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ORCIDKeita Emura
江村 恵太
Person information
- unicode name: 江村 恵太
- affiliation: Kanazawa University, Ishikawa, Japan
- affiliation (former): National Institute of Information and Communications Technology (NICT), Tokyo, Japan
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2020 – today
- 2024
[j54]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): 248-259 (2024)- [j53]Keita Emura:
Generic Construction of Public-Key Authenticated Encryption with Keyword Search Revisited. IEICE Trans. Fundam. Electron. Commun. Comput. Sci. 107(3): 260-274 (2024) - [j52]Keita Emura, Kaisei Kajita, Go Ohtake:
Outsider-Anonymous Broadcast Encryption with Keyword Search: Generic Construction, CCA Security, and with Sublinear Ciphertexts. IEICE Trans. Fundam. Electron. Commun. Comput. Sci. 107(9): 1465-1477 (2024) - [j51]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): 615-624 (2024) - [c77]Keita Emura
:
On the Feasibility of Identity-Based Encryption with Equality Test Against Insider Attacks. ACISP (1) 2024: 261-280 - [c76]Keita Emura:
Generic Construction of Forward Secure Public Key Authenticated Encryption with Keyword Search. ACNS (1) 2024: 237-256 - [c75]Yuto Imura, Keita Emura:
An Identity Management System Using Group Signatures with Message-Dependent Opening. AsiaJCIS 2024: 40-47 - [c74]Keita Emura, Shingo Sato, Atsushi Takayasu:
Attribute-Based Keyed Fully Homomorphic Encryption. SCN (2) 2024: 47-67 - [i39]Keita Emura, Shingo Sato, Atsushi Takayasu:
Attribute-based Keyed (Fully) Homomorphic Encryption. IACR Cryptol. ePrint Arch. 2024: 226 (2024) - 2023
- [j50]Masaki Miyamoto, Kaoru Teranishi, Keita Emura, Kiminao Kogiso:
Cybersecurity-Enhanced Encrypted Control System Using Keyed-Homomorphic Public Key Encryption. IEEE Access 11: 45749-45760 (2023) - [j49]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): 193-202 (2023) - [j48]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): 942-947 (2023) - [j47]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: 550-561 (2023) - [c73]Kaisei Kajita, Keita Emura, Kazuto Ogawa, Ryo Nojima, Go Ohtake:
Continuous Group Key Agreement with Flexible Authorization and Its Applications. IWSPA@CODASPY 2023: 3-13 - [c72]Keita Emura, Masato Yoshimi:
An End-to-End Encrypted Cache System with Time-Dependent Access Control. ICISSP 2023: 321-328 - [i38]Keita Emura, Masato Yoshimi:
An End-To-End Encrypted Cache System with Time-Dependent Access Control. CoRR abs/2302.11292 (2023) - [i37]Kota Chin, Keita Emura, Kazumasa Omote:
An Anonymous yet Accountable Contract Wallet System using Account Abstraction. CoRR abs/2309.03480 (2023) - [i36]Keita Emura:
Generic Construction of Broadcast Authenticated Encryption with Keyword Search. IACR Cryptol. ePrint Arch. 2023: 401 (2023) - [i35]Keita Emura:
Generic Construction of Forward Secure Public Key Authenticated Encryption with Keyword Search. IACR Cryptol. ePrint Arch. 2023: 412 (2023) - [i34]Keita Emura:
Generic Construction of Dual-Server Public Key Authenticated Encryption with Keyword Search. IACR Cryptol. ePrint Arch. 2023: 425 (2023) - [i33]Keita Emura:
On the Feasibility of Identity-based Encryption with Equality Test against Insider Attacks. IACR Cryptol. ePrint Arch. 2023: 665 (2023) - [i32]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: 1119 (2023) - 2022
