuke Tanaka
2017 J jnl
Group Signature with Deniability: How to Disavow a Signature.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Ai Ishida, Keita Emura, Goichiro Hanaoka, Yusuke Sakai, Keisuke Tanaka
2017 A conf
Group Signatures with Time-bound Keys Revisited: A New Model and an Efficient Construction.
AsiaCCS
Keita Emura, Takuya Hayashi, Ai Ishida
2017 A conf
Mis-operation Resistant Searchable Homomorphic Encryption.
AsiaCCS
Keita Emura, Takuya Hayashi, Noboru Kunihiro, Jun Sakuma
2017 B conf
New Revocable IBE in Prime-Order Groups: Adaptively Secure, Decryption Key Exposure Resistant, and with Short Public Parameters.
CT-RSA
Yohei Watanabe, Keita Emura, Jae Hong Seo
2017 — conf
Privacy-Preserving Aggregation of Time-Series Data with Public Verifiability from Simple Assumptions.
ACISP (2)
Keita Emura
2017 J jnl
Privacy-Preserving Aggregation of Time-Series Data with Public Verifiability from Simple Assumptions.
IACR Cryptol. ePrint Arch.
Keita Emura
2016 J jnl
Constructions of dynamic and non-dynamic threshold public-key encryption schemes with decryption consistency.
Theor. Comput. Sci.
Yusuke Sakai, Keita Emura, Jacob C. N. Schuldt, Goichiro Hanaoka, Kazuo Ohta
2016 B conf
Group Signature with Deniability: How to Disavow a Signature.
CANS
Ai Ishida, Keita Emura, Goichiro Hanaoka, Yusuke Sakai, Keisuke Tanaka
2016 J jnl
New Revocable IBE in Prime-Order Groups: Adaptively Secure, Decryption Key Exposure Resistant, and with Short Public Parameters.
IACR Cryptol. ePrint Arch.
Yohei Watanabe, Keita Emura, Jae Hong Seo
2016 — conf
On the Leakage Resilient Cryptography in Game-Theoretic Settings.
Trustcom/BigDataSE/ISPA
Mohammad Shahriar Rahman, Keita Emura, Shinsaku Kiyomoto
2016 — ed.
Proceedings of the 3rd ACM International Workshop on ASIA Public-Key Cryptography, AsiaPKC@AsiaCCS, Xi'an, China, May 30 - June 03, 2016
AsiaPKC@AsiaCCS
Keita Emura, Goichiro Hanaoka, Rui Zhang
2016 J jnl
Revocable hierarchical identity-based encryption via history-free approach.
Theor. Comput. Sci.
Jae Hong Seo, Keita Emura
2016 J jnl
Secure and Anonymous Communication Technique: Formal Model and Its Prototype Implementation.
IEEE Trans. Emerg. Top. Comput.
Keita Emura, Akira Kanaoka, Satoshi Ohta, Kazumasa Omote, Takeshi Takahashi
2016 J jnl
Semi-Generic Transformation of Revocable Hierarchical Identity-Based Encryption and Its DBDH Instantiation.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Keita Emura, Jae Hong Seo, Taek-Young Youn
2016 J jnl
Shortening the Libert-Peters-Yung Revocable Group Signature Scheme by Using the Random Oracle Methodology.
IACR Cryptol. ePrint Arch.
Kazuma Ohara, Keita Emura, Goichiro Hanaoka, Ai Ishida, Kazuo Ohta, Yusuke Sakai
2016 J jnl
Time-specific encryption from forward-secure encryption: generic and direct constructions.
Int. J. Inf. Sec.
Kohei Kasamatsu, Takahiro Matsuda, Keita Emura, Nuttapong Attrapadung, Goichiro Hanaoka, Hideki Imai
2016 C conf
Toward securing tire pressure monitoring systems: A case of PRESENT-based implementation.
ISITA
Keita Emura, Takuya Hayashi, Shiho Moriai
2015 — conf
A KEM/DEM-Based Construction for Secure and Anonymous Communication.
COMPSAC Workshops
Keita Emura, Akira Kanaoka, Satoshi Ohta, Takeshi Takahashi
2015 — conf
A Light-Weight Group Signature Scheme with Time-Token Dependent Linking.
LightSec
Keita Emura, Takuya Hayashi
2015 B conf
Accumulable Optimistic Fair Exchange from Verifiably Encrypted Homomorphic Signatures.
