Keita Emura

According to our database, Keita Emura authored at least 127 papers between 2009 and 2024.

Collaborative distances:

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

2024

Generic Construction of Public-Key Authenticated Encryption with Keyword Search Revisited.

Keita Emura

IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2024

More Efficient Adaptively Secure Lattice-Based IBE with Equality Test in the Standard Model.

Kyoichi Asano, Keita Emura, Atsushi Takayasu

IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2024

Attribute-based Keyed (Fully) Homomorphic Encryption.

Keita Emura, Shingo Sato, Atsushi Takayasu

IACR Cryptol. ePrint Arch., 2024

2023

Can Sleep Apnea Be Detected from Human Pulse Waveform with Laplace Noise?

Itaru Kaneko, Le Trieu Phong, Keita Emura, Emi Yuda

J. Adv. Comput. Intell. Intell. Informatics, September, 2023

A Generic Construction of CCA-Secure Identity-Based Encryption with Equality Test against Insider Attacks.

Keita Emura, Atsushi Takayasu

IEICE Trans. Fundam. Electron. Commun. Comput. Sci., March, 2023

A Deeper Look into Deep Learning-based Output Prediction Attacks Using Weak SPN Block Ciphers.

Hayato Kimura, Keita Emura, Takanori Isobe, Ryoma Ito, Kazuto Ogawa, Toshihiro Ohigashi

J. Inf. Process., 2023

Outsider-Anonymous Broadcast Encryption with Keyword Search: Generic Construction, CCA Security, and with Sublinear Ciphertexts.

Keita Emura, Kaisei Kajita, Go Ohtake

IACR Cryptol. ePrint Arch., 2023

On the Feasibility of Identity-based Encryption with Equality Test against Insider Attacks.

Keita Emura

IACR Cryptol. ePrint Arch., 2023

Generic Construction of Dual-Server Public Key Authenticated Encryption with Keyword Search.

Keita Emura

IACR Cryptol. ePrint Arch., 2023

Generic Construction of Forward Secure Public Key Authenticated Encryption with Keyword Search.

Keita Emura

IACR Cryptol. ePrint Arch., 2023

Generic Construction of Broadcast Authenticated Encryption with Keyword Search.

Keita Emura

IACR Cryptol. ePrint Arch., 2023

An Anonymous yet Accountable Contract Wallet System using Account Abstraction.

Kota Chin, Keita Emura, Kazumasa Omote

CoRR, 2023

Cybersecurity-Enhanced Encrypted Control System Using Keyed-Homomorphic Public Key Encryption.

Masaki Miyamoto, Kaoru Teranishi, Keita Emura, Kiminao Kogiso

IEEE Access, 2023

An End-to-End Encrypted Cache System with Time-Dependent Access Control.

Keita Emura, Masato Yoshimi

Proceedings of the 9th International Conference on Information Systems Security and Privacy, 2023

2022

Identity-based encryption with security against the KGC: A formal model and its instantiations.

Keita Emura, Shuichi Katsumata, Yohei Watanabe

Theor. Comput. Sci., 2022

Privacy-Preserving Federated Learning for Detecting Fraudulent Financial Transactions in Japanese Banks.

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

J. Inf. Process., 2022

Keyed-Fully Homomorphic Encryption without Indistinguishability Obfuscation.

Shingo Sato, Keita Emura, Atsushi Takayasu

IACR Cryptol. ePrint Arch., 2022

Continuous Group Key Agreement with Flexible Authorization and Its Applications.

Kaisei Kajita, Keita Emura, Kazuto Ogawa, Ryo Nojima, Go Ohtake

IACR Cryptol. ePrint Arch., 2022

Cache-22: A Highly Deployable End-To-End Encrypted Cache System with Post-Quantum Security.

Keita Emura, Shiho Moriai, Takuma Nakajima, Masato Yoshimi

IACR Cryptol. ePrint Arch., 2022

Membership Privacy for Asynchronous Group Messaging.