- [j46]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: 789-795 (2022) - [j45]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): 105-123 (2022) - [j44]Keita Emura, Shuichi Katsumata, Yohei Watanabe:
Identity-based encryption with security against the KGC: A formal model and its instantiations. Theor. Comput. Sci. 900: 97-119 (2022) - [c71]Shingo Sato, Keita Emura, Atsushi Takayasu:
Keyed-Fully Homomorphic Encryption Without Indistinguishability Obfuscation. ACNS 2022: 3-23 - [c70]Hayato Kimura, Keita Emura, Takanori Isobe, Ryoma Ito, Kazuto Ogawa, Toshihiro Ohigashi:
Output Prediction Attacks on Block Ciphers Using Deep Learning. ACNS Workshops 2022: 248-276 - [c69]Keita Emura:
Generic Construction of Public-key Authenticated Encryption with Keyword Search Revisited: Stronger Security and Efficient Construction. APKC@AsiaCCS 2022: 39-49 - [c68]Kota Chin, Keita Emura, Kazumasa Omote, Shingo Sato:
A Sealed-bid Auction with Fund Binding: Preventing Maximum Bidding Price Leakage. Blockchain 2022: 398-405 - [c67]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: 106-113 - [c66]Kyoichi Asano, Keita Emura, Atsushi Takayasu:
More Efficient Adaptively Secure Lattice-Based IBE with Equality Test in the Standard Model. ISC 2022: 75-83 - [c65]Kyoichi Asano, Keita Emura, Atsushi Takayasu, Yohei Watanabe:
A Generic Construction of CCA-Secure Attribute-Based Encryption with Equality Test. ProvSec 2022: 3-19 - [c64]Keita Emura, Kaisei Kajita, Ryo Nojima, Kazuto Ogawa, Go Ohtake:
Membership Privacy for Asynchronous Group Messaging. WISA 2022: 131-142 - [i31]Kota Chin, Keita Emura, Kazumasa Omote, Shingo Sato:
A Sealed-bid Auction with Fund Binding: Preventing Maximum Bidding Price Leakage. CoRR abs/2207.10823 (2022) - [i30]Shingo Sato, Keita Emura, Atsushi Takayasu:
Keyed-Fully Homomorphic Encryption without Indistinguishability Obfuscation. IACR Cryptol. ePrint Arch. 2022: 17 (2022) - [i29]Keita Emura, Kaisei Kajita, Ryo Nojima, Kazuto Ogawa, Go Ohtake:
Membership Privacy for Asynchronous Group Messaging. IACR Cryptol. ePrint Arch. 2022: 46 (2022) - [i28]Keita Emura:
Generic Construction of Public-key Authenticated Encryption with Keyword Search Revisited: Stronger Security and Efficient Construction. IACR Cryptol. ePrint Arch. 2022: 72 (2022) - [i27]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: 220 (2022) - [i26]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: 1693 (2022) - [i25]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: 1768 (2022) - 2021
- [j43]Teppei Sato, Keita Emura, Tomoki Fujitani, Kazumasa Omote:
An Anonymous Trust-Marking Scheme on Blockchain Systems. IEEE Access 9: 108772-108781 (2021) - [j42]Keita Emura, Atsushi Takayasu, Yohei Watanabe:
Adaptively secure revocable hierarchical IBE from k-linear assumption. Des. Codes Cryptogr. 89(7): 1535-1574 (2021) - [j41]Keita Emura, Atsushi Takayasu, Yohei Watanabe:
Efficient identity-based encryption with Hierarchical key-insulation from HIBE. Des. Codes Cryptogr. 89(10): 2397-2431 (2021) - [j40]Hiromi Arai, Keita Emura, Takuya Hayashi:
Privacy-Preserving Data Analysis: Providing Traceability without Big Brother. IEICE Trans. Fundam. Electron. Commun. Comput. Sci. 104-A(1): 2-19 (2021) - [j39]Keita Emura:
On the Security of Keyed-Homomorphic PKE: Preventing Key Recovery Attacks and Ciphertext Validity Attacks. IEICE Trans. Fundam. Electron. Commun. Comput. Sci. 104-A(1): 310-314 (2021) - [j38]Keita Emura, Jae Hong Seo, Yohei Watanabe:
Efficient revocable identity-based encryption with short public parameters. Theor. Comput. Sci. 863: 127-155 (2021) - [c63]Tomoki Fujitani, Keita Emura, Kazumasa Omote:
A Privacy-Preserving Enforced Bill Collection System using Smart Contracts. AsiaJCIS 2021: 51-60 - [c62]Shuntaro Ema, Yuta Sato, Keita Emura, Toshihiro Ohigashi:
Implementation and Evaluation of an Identity-Based Encryption with Security Against the KGC. CANDAR (Workshops) 2021: 320-325 - [c61]Teppei Sato, Keita Emura, Tomoki Fujitani, Kazumasa Omote:
An Anonymous Trust-Marking Scheme on Blockchain Systems. IEEE ICBC 2021: 1-3 - [c60]Tatsuya Suzuki, Keita Emura, Toshihiro Ohigashi, Kazumasa Omote:
Verifiable Functional Encryption Using Intel SGX. ProvSec 2021: 215-240 - [e6]Keita Emura, Yuntao Wang:
Proceedings of the 8th on ASIA Public-Key Cryptography Workshop, APKC@AsiaCCS 2021, Virtual Event Hong Kong, 7 June, 2021. ACM 2021, ISBN 978-1-4503-8401-8 [contents] - [i24]Ai Kitagawa, Yusuke Sakai, Keita Emura, Goichiro Hanaoka, Keisuke Tanaka:
Fully Anonymous Group Signature with Verifier-Local Revocation. IACR Cryptol. ePrint Arch. 2021: 170 (2021) - [i23]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: 401 (2021) - [i22]Keita Emura, Atsushi Takayasu, Yohei Watanabe:
Generic Constructions of Revocable Hierarchical Identity-based Encryption. IACR Cryptol. ePrint Arch. 2021: 515 (2021) - [i21]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: 953 (2021) - [i20]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: 1371 (2021) - 2020
- [j37]Keita Emura, Takuya Hayashi:
A Revocable Group Signature Scheme with Scalability from Simple Assumptions. IEICE Trans. Fundam. Electron. Commun. Comput. Sci. 103-A(1): 125-140 (2020) - [j36]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): 174-188 (2020) - [j35]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: 107-125 (2020) - [j34]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): 292-305 (2020) - [c59]Keita Emura, Shiho Moriai, Takuma Nakajima, Masato Yoshimi:
Cache-22: A Highly Deployable Encrypted Cache System. ISITA 2020: 465-469 - [e5]Keita Emura, Naoto Yanai:
Proceedings of the 7th on ASIA Public-Key Cryptography Workshop, APKC@AsiaCCS 2020, Taipei, Taiwan, October 6, 2020. ACM 2020, ISBN 978-1-4503-7607-5 [contents] - [i19]Teppei Sato, Keita Emura, Tomoki Fujitani, Kazumasa Omote:
An Anonymous Trust-Marking Scheme on Blockchain Systems. CoRR abs/2010.00206 (2020) - [i18]Keita Emura, Atsushi Takayasu, Yohei Watanabe:
Adaptively Secure Revocable Hierarchical IBE from k-linear Assumption. IACR Cryptol. ePrint Arch. 2020: 886 (2020) - [i17]Keita Emura, Atsushi Takayasu, Yohei Watanabe:
Efficient Identity-Based Encryption with Hierarchical Key-Insulation from HIBE. IACR Cryptol. ePrint Arch. 2020: 1087 (2020) - [i16]Tatsuya Suzuki, Keita Emura, Toshihiro Ohigashi, Kazumasa Omote:
Verifiable Functional Encryption using Intel SGX. IACR Cryptol. ePrint Arch. 2020: 1221 (2020)
2010 – 2019
- 2019
- [j33]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): 614-630 (2019) - [j32]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. 102-A(9): 1101-1117 (2019) - [j31]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): 128:1-128:15 (2019) - [j30]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: 4872403:1-4872403:36 (2019) - [c58]Keita Emura:
Session details: Invited Talk. APKC@AsiaCCS 2019 - [c57]Ai Ishida, Yusuke Sakai, Keita Emura, Goichiro Hanaoka, Keisuke Tanaka:
Proper Usage of the Group Signature Scheme in ISO/IEC 20008-2. AsiaCCS 2019: 515-528 - [c56]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: 113-133 - [c55]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: 191-196 - [e4]Keita Emura, Takaaki Mizuki:
Proceedings of the 6th on ASIA Public-Key Cryptography Workshop, APKC@AsiaCCS 2019, Auckland, New Zealand, July 8, 2019. ACM 2019, ISBN 978-1-4503-6784-4 [contents] - [i15]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: 64 (2019) - [i14]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: 284 (2019) - [i13]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: 1384 (2019) - [i12]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: 1485 (2019) - 2018
- [j29]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): 1623-1683 (2018) - [j28]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. 101-A(9): 1456-1472 (2018) - [j27]Jae Hong Seo, Keita Emura, Keita Xagawa, Kazuki Yoneyama:
Accumulable optimistic fair exchange from verifiably encrypted homomorphic signatures. Int. J. Inf. Sec. 17(2): 193-220 (2018) - [j26]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): 1582-1597 (2018) - [c54]Tatsuya Suzuki, Keita Emura, Toshihiro Ohigashi:
A Generic Construction of Integrated Secure-Channel Free PEKS and PKE. ISPEC 2018: 69-86 - [c53]Keita Emura, Takuya Hayashi:
A Revocable Group Signature Scheme with Scalability from Simple Assumptions and Its Implementation. ISC 2018: 442-460 - [c52]Ai Ishida, Yusuke Sakai, Keita Emura, Goichiro Hanaoka, Keisuke Tanaka:
Fully Anonymous Group Signature with Verifier-Local Revocation. SCN 2018: 23-42 - [e3]Keita Emura, Jae Hong Seo, Yohei Watanabe:
Proceedings of the 5th ACM on ASIA Public-Key Cryptography Workshop, APKC@AsiaCCS, Incheon, Republic of Korea, June 4, 2018. ACM 2018 [contents] - 2017
- [j25]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. 100-A(9): 1825-1837 (2017) - [j24]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): 394-406 (2017) - [j23]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: 84-91 (2017) - [c51]Keita Emura:
Privacy-Preserving Aggregation of Time-Series Data with Public Verifiability from Simple Assumptions. ACISP (2) 2017: 193-213 - [c50]Keita Emura, Takuya Hayashi, Noboru Kunihiro, Jun Sakuma:
Mis-operation Resistant Searchable Homomorphic Encryption. AsiaCCS 2017: 215-229 - [c49]Keita Emura, Takuya Hayashi, Ai Ishida:
Group Signatures with Time-bound Keys Revisited: A New Model and an Efficient Construction. AsiaCCS 2017: 777-788 - [c48]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: 432-449 - [c47]Kotoko Yamada, Nuttapong Attrapadung, Keita Emura, Goichiro Hanaoka, Keisuke Tanaka:
Generic Constructions for Fully Secure Revocable Attribute-Based Encryption. ESORICS (2) 2017: 532-551 - [c46]Keita Emura:
A Generic Construction of Secure-Channel Free Searchable Encryption with Multiple Keywords. NSS 2017: 3-18 - [c45]Hiromi Arai, Keita Emura, Takuya Hayashi:
A Framework of Privacy Preserving Anomaly Detection: Providing Traceability without Big Brother. WPES@CCS 2017: 111-122 - [i11]Keita Emura:
Privacy-Preserving Aggregation of Time-Series Data with Public Verifiability from Simple Assumptions. IACR Cryptol. ePrint Arch. 2017: 479 (2017) - 2016