ACNS
Jae Hong Seo, Keita Emura, Keita Xagawa, Kazuki Yoneyama
2015 Misc conf
Adaptive-ID Secure Revocable Hierarchical Identity-Based Encryption.
IWSEC
Jae Hong Seo, Keita Emura
2015 J jnl
Disavowable Public Key Encryption with Non-Interactive Opening.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Ai Ishida, Keita Emura, Goichiro Hanaoka, Yusuke Sakai, Keisuke Tanaka
2015 A conf
Disavowable Public Key Encryption with Non-interactive Opening.
AsiaCCS
Ai Ishida, Keita Emura, Goichiro Hanaoka, Yusuke Sakai, Keisuke Tanaka
2015 Misc conf
Dynamic Threshold Public-Key Encryption with Decryption Consistency from Static Assumptions.
ACISP
Yusuke Sakai, Keita Emura, Jacob C. N. Schuldt, Goichiro Hanaoka, Kazuo Ohta
2015 J jnl
Generic constructions of secure-channel free searchable encryption with adaptive security.
Secur. Commun. Networks
Keita Emura, Atsuko Miyaji, Mohammad Shahriar Rahman, Kazumasa Omote
2015 J jnl
Group Signature with Deniability: How to Disavow a Signature.
IACR Cryptol. ePrint Arch.
Ai Ishida, Keita Emura, Goichiro Hanaoka, Yusuke Sakai, Keisuke Tanaka
2015 — conf
Keyword Revocable Searchable Encryption with Trapdoor Exposure Resistance and Re-generateability.
TrustCom/BigDataSE/ISPA (1)
Keita Emura, Le Trieu Phong, Yohei Watanabe
2015 J jnl
Revocable Group Signature with Constant-Size Revocation List.
Comput. J.
Nuttapong Attrapadung, Keita Emura, Goichiro Hanaoka, Yusuke Sakai
2015 B conf
Revocable Hierarchical Identity-Based Encryption: History-Free Update, Security Against Insiders, and Short Ciphertexts.
CT-RSA
Jae Hong Seo, Keita Emura
2015 J jnl
SKENO: Secret key encryption with non-interactive opening.
J. Math. Cryptol.
Jiageng Chen, Keita Emura, Atsuko Miyaji
2014 B conf
A Privacy-Enhanced Access Log Management Mechanism in SSO Systems from Nominative Signatures.
TrustCom
Sanami Nakagawa, Keita Emura, Goichiro Hanaoka, Akihisa Kodate, Takashi Nishide, Eiji Okamoto, Yusuke Sakai
2014 B conf
A Revocable Group Signature Scheme from Identity-Based Revocation Techniques: Achieving Constant-Size Revocation List.
ACNS
Nuttapong Attrapadung, Keita Emura, Goichiro Hanaoka, Yusuke Sakai
2014 C conf
A Secure Genetic Algorithm for the Subset Cover Problem and Its Application to Privacy Protection.
WISTP
Dan Bogdanov, Keita Emura, Roman Jagomägis, Akira Kanaoka, Shin'ichiro Matsuo, Jan Willemson
2014 — ed.
ASIAPKC'14, Proceedings of the 2nd ACM Wookshop on ASIA Public-Key Cryptography, June 3, 2014, Kyoto, Japan
AsiaPKC@AsiaCCS
Keita Emura, Goichiro Hanaoka, Yunlei Zhao
2014 J jnl
An r-Hiding Revocable Group Signature Scheme: Group Signatures with the Property of Hiding the Number of Revoked Users.
J. Appl. Math.
Keita Emura, Atsuko Miyaji, Kazumasa Omote
2014 — conf
Anonymous Data Collection System with Mediators.
BalkanCryptSec
Hiromi Arai, Keita Emura, Takahiro Matsuda
2014 J jnl
Building Secure and Anonymous Communication Channel: Formal Model and its Prototype Implementation.
CoRR
Keita Emura, Akira Kanaoka, Satoshi Ohta, Takeshi Takahashi
2014 Misc conf
Building secure and anonymous communication channel: formal model and its prototype implementation.
SAC
Keita Emura, Akira Kanaoka, Satoshi Ohta, Takeshi Takahashi
2014 J jnl
Group signature implies public-key encryption with non-interactive opening.
Int. J. Inf. Sec.
Keita Emura, Goichiro Hanaoka, Yusuke Sakai, Jacob C. N. Schuldt
2014 J jnl
Revocable Identity-Based Cryptosystem Revisited: Security Models and Constructions.
IEEE Trans. Inf. Forensics Secur.