Keita Emura, Kaisei Kajita, Ryo Nojima, Kazuto Ogawa, Go Ohtake

IACR Cryptol. ePrint Arch., 2022

Generic Construction of Public-key Authenticated Encryption with Keyword Search Revisited: Stronger Security and Efficient Construction.

Keita Emura

IACR Cryptol. ePrint Arch., 2022

A Sealed-bid Auction with Fund Binding: Preventing Maximum Bidding Price Leakage.

Kota Chin, Keita Emura, Kazumasa Omote, Shingo Sato

Proceedings of the IEEE International Conference on Blockchain, 2022

Output Prediction Attacks on Block Ciphers Using Deep Learning.

Hayato Kimura, Keita Emura, Takanori Isobe, Ryoma Ito, Kazuto Ogawa, Toshihiro Ohigashi

Proceedings of the Applied Cryptography and Network Security Workshops, 2022

2021

Efficient revocable identity-based encryption with short public parameters.

Keita Emura, Jae Hong Seo, Yohei Watanabe

Theor. Comput. Sci., 2021

On the Security of Keyed-Homomorphic PKE: Preventing Key Recovery Attacks and Ciphertext Validity Attacks.

Keita Emura

IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2021

Privacy-Preserving Data Analysis: Providing Traceability without Big Brother.

Hiromi Arai, Keita Emura, Takuya Hayashi

IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2021

Fully Anonymous Group Signature with Verifier-Local Revocation.

Ai Kitagawa, Yusuke Sakai, Keita Emura, Goichiro Hanaoka, Keisuke Tanaka

IACR Cryptol. ePrint Arch., 2021

Generic Constructions of Revocable Hierarchical Identity-based Encryption.

Keita Emura, Atsushi Takayasu, Yohei Watanabe

IACR Cryptol. ePrint Arch., 2021

State-free End-to-End Encrypted Storage and Chat Systems based on Searchable Encryption.

Keita Emura, Ryoma Ito, Sachiko Kanamori, Ryo Nojima, Yohei Watanabe

IACR Cryptol. ePrint Arch., 2021

A Generic Construction of CCA-secure Attribute-based Encryption with Equality Test.

Kyoichi Asano, Keita Emura, Atsushi Takayasu, Yohei Watanabe

IACR Cryptol. ePrint Arch., 2021

Output Prediction Attacks on SPN Block Ciphers using Deep Learning.

Hayato Kimura, Keita Emura, Takanori Isobe, Ryoma Ito, Kazuto Ogawa, Toshihiro Ohigashi

IACR Cryptol. ePrint Arch., 2021

Efficient identity-based encryption with Hierarchical key-insulation from HIBE.

Keita Emura, Atsushi Takayasu, Yohei Watanabe

Des. Codes Cryptogr., 2021

Adaptively secure revocable hierarchical IBE from k-linear assumption.

Keita Emura, Atsushi Takayasu, Yohei Watanabe

Des. Codes Cryptogr., 2021

An Anonymous Trust-Marking Scheme on Blockchain Systems.

Teppei Sato, Keita Emura, Tomoki Fujitani, Kazumasa Omote

IEEE Access, 2021

Implementation and Evaluation of an Identity-Based Encryption with Security Against the KGC.

Shuntaro Ema, Yuta Sato, Keita Emura, Toshihiro Ohigashi

Proceedings of the Ninth International Symposium on Computing and Networking, 2021

A Privacy-Preserving Enforced Bill Collection System using Smart Contracts.

Tomoki Fujitani, Keita Emura, Kazumasa Omote

Proceedings of the 16th Asia Joint Conference on Information Security, 2021

2020

Group Signatures with Time-Bound Keys Revisited: A New Model, an Efficient Construction, and its Implementation.

Keita Emura, Takuya Hayashi, Ai Ishida

IEEE Trans. Dependable Secur. Comput., 2020

Secure-channel free searchable encryption with multiple keywords: A generic construction, an instantiation, and its implementation.

Keita Emura, Katsuhiko Ito, Toshihiro Ohigashi

J. Comput. Syst. Sci., 2020

Implementation of a Strongly Robust Identity-Based Encryption Scheme over Type-3 Pairings.