- [j22]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. 99-A(1): 83-91 (2016) - [j21]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): 549-571 (2016) - [j20]Jae Hong Seo, Keita Emura:
Revocable hierarchical identity-based encryption via history-free approach. Theor. Comput. Sci. 615: 45-60 (2016) - [j19]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: 95-116 (2016) - [j18]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): 88-101 (2016) - [c44]Ai Ishida, Keita Emura, Goichiro Hanaoka, Yusuke Sakai, Keisuke Tanaka:
Group Signature with Deniability: How to Disavow a Signature. CANS 2016: 228-244 - [c43]Keita Emura, Takuya Hayashi, Shiho Moriai:
Toward securing tire pressure monitoring systems: A case of PRESENT-based implementation. ISITA 2016: 403-407 - [c42]Mohammad Shahriar Rahman, Keita Emura, Shinsaku Kiyomoto:
On the Leakage Resilient Cryptography in Game-Theoretic Settings. Trustcom/BigDataSE/ISPA 2016: 1984-1989 - [e2]Keita Emura, Goichiro Hanaoka, Rui Zhang:
Proceedings of the 3rd ACM International Workshop on ASIA Public-Key Cryptography, AsiaPKC@AsiaCCS, Xi'an, China, May 30 - June 03, 2016. ACM 2016, ISBN 978-1-4503-4286-5 [contents] - [i10]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: 477 (2016) - [i9]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: 1094 (2016) - 2015
- [j17]Nuttapong Attrapadung, Keita Emura, Goichiro Hanaoka, Yusuke Sakai:
Revocable Group Signature with Constant-Size Revocation List. Comput. J. 58(10): 2698-2715 (2015) - [j16]Ai Ishida, Keita Emura, Goichiro Hanaoka, Yusuke Sakai, Keisuke Tanaka:
Disavowable Public Key Encryption with Non-Interactive Opening. IEICE Trans. Fundam. Electron. Commun. Comput. Sci. 98-A(12): 2446-2455 (2015) - [j15]Jiageng Chen, Keita Emura, Atsuko Miyaji:
SKENO: Secret key encryption with non-interactive opening. J. Math. Cryptol. 9(2): 63-74 (2015) - [j14]Keita Emura, Atsuko Miyaji, Mohammad Shahriar Rahman, Kazumasa Omote:
Generic constructions of secure-channel free searchable encryption with adaptive security. Secur. Commun. Networks 8(8): 1547-1560 (2015) - [c41]Yusuke Sakai, Keita Emura, Jacob C. N. Schuldt, Goichiro Hanaoka, Kazuo Ohta:
Dynamic Threshold Public-Key Encryption with Decryption Consistency from Static Assumptions. ACISP 2015: 77-92 - [c40]Jae Hong Seo, Keita Emura, Keita Xagawa, Kazuki Yoneyama:
Accumulable Optimistic Fair Exchange from Verifiably Encrypted Homomorphic Signatures. ACNS 2015: 192-214 - [c39]Ai Ishida, Keita Emura, Goichiro Hanaoka, Yusuke Sakai, Keisuke Tanaka:
Disavowable Public Key Encryption with Non-interactive Opening. AsiaCCS 2015: 667 - [c38]Keita Emura, Akira Kanaoka, Satoshi Ohta, Takeshi Takahashi:
A KEM/DEM-Based Construction for Secure and Anonymous Communication. COMPSAC Workshops 2015: 680-681 - [c37]Jae Hong Seo, Keita Emura:
Revocable Hierarchical Identity-Based Encryption: History-Free Update, Security Against Insiders, and Short Ciphertexts. CT-RSA 2015: 106-123 - [c36]Jae Hong Seo, Keita Emura:
Adaptive-ID Secure Revocable Hierarchical Identity-Based Encryption. IWSEC 2015: 21-38 - [c35]Keita Emura, Takuya Hayashi:
A Light-Weight Group Signature Scheme with Time-Token Dependent Linking. LightSec 2015: 37-57 - [c34]Keita Emura, Le Trieu Phong, Yohei Watanabe:
Keyword Revocable Searchable Encryption with Trapdoor Exposure Resistance and Re-generateability. TrustCom/BigDataSE/ISPA (1) 2015: 167-174 - [i8]Ai Ishida, Keita Emura, Goichiro Hanaoka, Yusuke Sakai, Keisuke Tanaka:
Group Signature with Deniability: How to Disavow a Signature. IACR Cryptol. ePrint Arch. 2015: 43 (2015) - 2014
- [j13]Jae Hong Seo, Keita Emura:
Revocable Identity-Based Encryption with Rejoin Functionality. IEICE Trans. Fundam. Electron. Commun. Comput. Sci. 97-A(8): 1806-1809 (2014) - [j12]Keita Emura, Goichiro Hanaoka, Yusuke Sakai, Jacob C. N. Schuldt:
Group signature implies public-key encryption with non-interactive opening. Int. J. Inf. Sec. 13(1): 51-62 (2014) - [j11]Keita Emura, Atsuko Miyaji, Kazumasa Omote:
An r-Hiding Revocable Group Signature Scheme: Group Signatures with the Property of Hiding the Number of Revoked Users. J. Appl. Math. 2014: 983040:1-983040:14 (2014) - [j10]Jae Hong Seo, Keita Emura:
Revocable hierarchical identity-based encryption. Theor. Comput. Sci. 542: 44-62 (2014) - [j9]Jae Hong Seo, Keita Emura:
Revocable Identity-Based Cryptosystem Revisited: Security Models and Constructions. IEEE Trans. Inf. Forensics Secur. 9(7): 1193-1205 (2014) - [c33]Nuttapong Attrapadung, Keita Emura, Goichiro Hanaoka, Yusuke Sakai:
A Revocable Group Signature Scheme from Identity-Based Revocation Techniques: Achieving Constant-Size Revocation List. ACNS 2014: 419-437 - [c32]Hiromi Arai, Keita Emura, Takahiro Matsuda:
Anonymous Data Collection System with Mediators. BalkanCryptSec 2014: 141-160 - [c31]Keita Emura, Akira Kanaoka, Satoshi Ohta, Takeshi Takahashi:
Building secure and anonymous communication channel: formal model and its prototype implementation. SAC 2014: 1641-1648 - [c30]Sanami Nakagawa, Keita Emura, Goichiro Hanaoka, Akihisa Kodate, Takashi Nishide, Eiji Okamoto, Yusuke Sakai:
A Privacy-Enhanced Access Log Management Mechanism in SSO Systems from Nominative Signatures. TrustCom 2014: 565-574 - [c29]Dan Bogdanov, Keita Emura, Roman Jagomägis, Akira Kanaoka, Shin'ichiro Matsuo, Jan Willemson:
A Secure Genetic Algorithm for the Subset Cover Problem and Its Application to Privacy Protection. WISTP 2014: 108-123 - [e1]Keita Emura, Goichiro Hanaoka, Yunlei Zhao:
ASIAPKC'14, Proceedings of the 2nd ACM Wookshop on ASIA Public-Key Cryptography, June 3, 2014, Kyoto, Japan. ACM 2014, ISBN 978-1-4503-2801-2 [contents] - [i7]Keita Emura, Akira Kanaoka, Satoshi Ohta, Takeshi Takahashi:
Building Secure and Anonymous Communication Channel: Formal Model and its Prototype Implementation. CoRR abs/1403.7014 (2014) - [i6]Keita Emura, Takuya Hayashi:
Road-to-Vehicle Communications with Time-Dependent Anonymity: A Light Weight Construction and its Experimental Results. IACR Cryptol. ePrint Arch. 2014: 926 (2014) - 2013
- [j8]Yusuke Sakai, Keita Emura, Goichiro Hanaoka, Yutaka Kawai, Kazumasa Omote:
Methods for Restricting Message Space in Public-Key Encryption. IEICE Trans. Fundam. Electron. Commun. Comput. Sci. 96-A(6): 1156-1168 (2013) - [j7]Jae Hong Seo, Keita Emura:
A Remark on " Efficient Revocable ID-Based Encryption with a Public Channel". IEICE Trans. Fundam. Electron. Commun. Comput. Sci. 96-A(11): 2282-2285 (2013) - [j6]Jae Hong Seo, Keita Emura:
On Discrete Logarithm Based Additively Homomorphic Encryption. IEICE Trans. Fundam. Electron. Commun. Comput. Sci. 96-A(11): 2286-2289 (2013) - [c28]Takeshi Takahashi, Keita Emura, Akira Kanaoka, Shin'ichiro Matsuo, Tadashi Minowa:
Risk visualization and alerting system: architecture and proof-of-concept implementation. SESP@CCS Asia 2013: 3-10 - [c27]Kazuma Ohara, Yusuke Sakai, Keita Emura, Goichiro Hanaoka:
A group signature scheme with unbounded message-dependent opening. AsiaCCS 2013: 517-522 - [c26]Rahena Akhter, Rownak Jahan Chowdhury, Keita Emura, Tamzida Islam, Mohammad Shahriar Rahman, Nusrat Rubaiyat:
Privacy-Preserving Two-Party k-Means Clustering in Malicious Model. COMPSAC Workshops 2013: 121-126 - [c25]Jae Hong Seo, Keita Emura:
Efficient Delegation of Key Generation and Revocation Functionalities in Identity-Based Encryption. CT-RSA 2013: 343-358 - [c24]Keita Emura, Goichiro Hanaoka, Go Ohtake, Takahiro Matsuda, Shota Yamada:
Chosen Ciphertext Secure Keyed-Homomorphic Public-Key Encryption. Public Key Cryptography 2013: 32-50 - [c23]Jae Hong Seo, Keita Emura:
Revocable Identity-Based Encryption Revisited: Security Model and Construction. Public Key Cryptography 2013: 216-234 - [c22]Keita Emura, Atsuko Miyaji, Mohammad Shahriar Rahman:
Private Multiparty Set Intersection Protocol in Rational Model. TrustCom/ISPA/IUCC 2013: 431-438 - [i5]Jae Hong Seo, Keita Emura:
Revocable Identity-Based Encryption Revisited: Security Model and Construction. IACR Cryptol. ePrint Arch. 2013: 16 (2013) - [i4]Jae Hong Seo, Keita Emura:
Efficient Delegation of Key Generation and Revocation Functionalities in Identity-Based Encryption. IACR Cryptol. ePrint Arch. 2013: 18 (2013) - [i3]Keita Emura, Atsuko Miyaji, Mohammad Shahriar Rahman, Kazumasa Omote:
Generic Constructions of Secure-Channel Free Searchable Encryption with Adaptive Security. IACR Cryptol. ePrint Arch. 2013: 321 (2013) - [i2]Keita Emura, Goichiro Hanaoka, Koji Nuida, Go Ohtake, Takahiro Matsuda, Shota Yamada:
Chosen Ciphertext Secure Keyed-Homomorphic Public-Key Encryption. IACR Cryptol. ePrint Arch. 2013: 390 (2013) - 2012
- [j5]Keita Emura, Atsuko Miyaji, Mohammad Shahriar Rahman:
Dynamic attribute-based signcryption without random oracles. Int. J. Appl. Cryptogr. 2(3): 199-211 (2012) - [c21]Tatsuro Iida, Keita Emura, Atsuko Miyaji, Kazumasa Omote:
An Intrusion and Random-Number-Leakage Resilient Scheme in Mobile Unattended WSNs. AINA Workshops 2012: 552-557 - [c20]Yusuke Sakai, Keita Emura, Goichiro Hanaoka, Yutaka Kawai, Takahiro Matsuda, Kazumasa Omote:
Group Signatures with Message-Dependent Opening. Pairing 2012: 270-294 - [c19]Yusuke Sakai, Jacob C. N. Schuldt, Keita Emura, Goichiro Hanaoka, Kazuo Ohta:
On the Security of Dynamic Group Signatures: Preventing Signature Hijacking. Public Key Cryptography 2012: 715-732 - [c18]Kohei Kasamatsu, Takahiro Matsuda, Keita Emura, Nuttapong Attrapadung, Goichiro Hanaoka, Hideki Imai:
Time-Specific Encryption from Forward-Secure Encryption. SCN 2012: 184-204 - [c17]Keita Emura, Mohammad Shahriar Rahman:
Constructing Secure-channel Free Searchable Encryption from Anonymous IBE with Partitioned Ciphertext Structure. SECRYPT 2012: 84-93 - [c16]Keita Emura, Takashi Sato:
Flexible Group Key Exchange with On-demand Computation of Subgroup Keys Supporting Subgroup Key Randomization. SECRYPT 2012: 353-357 - [i1]Yusuke Sakai, Jacob C. N. Schuldt, Keita Emura, Goichiro Hanaoka, Kazuo Ohta:
On the Security of Dynamic Group Signatures: Preventing Signature Hijacking. IACR Cryptol. ePrint Arch. 2012: 431 (2012) - 2011