Jae Hong Seo, Keita Emura
2014 J jnl
Revocable Identity-Based Encryption with Rejoin Functionality.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Jae Hong Seo, Keita Emura
2014 J jnl
Revocable hierarchical identity-based encryption.
Theor. Comput. Sci.
Jae Hong Seo, Keita Emura
2014 J jnl
Road-to-Vehicle Communications with Time-Dependent Anonymity: A Light Weight Construction and its Experimental Results.
IACR Cryptol. ePrint Arch.
Keita Emura, Takuya Hayashi
2013 J jnl
A Remark on " Efficient Revocable ID-Based Encryption with a Public Channel".
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Jae Hong Seo, Keita Emura
2013 A conf
A group signature scheme with unbounded message-dependent opening.
AsiaCCS
Kazuma Ohara, Yusuke Sakai, Keita Emura, Goichiro Hanaoka
2013 — conf
Chosen Ciphertext Secure Keyed-Homomorphic Public-Key Encryption.
Public Key Cryptography
Keita Emura, Goichiro Hanaoka, Go Ohtake, Takahiro Matsuda, Shota Yamada
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 B conf
Efficient Delegation of Key Generation and Revocation Functionalities in Identity-Based Encryption.
CT-RSA
Jae Hong Seo, Keita Emura
2013 J jnl
Efficient Delegation of Key Generation and Revocation Functionalities in Identity-Based Encryption.
IACR Cryptol. ePrint Arch.
Jae Hong Seo, Keita Emura
2013 J jnl
Generic Constructions of Secure-Channel Free Searchable Encryption with Adaptive Security.
IACR Cryptol. ePrint Arch.
Keita Emura, Atsuko Miyaji, Mohammad Shahriar Rahman, Kazumasa Omote
2013 J jnl
Methods for Restricting Message Space in Public-Key Encryption.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Yusuke Sakai, Keita Emura, Goichiro Hanaoka, Yutaka Kawai, Kazumasa Omote
2013 J jnl
On Discrete Logarithm Based Additively Homomorphic Encryption.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Jae Hong Seo, Keita Emura
2013 — conf
Privacy-Preserving Two-Party k-Means Clustering in Malicious Model.
COMPSAC Workshops
Rahena Akhter, Rownak Jahan Chowdhury, Keita Emura, Tamzida Islam, Mohammad Shahriar Rahman, Nusrat Rubaiyat
2013 — conf
Private Multiparty Set Intersection Protocol in Rational Model.
TrustCom/ISPA/IUCC
Keita Emura, Atsuko Miyaji, Mohammad Shahriar Rahman
2013 — conf
Revocable Identity-Based Encryption Revisited: Security Model and Construction.
Public Key Cryptography
Jae Hong Seo, Keita Emura
2013 J jnl
Revocable Identity-Based Encryption Revisited: Security Model and Construction.
IACR Cryptol. ePrint Arch.
Jae Hong Seo, Keita Emura
2013 — conf
Risk visualization and alerting system: architecture and proof-of-concept implementation.
SESP@CCS Asia
Takeshi Takahashi, Keita Emura, Akira Kanaoka, Shin'ichiro Matsuo, Tadashi Minowa
2012 — conf
An Intrusion and Random-Number-Leakage Resilient Scheme in Mobile Unattended WSNs.
AINA Workshops
Tatsuro Iida, Keita Emura, Atsuko Miyaji, Kazumasa Omote
2012 C conf
Constructing Secure-channel Free Searchable Encryption from Anonymous IBE with Partitioned Ciphertext Structure.
SECRYPT
Keita Emura, Mohammad Shahriar Rahman
2012 J jnl
Dynamic attribute-based signcryption without random oracles.
Int. J. Appl. Cryptogr.
Keita Emura, Atsuko Miyaji, Mohammad Shahriar Rahman
2012 C conf
Flexible Group Key Exchange with On-demand Computation of Subgroup Keys Supporting Subgroup Key Randomization.
SECRYPT
Keita Emura, Takashi Sato
2012 C conf
Group Signatures with Message-Dependent Opening.
Pairing
Yusuke Sakai, Keita Emura, Goichiro Hanaoka, Yutaka Kawai, Takahiro Matsuda, Kazumasa Omote
2012 — conf
On the Security of Dynamic Group Signatures: Preventing Signature Hijacking.
Public Key Cryptography
Yusuke Sakai, Jacob C. N. Schuldt, Keita Emura, Goichiro Hanaoka, Kazuo Ohta
2012 J jnl
On the Security of Dynamic Group Signatures: Preventing Signature Hijacking.
