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IEICE Trans

Kazuto OGAWA

Short Lattice Signature Scheme with Tighter Reduction under Ring-SIS Assumption
Kaisei KAJITA Go OHTAKE Kazuto OGAWA Koji NUIDA Tsuyoshi TAKAGI 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2023/03/01
Vol. E106-A  No. 3  pp. 228-240
Type of Manuscript:  Special Section PAPER (Special Section on Cryptography and Information Security)
Category: 
Keyword: 
digital signatures, ring-SIS assumption, security reduction, trapdoor commitment, 
 Summary | Full Text:PDF
Privacy-Preserving System for Enriched-Integrated Service
Kaisei KAJITA Go OHTAKE Kazuto OGAWA 
Publication:   IEICE TRANSACTIONS on Information and Systems
Publication Date: 2021/05/01
Vol. E104-D  No. 5  pp. 647-658
Type of Manuscript:  Special Section PAPER (Special Section on the Architectures, Protocols, and Applications for the Future Internet)
Category: 
Keyword: 
privacy preserving, attribute-based keyword search, integrated broadcast-broadband service, 
 Summary | Full Text:PDF
A Constant-Size Signature Scheme with a Tighter Reduction from the CDH Assumption
Kaisei KAJITA Kazuto OGAWA Eiichiro FUJISAKI 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2020/01/01
Vol. E103-A  No. 1  pp. 141-149
Type of Manuscript:  Special Section PAPER (Special Section on Cryptography and Information Security)
Category: 
Keyword: 
digital signature, CDH assumption, trapdoor commitment, tight security reduction, 
 Summary | Full Text:PDF
Attribute-Based Encryption for Range Attributes
Nuttapong ATTRAPADUNG Goichiro HANAOKA Kazuto OGAWA Go OHTAKE Hajime WATANABE Shota YAMADA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2018/09/01
Vol. E101-A  No. 9  pp. 1440-1455
Type of Manuscript:  Special Section PAPER (Special Section on Discrete Mathematics and Its Applications)
Category: 
Keyword: 
attribute-based encryption, range attribute, generic construction, 
 Summary | Full Text:PDF
FOREWORD
Kazuto OGAWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2018/01/01
Vol. E101-A  No. 1  pp. 1-2
Type of Manuscript:  FOREWORD
Category: 
Keyword: 
 Summary | Full Text:PDF
Partially Wildcarded Ciphertext-Policy Attribute-Based Encryption and Its Performance Evaluation
Go OHTAKE Kazuto OGAWA Goichiro HANAOKA Shota YAMADA Kohei KASAMATSU Takashi YAMAKAWA Hideki IMAI 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2017/09/01
Vol. E100-A  No. 9  pp. 1846-1856
Type of Manuscript:  Special Section PAPER (Special Section on Discrete Mathematics and Its Applications)
Category: 
Keyword: 
attribute-based encryption, ciphertext policy, wildcard, 
 Summary | Full Text:PDF
How to Make Traitor Tracing Schemes Secure against a Content Comparison Attack in Actual Services
Kazuto OGAWA Goichiro HANAOKA Hideki IMAI 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2017/01/01
Vol. E100-A  No. 1  pp. 34-49
Type of Manuscript:  Special Section PAPER (Special Section on Cryptography and Information Security)
Category: 
Keyword: 
traitor tracing, collusion attack, content comparison, encoding, watermarking, c-secure code, 
 Summary | Full Text:PDF
Application Authentication System with Efficiently Updatable Signature
Kazuto OGAWA Go OHTAKE 
Publication:   IEICE TRANSACTIONS on Information and Systems
Publication Date: 2016/01/01
Vol. E99-D  No. 1  pp. 69-82
Type of Manuscript:  Special Section PAPER (Special Section on Enriched Multimedia---Creation of a New Society through Value-added Multimedia Content---)
Category: 
Keyword: 
hybrid services through broadcasting and communications networks, application authentication, ID-based signature, key-insulated signature, 
 Summary | Full Text:PDF
Weakened Anonymity of Group Signature and Its Application to Subscription Services
Kazuto OGAWA Go OHTAKE Arisa FUJII Goichiro HANAOKA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2014/06/01
