Keita Emura

ORCID

Publication Activity (10 Years)

Years Active: 2009-2024
Publications (10 Years): 114

Top Venues

IACR Cryptol. ePrint Arch.

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

Theor. Comput. Sci.

CoRR

Publications

Kyoichi Asano, Keita Emura, Atsushi Takayasu
More Efficient Adaptively Secure Lattice-Based IBE with Equality Test in the Standard Model. IEICE Trans. Fundam. Electron. Commun. Comput. Sci. 107 (3) (2024)
Keita Emura
On the Feasibility of Identity-Based Encryption with Equality Test Against Insider Attacks. ACISP (1) (2024)
Keita Emura
Generic Construction of Forward Secure Public Key Authenticated Encryption with Keyword Search. ACNS (1) (2024)
Keita Emura, Shingo Sato, Atsushi Takayasu
Attribute-based Keyed (Fully) Homomorphic Encryption. IACR Cryptol. ePrint Arch. 2024 (2024)
Kota Chin, Keita Emura, Shingo Sato, Kazumasa Omote
A Sealed-Bid Auction with Fund Binding: Preventing Maximum Bidding Price Leakage. IEICE Trans. Inf. Syst. 107 (5) (2024)
Keita Emura
Generic Construction of Public-Key Authenticated Encryption with Keyword Search Revisited. IEICE Trans. Fundam. Electron. Commun. Comput. Sci. 107 (3) (2024)
Masaki Miyamoto, Kaoru Teranishi, Keita Emura, Kiminao Kogiso
Cybersecurity-Enhanced Encrypted Control System Using Keyed-Homomorphic Public Key Encryption. IEEE Access 11 (2023)
Keita Emura
Generic Construction of Broadcast Authenticated Encryption with Keyword Search. IACR Cryptol. ePrint Arch. 2023 (2023)
Keita Emura, Atsushi Takayasu
A Generic Construction of CCA-Secure Identity-Based Encryption with Equality Test against Insider Attacks. IEICE Trans. Fundam. Electron. Commun. Comput. Sci. 106 (3) (2023)
Keita Emura, Masato Yoshimi
An End-to-End Encrypted Cache System with Time-Dependent Access Control. ICISSP (2023)
Hayato Kimura, Keita Emura, Takanori Isobe, Ryoma Ito, Kazuto Ogawa, Toshihiro Ohigashi
A Deeper Look into Deep Learning-based Output Prediction Attacks Using Weak SPN Block Ciphers. J. Inf. Process. 31 (2023)
Itaru Kaneko, Le Trieu Phong, Keita Emura, Emi Yuda
Can Sleep Apnea Be Detected from Human Pulse Waveform with Laplace Noise? J. Adv. Comput. Intell. Intell. Informatics 27 (5) (2023)
Keita Emura
Generic Construction of Dual-Server Public Key Authenticated Encryption with Keyword Search. IACR Cryptol. ePrint Arch. 2023 (2023)
Kota Chin, Keita Emura, Kazumasa Omote
An Anonymous yet Accountable Contract Wallet System using Account Abstraction. CoRR (2023)
Keita Emura, Masato Yoshimi
An End-To-End Encrypted Cache System with Time-Dependent Access Control. CoRR (2023)
Kaisei Kajita, Keita Emura, Kazuto Ogawa, Ryo Nojima, Go Ohtake
Continuous Group Key Agreement with Flexible Authorization and Its Applications. IWSPA@CODASPY (2023)
Keita Emura
Generic Construction of Forward Secure Public Key Authenticated Encryption with Keyword Search. IACR Cryptol. ePrint Arch. 2023 (2023)
Keita Emura
On the Feasibility of Identity-based Encryption with Equality Test against Insider Attacks. IACR Cryptol. ePrint Arch. 2023 (2023)
Keita Emura, Kaisei Kajita, Go Ohtake
Outsider-Anonymous Broadcast Encryption with Keyword Search: Generic Construction, CCA Security, and with Sublinear Ciphertexts. IACR Cryptol. ePrint Arch. 2023 (2023)
Kyoichi Asano, Keita Emura, Atsushi Takayasu
More Efficient Adaptively Secure Lattice-based IBE with Equality Test in the Standard Model. IACR Cryptol. ePrint Arch. 2022 (2022)
Kyoichi Asano, Keita Emura, Atsushi Takayasu, Yohei Watanabe