Hiroshi Okano, Keita Emura, Takuya Ishibashi, Toshihiro Ohigashi, Tatsuya Suzuki

Int. J. Netw. Comput., 2020

A Revocable Group Signature Scheme with Scalability from Simple Assumptions.

Keita Emura, Takuya Hayashi

IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2020

Verifiable Functional Encryption using Intel SGX.

Tatsuya Suzuki, Keita Emura, Toshihiro Ohigashi, Kazumasa Omote

IACR Cryptol. ePrint Arch., 2020

Cache-22: A Highly Deployable Encrypted Cache System.

Keita Emura, Shiho Moriai, Takuma Nakajima, Masato Yoshimi

Proceedings of the International Symposium on Information Theory and Its Applications, 2020

2019

Group Signatures with Message-Dependent Opening: Formal Definitions and Constructions.

Keita Emura, Goichiro Hanaoka, Yutaka Kawai, Takahiro Matsuda, Kazuma Ohara, Kazumasa Omote, Yusuke Sakai

Secur. Commun. Networks, 2019

A Generic Construction of Integrated Secure-Channel Free PEKS and PKE and its Application to EMRs in Cloud Storage.

Tatsuya Suzuki, Keita Emura, Toshihiro Ohigashi

J. Medical Syst., 2019

Shortening the Libert-Peters-Yung Revocable Group Signature Scheme by Using the Random Oracle Methodology.

Kazuma Ohara, Keita Emura, Goichiro Hanaoka, Ai Ishida, Kazuo Ohta, Yusuke Sakai

IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2019

Proper Usage of the Group Signature Scheme in ISO/IEC 20008-2.

Ai Ishida, Yusuke Sakai, Keita Emura, Goichiro Hanaoka, Keisuke Tanaka

IACR Cryptol. ePrint Arch., 2019

A Revocable Group Signature Scheme with Scalability from Simple Assumptions and Its Application to Identity Management.

Keita Emura, Takuya Hayashi

IACR Cryptol. ePrint Arch., 2019

Privacy-Preserving Aggregation of Time-Series Data with Public Verifiability from Simple Assumptions and Its Implementations.

Keita Emura, Hayato Kimura, Toshihiro Ohigashi, Tatsuya Suzuki

Comput. J., 2019

Identity-Based Encryption with Security Against the KGC: A Formal Model and Its Instantiation from Lattices.

Keita Emura, Shuichi Katsumata, Yohei Watanabe

Proceedings of the Computer Security - ESORICS 2019, 2019

Session details: Invited Talk.

Keita Emura

Proceedings of the 6th on ASIA Public-Key Cryptography Workshop, 2019

2018

Road-to-Vehicle Communications With Time-Dependent Anonymity: A Lightweight Construction and Its Experimental Results.

Keita Emura, Takuya Hayashi

IEEE Trans. Veh. Technol., 2018

Accumulable optimistic fair exchange from verifiably encrypted homomorphic signatures.

Jae Hong Seo, Keita Emura, Keita Xagawa, Kazuki Yoneyama

Int. J. Inf. Sec., 2018

Generic Constructions for Fully Secure Revocable Attribute-Based Encryption.

Kotoko Yamada, Nuttapong Attrapadung, Keita Emura, Goichiro Hanaoka, Keisuke Tanaka

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

Chosen ciphertext secure keyed-homomorphic public-key cryptosystems.

Keita Emura, Goichiro Hanaoka, Koji Nuida, Go Ohtake, Takahiro Matsuda, Shota Yamada

Des. Codes Cryptogr., 2018

Fully Anonymous Group Signature with Verifier-Local Revocation.

Ai Ishida, Yusuke Sakai, Keita Emura, Goichiro Hanaoka, Keisuke Tanaka

Proceedings of the Security and Cryptography for Networks - 11th International Conference, 2018

A Revocable Group Signature Scheme with Scalability from Simple Assumptions and Its Implementation.

Keita Emura, Takuya Hayashi

Proceedings of the Information Security - 21st International Conference, 2018

A Generic Construction of Integrated Secure-Channel Free PEKS and PKE.