IACR Cryptol. ePrint Arch.
Yusuke Sakai, Jacob C. N. Schuldt, Keita Emura, Goichiro Hanaoka, Kazuo Ohta
2012 Misc conf
Time-Specific Encryption from Forward-Secure Encryption.
SCN
Kohei Kasamatsu, Takahiro Matsuda, Keita Emura, Nuttapong Attrapadung, Goichiro Hanaoka, Hideki Imai
2011 Misc conf
A Revocable Group Signature Scheme with the Property of Hiding the Number of Revoked Users.
ICISC
Keita Emura, Atsuko Miyaji, Kazumasa Omote
2011 J jnl
A Timed-Release Proxy Re-Encryption Scheme.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Keita Emura, Atsuko Miyaji, Kazumasa Omote
2011 C conf
Adaptive Secure-Channel Free Public-Key Encryption with Keyword Search Implies Timed Release Encryption.
ISC
Keita Emura, Atsuko Miyaji, Kazumasa Omote
2011 C conf
Ideal Secret Sharing Schemes with Share Selectability.
ICICS
Keita Emura, Atsuko Miyaji, Akito Nomura, Mohammad Shahriar Rahman, Masakazu Soshi
2011 C conf
Non-interactive Opening for Ciphertexts Encrypted by Shared Keys.
ICICS
Jiageng Chen, Keita Emura, Atsuko Miyaji
2011 Misc conf
Toward Dynamic Attribute-Based Signcryption (Poster).
ACISP
Keita Emura, Atsuko Miyaji, Mohammad Shahriar Rahman
2011 Misc conf
Towards Restricting Plaintext Space in Public Key Encryption.
IWSEC
Yusuke Sakai, Keita Emura, Goichiro Hanaoka, Yutaka Kawai, Kazumasa Omote
2010 C conf
A Timed-Release Proxy Re-encryption Scheme and Its Application to Fairly-Opened Multicast Communication.
ProvSec
Keita Emura, Atsuko Miyaji, Kazumasa Omote
2010 J jnl
A ciphertext-policy attribute-based encryption scheme with constant ciphertext length.
Int. J. Appl. Cryptogr.
Keita Emura, Atsuko Miyaji, Kazumasa Omote, Akito Nomura, Masakazu Soshi
2010 C conf
An Anonymous Designated Verifier Signature Scheme with Revocation: How to Protect a Company's Reputation.
ProvSec
Keita Emura, Atsuko Miyaji, Kazumasa Omote
2010 — conf
An Identity-Based Proxy Re-Encryption Scheme with Source Hiding Property, and its Application to a Mailing-List System.
EuroPKI
Keita Emura, Atsuko Miyaji, Kazumasa Omote
2010 — conf
Efficient Privacy-Preserving Data Mining in Malicious Model.
ADMA (1)
Keita Emura, Atsuko Miyaji, Mohammad Shahriar Rahman
2010 Misc conf
Group Signature Implies PKE with Non-interactive Opening and Threshold PKE.
IWSEC
Keita Emura, Goichiro Hanaoka, Yusuke Sakai
2009 B conf
A Certificate Revocable Anonymous Authentication Scheme with Designated Verifier.
ARES
Keita Emura, Atsuko Miyaji, Kazumasa Omote
2009 C conf
A Ciphertext-Policy Attribute-Based Encryption Scheme with Constant Ciphertext Length.
ISPEC
Keita Emura, Atsuko Miyaji, Akito Nomura, Kazumasa Omote, Masakazu Soshi
2009 J jnl
A Dynamic Attribute-Based Group Signature Scheme and Its Application in an Anonymous Survey for the Collection of Attribute Statistics.
Inf. Media Technol.
Keita Emura, Atsuko Miyaji, Kazumasa Omote
2009 J jnl
A Dynamic Attribute-Based Group Signature Scheme and Its Application in an Anonymous Survey for the Collection of Attribute Statistics.
J. Inf. Process.
Keita Emura, Atsuko Miyaji, Kazumasa Omote
2009 B conf
A Dynamic Attribute-Based Group Signature Scheme and its Application in an Anonymous Survey for the Collection of Attribute Statistics.
ARES
Keita Emura, Atsuko Miyaji, Kazumasa Omote
2009 Misc conf
A Selectable
WISA
Keita Emura, Atsuko Miyaji, Kazumasa Omote