A Generic Construction of CCA-Secure Attribute-Based Encryption with Equality Test. ProvSec (2022)
Kyoichi Asano, Keita Emura, Atsushi Takayasu
More Efficient Adaptively Secure Lattice-Based IBE with Equality Test in the Standard Model. ISC (2022)
Keita Emura, Kaisei Kajita, Ryo Nojima, Kazuto Ogawa, Go Ohtake
Membership Privacy for Asynchronous Group Messaging. IACR Cryptol. ePrint Arch. 2022 (2022)
Shingo Sato, Keita Emura, Atsushi Takayasu
Keyed-Fully Homomorphic Encryption Without Indistinguishability Obfuscation. ACNS (2022)
Keita Emura, Kaisei Kajita, Ryo Nojima, Kazuto Ogawa, Go Ohtake
Membership Privacy for Asynchronous Group Messaging. WISA (2022)
Keita Emura
Generic Construction of Public-key Authenticated Encryption with Keyword Search Revisited: Stronger Security and Efficient Construction. IACR Cryptol. ePrint Arch. 2022 (2022)
Keita Emura, Shuichi Katsumata, Yohei Watanabe
Identity-based encryption with security against the KGC: A formal model and its instantiations. Theor. Comput. Sci. 900 (2022)
Shingo Sato, Keita Emura, Atsushi Takayasu
Keyed-Fully Homomorphic Encryption without Indistinguishability Obfuscation. IACR Cryptol. ePrint Arch. 2022 (2022)
Keita Emura, Shiho Moriai, Takuma Nakajima, Masato Yoshimi
Cache-22: A Highly Deployable End-To-End Encrypted Cache System with Post-Quantum Security. IACR Cryptol. ePrint Arch. 2022 (2022)
Keita Emura
Generic Construction of Public-key Authenticated Encryption with Keyword Search Revisited: Stronger Security and Efficient Construction. APKC@AsiaCCS (2022)
Kota Chin, Keita Emura, Kazumasa Omote, Shingo Sato
A Sealed-bid Auction with Fund Binding: Preventing Maximum Bidding Price Leakage. CoRR (2022)
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
Privacy-Preserving Federated Learning for Detecting Fraudulent Financial Transactions in Japanese Banks. J. Inf. Process. 30 (2022)
Keita Emura, Kaisei Kajita, Ryo Nojima, Kazuto Ogawa, Go Ohtake
Providing Membership Privacy to the Asynchronous Ratcheting Trees Protocol without losing Scalability. J. Wirel. Mob. Networks Ubiquitous Comput. Dependable Appl. 13 (4) (2022)
Keita Emura, Ryoma Ito, Sachiko Kanamori, Ryo Nojima, Yohei Watanabe
State-free End-to-End Encrypted Storage and Chat Systems based on Searchable Encryption. ICEIS (2) (2022)
Hayato Kimura, Keita Emura, Takanori Isobe, Ryoma Ito, Kazuto Ogawa, Toshihiro Ohigashi
Output Prediction Attacks on Block Ciphers Using Deep Learning. ACNS Workshops (2022)
Kota Chin, Keita Emura, Kazumasa Omote, Shingo Sato
A Sealed-bid Auction with Fund Binding: Preventing Maximum Bidding Price Leakage. Blockchain (2022)
Kaisei Kajita, Keita Emura, Kazuto Ogawa, Ryo Nojima, Go Ohtake
Continuous Group Key Agreement with Flexible Authorization and Its Applications. IACR Cryptol. ePrint Arch. 2022 (2022)
Tomoki Fujitani, Keita Emura, Kazumasa Omote
A Privacy-Preserving Enforced Bill Collection System using Smart Contracts. AsiaJCIS (2021)
Keita Emura, Atsushi Takayasu, Yohei Watanabe
Generic Constructions of Revocable Hierarchical Identity-based Encryption. IACR Cryptol. ePrint Arch. 2021 (2021)
Hiromi Arai, Keita Emura, Takuya Hayashi
Privacy-Preserving Data Analysis: Providing Traceability without Big Brother. IEICE Trans. Fundam. Electron. Commun. Comput. Sci. (1) (2021)
Keita Emura, Atsushi Takayasu, Yohei Watanabe
Efficient identity-based encryption with Hierarchical key-insulation from HIBE. Des. Codes Cryptogr. 89 (10) (2021)