Tatsuya Suzuki, Keita Emura, Toshihiro Ohigashi

Proceedings of the Information Security Practice and Experience, 2018

2017

Establishing secure and anonymous communication channel: KEM/DEM-based construction and its implementation.

Keita Emura, Akira Kanaoka, Satoshi Ohta, Takeshi Takahashi

J. Inf. Secur. Appl., 2017

A privacy-enhanced access log management mechanism in SSO systems from nominative signatures.

Sanami Nakagawa, Takashi Nishide, Eiji Okamoto, Keita Emura, Goichiro Hanaoka, Yusuke Sakai, Akihisa Kodate

Int. J. Appl. Cryptogr., 2017

Group Signature with Deniability: How to Disavow a Signature.

Ai Ishida, Keita Emura, Goichiro Hanaoka, Yusuke Sakai, Keisuke Tanaka

IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2017

Privacy-Preserving Aggregation of Time-Series Data with Public Verifiability from Simple Assumptions.

Keita Emura

IACR Cryptol. ePrint Arch., 2017

A Framework of Privacy Preserving Anomaly Detection: Providing Traceability without Big Brother.

Hiromi Arai, Keita Emura, Takuya Hayashi

Proceedings of the 2017 on Workshop on Privacy in the Electronic Society, Dallas, TX, USA, October 30, 2017

A Generic Construction of Secure-Channel Free Searchable Encryption with Multiple Keywords.

Keita Emura

Proceedings of the Network and System Security - 11th International Conference, 2017

Mis-operation Resistant Searchable Homomorphic Encryption.

Keita Emura, Takuya Hayashi, Noboru Kunihiro, Jun Sakuma

Proceedings of the 2017 ACM on Asia Conference on Computer and Communications Security, 2017

Group Signatures with Time-bound Keys Revisited: A New Model and an Efficient Construction.

Keita Emura, Takuya Hayashi, Ai Ishida

Proceedings of the 2017 ACM on Asia Conference on Computer and Communications Security, 2017

2016

Secure and Anonymous Communication Technique: Formal Model and Its Prototype Implementation.

Keita Emura, Akira Kanaoka, Satoshi Ohta, Kazumasa Omote, Takeshi Takahashi

IEEE Trans. Emerg. Top. Comput., 2016

Revocable hierarchical identity-based encryption via history-free approach.

Jae Hong Seo, Keita Emura

Theor. Comput. Sci., 2016

Constructions of dynamic and non-dynamic threshold public-key encryption schemes with decryption consistency.

Yusuke Sakai, Keita Emura, Jacob C. N. Schuldt, Goichiro Hanaoka, Kazuo Ohta

Theor. Comput. Sci., 2016

Time-specific encryption from forward-secure encryption: generic and direct constructions.

Kohei Kasamatsu, Takahiro Matsuda, Keita Emura, Nuttapong Attrapadung, Goichiro Hanaoka, Hideki Imai

Int. J. Inf. Sec., 2016

Semi-Generic Transformation of Revocable Hierarchical Identity-Based Encryption and Its DBDH Instantiation.

Keita Emura, Jae Hong Seo, Taek-Young Youn

IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2016

New Revocable IBE in Prime-Order Groups: Adaptively Secure, Decryption Key Exposure Resistant, and with Short Public Parameters.

Yohei Watanabe, Keita Emura, Jae Hong Seo

IACR Cryptol. ePrint Arch., 2016

On the Leakage Resilient Cryptography in Game-Theoretic Settings.

Mohammad Shahriar Rahman, Keita Emura, Shinsaku Kiyomoto

Proceedings of the 2016 IEEE Trustcom/BigDataSE/ISPA, 2016

Toward securing tire pressure monitoring systems: A case of PRESENT-based implementation.

Keita Emura, Takuya Hayashi, Shiho Moriai

Proceedings of the 2016 International Symposium on Information Theory and Its Applications, 2016

2015

Generic constructions of secure-channel free searchable encryption with adaptive security.