- [j4]Keita Emura, Atsuko Miyaji, Kazumasa Omote:
A Timed-Release Proxy Re-Encryption Scheme. IEICE Trans. Fundam. Electron. Commun. Comput. Sci. 94-A(8): 1682-1695 (2011) - [c15]Keita Emura, Atsuko Miyaji, Mohammad Shahriar Rahman:
Toward Dynamic Attribute-Based Signcryption (Poster). ACISP 2011: 439-443 - [c14]Jiageng Chen, Keita Emura, Atsuko Miyaji:
Non-interactive Opening for Ciphertexts Encrypted by Shared Keys. ICICS 2011: 57-68 - [c13]Keita Emura, Atsuko Miyaji, Akito Nomura, Mohammad Shahriar Rahman, Masakazu Soshi:
Ideal Secret Sharing Schemes with Share Selectability. ICICS 2011: 143-157 - [c12]Keita Emura, Atsuko Miyaji, Kazumasa Omote:
A Revocable Group Signature Scheme with the Property of Hiding the Number of Revoked Users. ICISC 2011: 186-203 - [c11]Keita Emura, Atsuko Miyaji, Kazumasa Omote:
Adaptive Secure-Channel Free Public-Key Encryption with Keyword Search Implies Timed Release Encryption. ISC 2011: 102-118 - [c10]Yusuke Sakai, Keita Emura, Goichiro Hanaoka, Yutaka Kawai, Kazumasa Omote:
Towards Restricting Plaintext Space in Public Key Encryption. IWSEC 2011: 193-209 - 2010
- [j3]Keita Emura, Atsuko Miyaji, Kazumasa Omote, Akito Nomura, Masakazu Soshi:
A ciphertext-policy attribute-based encryption scheme with constant ciphertext length. Int. J. Appl. Cryptogr. 2(1): 46-59 (2010) - [c9]Keita Emura, Atsuko Miyaji, Mohammad Shahriar Rahman:
Efficient Privacy-Preserving Data Mining in Malicious Model. ADMA (1) 2010: 370-382 - [c8]Keita Emura, Atsuko Miyaji, Kazumasa Omote:
An Identity-Based Proxy Re-Encryption Scheme with Source Hiding Property, and its Application to a Mailing-List System. EuroPKI 2010: 77-92 - [c7]Keita Emura, Goichiro Hanaoka, Yusuke Sakai:
Group Signature Implies PKE with Non-interactive Opening and Threshold PKE. IWSEC 2010: 181-198 - [c6]Keita Emura, Atsuko Miyaji, Kazumasa Omote:
An Anonymous Designated Verifier Signature Scheme with Revocation: How to Protect a Company's Reputation. ProvSec 2010: 184-198 - [c5]Keita Emura, Atsuko Miyaji, Kazumasa Omote:
A Timed-Release Proxy Re-encryption Scheme and Its Application to Fairly-Opened Multicast Communication. ProvSec 2010: 200-213
2000 – 2009
- 2009
- [j2]Keita Emura, Atsuko Miyaji, Kazumasa Omote:
A Dynamic Attribute-Based Group Signature Scheme and Its Application in an Anonymous Survey for the Collection of Attribute Statistics. Inf. Media Technol. 4(4): 1060-1075 (2009) - [j1]Keita Emura, Atsuko Miyaji, Kazumasa Omote:
A Dynamic Attribute-Based Group Signature Scheme and Its Application in an Anonymous Survey for the Collection of Attribute Statistics. J. Inf. Process. 17: 216-231 (2009) - [c4]Keita Emura, Atsuko Miyaji, Kazumasa Omote:
A Dynamic Attribute-Based Group Signature Scheme and its Application in an Anonymous Survey for the Collection of Attribute Statistics. ARES 2009: 487-492 - [c3]Keita Emura, Atsuko Miyaji, Kazumasa Omote:
A Certificate Revocable Anonymous Authentication Scheme with Designated Verifier. ARES 2009: 769-773 - [c2]Keita Emura, Atsuko Miyaji, Akito Nomura, Kazumasa Omote, Masakazu Soshi:
A Ciphertext-Policy Attribute-Based Encryption Scheme with Constant Ciphertext Length. ISPEC 2009: 13-23 - [c1]Keita Emura, Atsuko Miyaji, Kazumasa Omote:
A Selectable k-Times Relaxed Anonymous Authentication Scheme. WISA 2009: 281-295
Coauthor Index
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