Kyoichi Asano, Keita Emura, Atsushi Takayasu, Yohei Watanabe
A Generic Construction of CCA-secure Attribute-based Encryption with Equality Test. IACR Cryptol. ePrint Arch. 2021 (2021)
Hayato Kimura, Keita Emura, Takanori Isobe, Ryoma Ito, Kazuto Ogawa, Toshihiro Ohigashi
Output Prediction Attacks on SPN Block Ciphers using Deep Learning. IACR Cryptol. ePrint Arch. 2021 (2021)
Teppei Sato, Keita Emura, Tomoki Fujitani, Kazumasa Omote
An Anonymous Trust-Marking Scheme on Blockchain Systems. IEEE Access 9 (2021)
Ai Kitagawa, Yusuke Sakai, Keita Emura, Goichiro Hanaoka, Keisuke Tanaka
Fully Anonymous Group Signature with Verifier-Local Revocation. IACR Cryptol. ePrint Arch. 2021 (2021)
Keita Emura, Ryoma Ito, Sachiko Kanamori, Ryo Nojima, Yohei Watanabe
State-free End-to-End Encrypted Storage and Chat Systems based on Searchable Encryption. IACR Cryptol. ePrint Arch. 2021 (2021)
Teppei Sato, Keita Emura, Tomoki Fujitani, Kazumasa Omote
An Anonymous Trust-Marking Scheme on Blockchain Systems. IEEE ICBC (2021)
Tatsuya Suzuki, Keita Emura, Toshihiro Ohigashi, Kazumasa Omote
Verifiable Functional Encryption Using Intel SGX. ProvSec (2021)
Keita Emura
On the Security of Keyed-Homomorphic PKE: Preventing Key Recovery Attacks and Ciphertext Validity Attacks. IEICE Trans. Fundam. Electron. Commun. Comput. Sci. (1) (2021)
Shuntaro Ema, Yuta Sato, Keita Emura, Toshihiro Ohigashi
Implementation and Evaluation of an Identity-Based Encryption with Security Against the KGC. CANDAR (Workshops) (2021)
Keita Emura, Atsushi Takayasu, Yohei Watanabe
Adaptively secure revocable hierarchical IBE from k-linear assumption. Des. Codes Cryptogr. 89 (7) (2021)
Keita Emura, Jae Hong Seo, Yohei Watanabe
Efficient revocable identity-based encryption with short public parameters. Theor. Comput. Sci. 863 (2021)
Tatsuya Suzuki, Keita Emura, Toshihiro Ohigashi, Kazumasa Omote
Verifiable Functional Encryption using Intel SGX. IACR Cryptol. ePrint Arch. 2020 (2020)
Keita Emura, Takuya Hayashi, Ai Ishida
Group Signatures with Time-Bound Keys Revisited: A New Model, an Efficient Construction, and its Implementation. IEEE Trans. Dependable Secur. Comput. 17 (2) (2020)
Keita Emura, Atsushi Takayasu, Yohei Watanabe
Efficient Identity-Based Encryption with Hierarchical Key-Insulation from HIBE. IACR Cryptol. ePrint Arch. 2020 (2020)
Keita Emura, Atsushi Takayasu, Yohei Watanabe
Adaptively Secure Revocable Hierarchical IBE from k-linear Assumption. IACR Cryptol. ePrint Arch. 2020 (2020)
Teppei Sato, Keita Emura, Tomoki Fujitani, Kazumasa Omote
An Anonymous Trust-Marking Scheme on Blockchain Systems. CoRR (2020)
Hiroshi Okano, Keita Emura, Takuya Ishibashi, Toshihiro Ohigashi, Tatsuya Suzuki
Implementation of a Strongly Robust Identity-Based Encryption Scheme over Type-3 Pairings. Int. J. Netw. Comput. 10 (2) (2020)
Keita Emura, Takuya Hayashi
A Revocable Group Signature Scheme with Scalability from Simple Assumptions. IEICE Trans. Fundam. Electron. Commun. Comput. Sci. (1) (2020)
Keita Emura, Shiho Moriai, Takuma Nakajima, Masato Yoshimi
Cache-22: A Highly Deployable Encrypted Cache System. ISITA (2020)
Keita Emura, Katsuhiko Ito, Toshihiro Ohigashi
Secure-channel free searchable encryption with multiple keywords: A generic construction, an instantiation, and its implementation. J. Comput. Syst. Sci. 114 (2020)
Ai Ishida, Yusuke Sakai, Keita Emura, Goichiro Hanaoka, Keisuke Tanaka
Proper Usage of the Group Signature Scheme in ISO/IEC 20008-2. IACR Cryptol. ePrint Arch. 2019 (2019)