Keita Emura, Atsuko Miyaji, Mohammad Shahriar Rahman, Kazumasa Omote

Secur. Commun. Networks, 2015

SKENO: Secret key encryption with non-interactive opening.

Jiageng Chen, Keita Emura, Atsuko Miyaji

J. Math. Cryptol., 2015

Disavowable Public Key Encryption with Non-Interactive Opening.

Ai Ishida, Keita Emura, Goichiro Hanaoka, Yusuke Sakai, Keisuke Tanaka

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

Revocable Group Signature with Constant-Size Revocation List.

Nuttapong Attrapadung, Keita Emura, Goichiro Hanaoka, Yusuke Sakai

Comput. J., 2015

Keyword Revocable Searchable Encryption with Trapdoor Exposure Resistance and Re-generateability.

Keita Emura, Le Trieu Phong, Yohei Watanabe

Proceedings of the 2015 IEEE TrustCom/BigDataSE/ISPA, 2015

A Light-Weight Group Signature Scheme with Time-Token Dependent Linking.

Keita Emura, Takuya Hayashi

Proceedings of the Lightweight Cryptography for Security and Privacy, 2015

Adaptive-ID Secure Revocable Hierarchical Identity-Based Encryption.

Jae Hong Seo, Keita Emura

Proceedings of the Advances in Information and Computer Security, 2015

Revocable Hierarchical Identity-Based Encryption: History-Free Update, Security Against Insiders, and Short Ciphertexts.

Jae Hong Seo, Keita Emura

Proceedings of the Topics in Cryptology, 2015

A KEM/DEM-Based Construction for Secure and Anonymous Communication.

Keita Emura, Akira Kanaoka, Satoshi Ohta, Takeshi Takahashi

Proceedings of the 39th Annual Computer Software and Applications Conference, 2015

Dynamic Threshold Public-Key Encryption with Decryption Consistency from Static Assumptions.

Yusuke Sakai, Keita Emura, Jacob C. N. Schuldt, Goichiro Hanaoka, Kazuo Ohta

Proceedings of the Information Security and Privacy - 20th Australasian Conference, 2015

2014

Revocable Identity-Based Cryptosystem Revisited: Security Models and Constructions.

Jae Hong Seo, Keita Emura

IEEE Trans. Inf. Forensics Secur., 2014

Revocable hierarchical identity-based encryption.

Jae Hong Seo, Keita Emura

Theor. Comput. Sci., 2014

An r-Hiding Revocable Group Signature Scheme: Group Signatures with the Property of Hiding the Number of Revoked Users.

Keita Emura, Atsuko Miyaji, Kazumasa Omote

J. Appl. Math., 2014

Group signature implies public-key encryption with non-interactive opening.

Keita Emura, Goichiro Hanaoka, Yusuke Sakai, Jacob C. N. Schuldt

Int. J. Inf. Sec., 2014

Revocable Identity-Based Encryption with Rejoin Functionality.

Jae Hong Seo, Keita Emura

IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2014

Road-to-Vehicle Communications with Time-Dependent Anonymity: A Light Weight Construction and its Experimental Results.

Keita Emura, Takuya Hayashi

IACR Cryptol. ePrint Arch., 2014

A Secure Genetic Algorithm for the Subset Cover Problem and Its Application to Privacy Protection.

Dan Bogdanov, Keita Emura, Roman Jagomägis, Akira Kanaoka, Shin'ichiro Matsuo, Jan Willemson

Proceedings of the Information Security Theory and Practice. Securing the Internet of Things, 2014

Building secure and anonymous communication channel: formal model and its prototype implementation.

Keita Emura, Akira Kanaoka, Satoshi Ohta, Takeshi Takahashi

Proceedings of the Symposium on Applied Computing, 2014

Anonymous Data Collection System with Mediators.

Hiromi Arai, Keita Emura, Takahiro Matsuda

Proceedings of the Cryptography and Information Security in the Balkans, 2014

A Revocable Group Signature Scheme from Identity-Based Revocation Techniques: Achieving Constant-Size Revocation List.

