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Your search keyword '"Keita Emura"' showing total 12 results
Start Over Author "Keita Emura" Publisher institute of electronics, information and communications engineers (ieice)
12 results on '"Keita Emura"'

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

Author

Hiromi Arai, Takuya Hayashi, and Keita Emura

Subjects
Privacy preserving, Traceability, Computer science, business.industry, Applied Mathematics, Signal Processing, Internet privacy, Electrical and Electronic Engineering, business, Computer Graphics and Computer-Aided Design, Brother
Published
2021

6. Generic Constructions for Fully Secure Revocable Attribute-Based Encryption

Author

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

Subjects
0301 basic medicine, Cryptographic primitive, Theoretical computer science, Revocation, business.industry, Computer science, Applied Mathematics, Access control, Cryptography, Data_CODINGANDINFORMATIONTHEORY, 02 engineering and technology, Encryption, Computer Graphics and Computer-Aided Design, 03 medical and health sciences, 030104 developmental biology, Probabilistic encryption, Signal Processing, Ciphertext, 0202 electrical engineering, electronic engineering, information engineering, Key (cryptography), 020201 artificial intelligence & image processing, Attribute-based encryption, Electrical and Electronic Engineering, business
Abstract

Attribute-based encryption (ABE) is a cryptographic primitive that realizes fine-grained access control. Due to its attractive functionality, several systems based on ABE have been widely constructed so far. In such cryptographic systems, revocation functionality is indispensable in practice to handle withdrawal of users, secret key exposure, and others. While many ABE schemes with various functionalities have been proposed, only a few of these are revocable ABE (RABE). In this paper, we propose two generic constructions of RABE from ABE. Our first construction employs the pair encoding framework (Attrapadung, EUROCRYPT 2014), and combines identity-based revocation and ABE via the generic conjunctive conversion of Attrapadung and Yamada (CT-RSA 2015). Our second construction directly converts ABE to RABE when ABE supports Boolean formulae. Since our constructions preserve functionalities of the underlying ABE, we can instantiate various fully secure RABE schemes for the first time, e.g., supporting regular languages, with unbounded attribute size and policy structure, and with constant-size ciphertext and secret key.

Published
2018

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

Author

Jae Hong Seo, Keita Emura, and Taek-Young Youn

Subjects
business.industry, Computer science, Applied Mathematics, 0102 computer and information sciences, 02 engineering and technology, Computer security, computer.software_genre, Encryption, 01 natural sciences, Computer Graphics and Computer-Aided Design, Transformation (function), 010201 computation theory & mathematics, Signal Processing, 0202 electrical engineering, electronic engineering, information engineering, Identity (object-oriented programming), 020201 artificial intelligence & image processing, Electrical and Electronic Engineering, business, computer
Published
2016

8. Revocable Identity-Based Encryption with Rejoin Functionality

Author

Jae Hong Seo and Keita Emura

Subjects
business.industry, Computer science, Applied Mathematics, Identity (philosophy), media_common.quotation_subject, Signal Processing, Internet privacy, Scalability, Electrical and Electronic Engineering, Encryption, business, Computer Graphics and Computer-Aided Design, media_common
Published
2014

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

Author

Jae Hong Seo and Keita Emura

Subjects
business.industry, Computer science, Applied Mathematics, Computer security, computer.software_genre, Encryption, ID-based encryption, Computer Graphics and Computer-Aided Design, Multiple encryption, Probabilistic encryption, Signal Processing, Scalability, 56-bit encryption, Attribute-based encryption, Electrical and Electronic Engineering, business, computer, Computer network, Communication channel
Published
2013

10. On Discrete Logarithm Based Additively Homomorphic Encryption

Author

Jae Hong Seo and Keita Emura

Subjects
Homomorphic secret sharing, Theoretical computer science, Plaintext-aware encryption, Probabilistic encryption, Discrete logarithm, Computer science, Applied Mathematics, Signal Processing, Homomorphic encryption, XTR, Electrical and Electronic Engineering, Computer Graphics and Computer-Aided Design, ElGamal encryption
Published
2013

11. Methods for Restricting Message Space in Public-Key Encryption

Author

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

Subjects
business.industry, Computer science, Applied Mathematics, Encryption, Computer security, computer.software_genre, Computer Graphics and Computer-Aided Design, Multiple encryption, Probabilistic encryption, Signal Processing, 56-bit encryption, 40-bit encryption, Keyfile, Attribute-based encryption, Electrical and Electronic Engineering, On-the-fly encryption, business, computer
Published
2013

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