Hiroshi Okano, Keita Emura, Takuya Ishibashi, Toshihiro Ohigashi, Tatsuya Suzuki
Implementation of a Strongly Robust Identity-Based Encryption Scheme over Type-3 Pairings. IACR Cryptol. ePrint Arch. 2019 (2019)
Kazuma Ohara, Keita Emura, Goichiro Hanaoka, Ai Ishida, Kazuo Ohta, Yusuke Sakai
Shortening the Libert-Peters-Yung Revocable Group Signature Scheme by Using the Random Oracle Methodology. IEICE Trans. Fundam. Electron. Commun. Comput. Sci. (9) (2019)
Ai Ishida, Yusuke Sakai, Keita Emura, Goichiro Hanaoka, Keisuke Tanaka
Proper Usage of the Group Signature Scheme in ISO/IEC 20008-2. AsiaCCS (2019)
Keita Emura
Session details: Invited Talk. APKC@AsiaCCS (2019)
Keita Emura, Shuichi Katsumata, Yohei Watanabe
Identity-Based Encryption with Security Against the KGC: A Formal Model and Its Instantiation from Lattices. ESORICS (2) (2019)
Tatsuya Suzuki, Keita Emura, Toshihiro Ohigashi
A Generic Construction of Integrated Secure-Channel Free PEKS and PKE and its Application to EMRs in Cloud Storage. J. Medical Syst. 43 (5) (2019)
Keita Emura, Hayato Kimura, Toshihiro Ohigashi, Tatsuya Suzuki
Privacy-Preserving Aggregation of Time-Series Data with Public Verifiability from Simple Assumptions and Its Implementations. Comput. J. 62 (4) (2019)
Keita Emura, Goichiro Hanaoka, Yutaka Kawai, Takahiro Matsuda, Kazuma Ohara, Kazumasa Omote, Yusuke Sakai
Group Signatures with Message-Dependent Opening: Formal Definitions and Constructions. Secur. Commun. Networks 2019 (2019)
Keita Emura, Shuichi Katsumata, Yohei Watanabe
Identity-Based Encryption with Security against the KGC: A Formal Model and Its Instantiations. IACR Cryptol. ePrint Arch. 2019 (2019)
Hiroshi Okano, Keita Emura, Takuya Ishibashi, Toshihiro Ohigashi, Tatsuya Suzuki
Implementation of a Strongly Robust Identity-Based Encryption Scheme over Type-3 Pairings. CANDAR (2019)
Keita Emura, Takuya Hayashi
A Revocable Group Signature Scheme with Scalability from Simple Assumptions and Its Application to Identity Management. IACR Cryptol. ePrint Arch. 2019 (2019)
Ai Ishida, Yusuke Sakai, Keita Emura, Goichiro Hanaoka, Keisuke Tanaka
Fully Anonymous Group Signature with Verifier-Local Revocation. SCN (2018)
Keita Emura, Takuya Hayashi
Road-to-Vehicle Communications With Time-Dependent Anonymity: A Lightweight Construction and Its Experimental Results. IEEE Trans. Veh. Technol. 67 (2) (2018)
Kotoko Yamada, Nuttapong Attrapadung, Keita Emura, Goichiro Hanaoka, Keisuke Tanaka
Generic Constructions for Fully Secure Revocable Attribute-Based Encryption. IEICE Trans. Fundam. Electron. Commun. Comput. Sci. (9) (2018)
Tatsuya Suzuki, Keita Emura, Toshihiro Ohigashi
A Generic Construction of Integrated Secure-Channel Free PEKS and PKE. ISPEC (2018)
Jae Hong Seo, Keita Emura, Keita Xagawa, Kazuki Yoneyama
Accumulable optimistic fair exchange from verifiably encrypted homomorphic signatures. Int. J. Inf. Sec. 17 (2) (2018)
Keita Emura, Goichiro Hanaoka, Koji Nuida, Go Ohtake, Takahiro Matsuda, Shota Yamada
Chosen ciphertext secure keyed-homomorphic public-key cryptosystems. Des. Codes Cryptogr. 86 (8) (2018)
Keita Emura, Takuya Hayashi
A Revocable Group Signature Scheme with Scalability from Simple Assumptions and Its Implementation. ISC (2018)
Keita Emura
A Generic Construction of Secure-Channel Free Searchable Encryption with Multiple Keywords. NSS (2017)
Hiromi Arai, Keita Emura, Takuya Hayashi
A Framework of Privacy Preserving Anomaly Detection: Providing Traceability without Big Brother. WPES@CCS (2017)