Nuttapong Attrapadung, Keita Emura, Goichiro Hanaoka, Yusuke Sakai

Proceedings of the Applied Cryptography and Network Security, 2014

2013

On Discrete Logarithm Based Additively Homomorphic Encryption.

Jae Hong Seo, Keita Emura

IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2013

A Remark on " Efficient Revocable ID-Based Encryption with a Public Channel".

Jae Hong Seo, Keita Emura

IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2013

Methods for Restricting Message Space in Public-Key Encryption.

Yusuke Sakai, Keita Emura, Goichiro Hanaoka, Yutaka Kawai, Kazumasa Omote

IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2013

Efficient Delegation of Key Generation and Revocation Functionalities in Identity-Based Encryption.

Jae Hong Seo, Keita Emura

IACR Cryptol. ePrint Arch., 2013

Revocable Identity-Based Encryption Revisited: Security Model and Construction.

Jae Hong Seo, Keita Emura

IACR Cryptol. ePrint Arch., 2013

Chosen Ciphertext Secure Keyed-Homomorphic Public-Key Encryption.

Keita Emura, Goichiro Hanaoka, Koji Nuida, Go Ohtake, Takahiro Matsuda, Shota Yamada

IACR Cryptol. ePrint Arch., 2013

Private Multiparty Set Intersection Protocol in Rational Model.

Keita Emura, Atsuko Miyaji, Mohammad Shahriar Rahman

Proceedings of the 12th IEEE International Conference on Trust, 2013

Chosen Ciphertext Secure Keyed-Homomorphic Public-Key Encryption.

Keita Emura, Goichiro Hanaoka, Go Ohtake, Takahiro Matsuda, Shota Yamada

Proceedings of the Public-Key Cryptography - PKC 2013 - 16th International Conference on Practice and Theory in Public-Key Cryptography, Nara, Japan, February 26, 2013

Privacy-Preserving Two-Party k-Means Clustering in Malicious Model.

Rahena Akhter, Rownak Jahan Chowdhury, Keita Emura, Tamzida Islam, Mohammad Shahriar Rahman, Nusrat Rubaiyat

Proceedings of the IEEE 37th Annual Computer Software and Applications Conference, 2013

Risk visualization and alerting system: architecture and proof-of-concept implementation.

Takeshi Takahashi, Keita Emura, Akira Kanaoka, Shin'ichiro Matsuo, Tadashi Minowa

Proceedings of the first international workshop on Security in embedded systems and smartphones, 2013

A group signature scheme with unbounded message-dependent opening.

Kazuma Ohara, Yusuke Sakai, Keita Emura, Goichiro Hanaoka

Proceedings of the 8th ACM Symposium on Information, Computer and Communications Security, 2013

2012

Dynamic attribute-based signcryption without random oracles.

Keita Emura, Atsuko Miyaji, Mohammad Shahriar Rahman

Int. J. Appl. Cryptogr., 2012

On the Security of Dynamic Group Signatures: Preventing Signature Hijacking.

Yusuke Sakai, Jacob C. N. Schuldt, Keita Emura, Goichiro Hanaoka, Kazuo Ohta

IACR Cryptol. ePrint Arch., 2012

Flexible Group Key Exchange with On-demand Computation of Subgroup Keys Supporting Subgroup Key Randomization.

Keita Emura, Takashi Sato

Proceedings of the SECRYPT 2012, 2012

Constructing Secure-channel Free Searchable Encryption from Anonymous IBE with Partitioned Ciphertext Structure.

Keita Emura, Mohammad Shahriar Rahman

Proceedings of the SECRYPT 2012, 2012

Time-Specific Encryption from Forward-Secure Encryption.

Kohei Kasamatsu, Takahiro Matsuda, Keita Emura, Nuttapong Attrapadung, Goichiro Hanaoka, Hideki Imai

Proceedings of the Security and Cryptography for Networks - 8th International Conference, 2012

Group Signatures with Message-Dependent Opening.

Yusuke Sakai, Keita Emura, Goichiro Hanaoka, Yutaka Kawai, Takahiro Matsuda, Kazumasa Omote

Proceedings of the Pairing-Based Cryptography - Pairing 2012, 2012

An Intrusion and Random-Number-Leakage Resilient Scheme in Mobile Unattended WSNs.

