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IEICE Trans

Kazuma OHARA

Clarifying CPU Vendor’s Responsibilities for Remote Attestation with Intel SGX
Takashi YAGAWA Tadanori TERUYA Kazuma OHARA Kuniyasu SUZAKI Hirotake ABE 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2026/03/01
Vol. E109-A  No. 3  pp. 305-316
Type of Manuscript:  Special Section PAPER (Special Section on Cryptography and Information Security)
Category: 
Keyword: 
vendor’s responsibility, Intel SGX, remote attestation, provisioning, trusted execution environment, 
 Summary | Full Text:PDF
Efficient Two-Party Exponentiation from Quotient Transfer
Yi LU Keisuke HARA Kazuma OHARA Jacob SCHULDT Keisuke TANAKA 
Publication:   IEICE TRANSACTIONS on Information and Systems
Publication Date: 2025/12/01
Vol. E108-D  No. 12  pp. 1526-1537
Type of Manuscript:  Special Section PAPER (Special Section on Information and Communication System Security)
Category: 
Keyword: 
two-party computation, additive secret sharing, exponentiation, quotient transfer, 
 Summary | Full Text:PDF
How to Make a Secure Index for Searchable Symmetric Encryption, Revisited
Yohei WATANABE Takeshi NAKAI Kazuma OHARA Takuya NOJIMA Yexuan LIU Mitsugu IWAMOTO Kazuo OHTA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2022/12/01
Vol. E105-A  No. 12  pp. 1559-1577
Type of Manuscript:  PAPER
Category: Cryptography and Information Security
Keyword: 
searchable symmetric encryption, secure index, encrypted search, 
 Summary | Full Text:PDF
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 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2019/09/01
Vol. E102-A  No. 9  pp. 1101-1117
Type of Manuscript:  Special Section PAPER (Special Section on Discrete Mathematics and Its Applications)
Category: Cryptography and Information Security
Keyword: 
group signature, revocation, scalability, 
 Summary | Full Text:PDF
Multi-Party Computation for Modular Exponentiation Based on Replicated Secret Sharing
Kazuma OHARA Yohei WATANABE Mitsugu IWAMOTO Kazuo OHTA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2019/09/01
Vol. E102-A  No. 9  pp. 1079-1090
Type of Manuscript:  Special Section PAPER (Special Section on Discrete Mathematics and Its Applications)
Category: Cryptography and Information Security
Keyword: 
multi-party computation, modular exponentiation, replicated secret sharing, 
 Summary | Full Text:PDF