Sanami Nakagawa, Takashi Nishide, Eiji Okamoto, Keita Emura, Goichiro Hanaoka, Yusuke Sakai, Akihisa Kodate
A privacy-enhanced access log management mechanism in SSO systems from nominative signatures. Int. J. Appl. Cryptogr. 3 (4) (2017)
Keita Emura, Takuya Hayashi, Ai Ishida
Group Signatures with Time-bound Keys Revisited: A New Model and an Efficient Construction. AsiaCCS (2017)
Keita Emura
Privacy-Preserving Aggregation of Time-Series Data with Public Verifiability from Simple Assumptions. ACISP (2) (2017)
Keita Emura, Takuya Hayashi, Noboru Kunihiro, Jun Sakuma
Mis-operation Resistant Searchable Homomorphic Encryption. AsiaCCS (2017)
Yohei Watanabe, Keita Emura, Jae Hong Seo
New Revocable IBE in Prime-Order Groups: Adaptively Secure, Decryption Key Exposure Resistant, and with Short Public Parameters. CT-RSA (2017)
Ai Ishida, Keita Emura, Goichiro Hanaoka, Yusuke Sakai, Keisuke Tanaka
Group Signature with Deniability: How to Disavow a Signature. IEICE Trans. Fundam. Electron. Commun. Comput. Sci. (9) (2017)
Keita Emura
Privacy-Preserving Aggregation of Time-Series Data with Public Verifiability from Simple Assumptions. IACR Cryptol. ePrint Arch. 2017 (2017)
Keita Emura, Akira Kanaoka, Satoshi Ohta, Takeshi Takahashi
Establishing secure and anonymous communication channel: KEM/DEM-based construction and its implementation. J. Inf. Secur. Appl. 34 (2017)
Kotoko Yamada, Nuttapong Attrapadung, Keita Emura, Goichiro Hanaoka, Keisuke Tanaka
Generic Constructions for Fully Secure Revocable Attribute-Based Encryption. ESORICS (2) (2017)
Keita Emura, Akira Kanaoka, Satoshi Ohta, Kazumasa Omote, Takeshi Takahashi
Secure and Anonymous Communication Technique: Formal Model and Its Prototype Implementation. IEEE Trans. Emerg. Top. Comput. 4 (1) (2016)
Keita Emura, Takuya Hayashi, Shiho Moriai
Toward securing tire pressure monitoring systems: A case of PRESENT-based implementation. ISITA (2016)
Yusuke Sakai, Keita Emura, Jacob C. N. Schuldt, Goichiro Hanaoka, Kazuo Ohta
Constructions of dynamic and non-dynamic threshold public-key encryption schemes with decryption consistency. Theor. Comput. Sci. 630 (2016)
Ai Ishida, Keita Emura, Goichiro Hanaoka, Yusuke Sakai, Keisuke Tanaka
Group Signature with Deniability: How to Disavow a Signature. CANS (2016)
Keita Emura, Jae Hong Seo, Taek-Young Youn
Semi-Generic Transformation of Revocable Hierarchical Identity-Based Encryption and Its DBDH Instantiation. IEICE Trans. Fundam. Electron. Commun. Comput. Sci. (1) (2016)
Mohammad Shahriar Rahman, Keita Emura, Shinsaku Kiyomoto
On the Leakage Resilient Cryptography in Game-Theoretic Settings. Trustcom/BigDataSE/ISPA (2016)
Kazuma Ohara, Keita Emura, Goichiro Hanaoka, Ai Ishida, Kazuo Ohta, Yusuke Sakai
Shortening the Libert-Peters-Yung Revocable Group Signature Scheme by Using the Random Oracle Methodology. IACR Cryptol. ePrint Arch. 2016 (2016)
Yohei Watanabe, Keita Emura, Jae Hong Seo
New Revocable IBE in Prime-Order Groups: Adaptively Secure, Decryption Key Exposure Resistant, and with Short Public Parameters. IACR Cryptol. ePrint Arch. 2016 (2016)
Kohei Kasamatsu, Takahiro Matsuda, Keita Emura, Nuttapong Attrapadung, Goichiro Hanaoka, Hideki Imai
Time-specific encryption from forward-secure encryption: generic and direct constructions. Int. J. Inf. Sec. 15 (5) (2016)

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Publication Activity (10 Years)

Top Topics

Top Venues

Keita Emura