Tatsuro Iida, Keita Emura, Atsuko Miyaji, Kazumasa Omote

Proceedings of the 26th International Conference on Advanced Information Networking and Applications Workshops, 2012

2011

A Timed-Release Proxy Re-Encryption Scheme.

Keita Emura, Atsuko Miyaji, Kazumasa Omote

IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2011

Towards Restricting Plaintext Space in Public Key Encryption.

Yusuke Sakai, Keita Emura, Goichiro Hanaoka, Yutaka Kawai, Kazumasa Omote

Proceedings of the Advances in Information and Computer Security, 2011

Adaptive Secure-Channel Free Public-Key Encryption with Keyword Search Implies Timed Release Encryption.

Keita Emura, Atsuko Miyaji, Kazumasa Omote

Proceedings of the Information Security, 14th International Conference, 2011

A Revocable Group Signature Scheme with the Property of Hiding the Number of Revoked Users.

Keita Emura, Atsuko Miyaji, Kazumasa Omote

Proceedings of the Information Security and Cryptology - ICISC 2011 - 14th International Conference, Seoul, Korea, November 30, 2011

Ideal Secret Sharing Schemes with Share Selectability.

Keita Emura, Atsuko Miyaji, Akito Nomura, Mohammad Shahriar Rahman, Masakazu Soshi

Proceedings of the Information and Communications Security - 13th International Conference, 2011

Non-interactive Opening for Ciphertexts Encrypted by Shared Keys.

Jiageng Chen, Keita Emura, Atsuko Miyaji

Proceedings of the Information and Communications Security - 13th International Conference, 2011

Toward Dynamic Attribute-Based Signcryption (Poster).

Keita Emura, Atsuko Miyaji, Mohammad Shahriar Rahman

Proceedings of the Information Security and Privacy - 16th Australasian Conference, 2011

2010

A ciphertext-policy attribute-based encryption scheme with constant ciphertext length.

Keita Emura, Atsuko Miyaji, Kazumasa Omote, Akito Nomura, Masakazu Soshi

Int. J. Appl. Cryptogr., 2010

A Timed-Release Proxy Re-encryption Scheme and Its Application to Fairly-Opened Multicast Communication.

Keita Emura, Atsuko Miyaji, Kazumasa Omote

Proceedings of the Provable Security - 4th International Conference, 2010

An Anonymous Designated Verifier Signature Scheme with Revocation: How to Protect a Company's Reputation.

Keita Emura, Atsuko Miyaji, Kazumasa Omote

Proceedings of the Provable Security - 4th International Conference, 2010

Group Signature Implies PKE with Non-interactive Opening and Threshold PKE.

Keita Emura, Goichiro Hanaoka, Yusuke Sakai

Proceedings of the Advances in Information and Computer Security, 2010

An Identity-Based Proxy Re-Encryption Scheme with Source Hiding Property, and its Application to a Mailing-List System.

Keita Emura, Atsuko Miyaji, Kazumasa Omote

Proceedings of the Public Key Infrastructures, Services and Applications, 2010

Efficient Privacy-Preserving Data Mining in Malicious Model.

Keita Emura, Atsuko Miyaji, Mohammad Shahriar Rahman

Proceedings of the Advanced Data Mining and Applications - 6th International Conference, 2010

2009

A Dynamic Attribute-Based Group Signature Scheme and Its Application in an Anonymous Survey for the Collection of Attribute Statistics.

Keita Emura, Atsuko Miyaji, Kazumasa Omote

J. Inf. Process., 2009

A Selectable <i>k</i>-Times Relaxed Anonymous Authentication Scheme.

Keita Emura, Atsuko Miyaji, Kazumasa Omote

Proceedings of the Information Security Applications, 10th International Workshop, 2009

A Certificate Revocable Anonymous Authentication Scheme with Designated Verifier.

Keita Emura, Atsuko Miyaji, Kazumasa Omote

Proceedings of the The Forth International Conference on Availability, 2009