Vol. E97-A  No. 6  pp. 1240-1258
Type of Manuscript:  Special Section PAPER (Special Section on Discrete Mathematics and Its Applications)
Category: 
Keyword: 
subscription service, anonymity, linkability, unlinkability, group signature, 
 Summary | Full Text:PDF
Secure Broadcast System with Simultaneous Individual Messaging
Arisa FUJII Go OHTAKE Goichiro HANAOKA Nuttapong ATTRAPADUNG Hajime WATANABE Kazuto OGAWA Hideki IMAI 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2011/06/01
Vol. E94-A  No. 6  pp. 1328-1337
Type of Manuscript:  Special Section PAPER (Special Section on Discrete Mathematics and Its Applications)
Category: 
Keyword: 
digital broadcasting, copyright protection, Conditional Access System (CAS), broadcast encryption, 
 Summary | Full Text:PDF
Efficient Provider Authentication for Bidirectional Broadcasting Service
Go OHTAKE Goichiro HANAOKA Kazuto OGAWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2010/06/01
Vol. E93-A  No. 6  pp. 1039-1051
Type of Manuscript:  Special Section PAPER (Special Section on Discrete Mathematics and Its Applications)
Category: Cryptography and Information Security
Keyword: 
bidirectional broadcasting service, provider authentication, personal information protection, key leakage, strong key-insulated signature, 
 Summary | Full Text:PDF
A Trade-off Traitor Tracing Scheme
Go OHTAKE Kazuto OGAWA Goichiro HANAOKA Hideki IMAI 
Publication:   IEICE TRANSACTIONS on Information and Systems
Publication Date: 2009/05/01
Vol. E92-D  No. 5  pp. 859-875
Type of Manuscript:  Special Section PAPER (Special Section on Information and Communication System Security)
Category: Contents Protection
Keyword: 
dynamic traitor tracing, watermarking, digital rights management, content distribution, 
 Summary | Full Text:PDF
An Efficient 2-Secure and Short Random Fingerprint Code and Its Security Evaluation
Koji NUIDA Satoshi FUJITSU Manabu HAGIWARA Hideki IMAI Takashi KITAGAWA Kazuto OGAWA Hajime WATANABE 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2009/01/01
Vol. E92-A  No. 1  pp. 197-206
Type of Manuscript:  Special Section PAPER (Special Section on Cryptography and Information Security)
Category: Application
Keyword: 
fingerprint, c-secure code, collusion attack, security analysis, watermark, DRM, 
 Summary | Full Text:PDF
Extension of Broadcasting Service by Using Electronic Tokens
Kazuto OGAWA Goichiro HANAOKA Hideki IMAI 
Publication:   IEICE TRANSACTIONS on Information and Systems
Publication Date: 2007/11/01
Vol. E90-D  No. 11  pp. 1741-1750
Type of Manuscript:  PAPER
Category: Contents Technology and Web Information Systems
Keyword: 
content distribution, token, anonymity, group signature, privacy preservation, 
 Summary | Full Text:PDF
Traitor Tracing Scheme Secure against Adaptive Key Exposure and its Application to Anywhere TV Service
Kazuto OGAWA Goichiro HANAOKA Hideki IMAI 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2007/05/01
Vol. E90-A  No. 5  pp. 1000-1011
Type of Manuscript:  Special Section PAPER (Special Section on Discrete Mathematics and Its Applications)
Category: 
Keyword: 
traitor tracing, key exposure, key update, two variable-polynomial, 
 Summary | Full Text:PDF
Managing Encryption and Key Publication Independently in Digital Rights Management Systems
Goichiro HANAOKA Kazuto OGAWA Itsuro MUROTA Go OHTAKE Keigo MAJIMA Seiichi GOHSHI Kimiyuki OYAMADA Seiichi NAMBA Hideki IMAI 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2004/01/01
Vol. E87-A  No. 1  pp. 160-172
Type of Manuscript:  Special Section PAPER (Special Section on Cryptography and Information Security)
Category: Applications
Keyword: 
digital rights management systems, copyright protection, semantic security, adaptive attacks, 
 Summary | Full Text:PDF