IEICE Trans

Wakaha OGATA

Private Decision Tree Evaluation by a Single Untrusted Server for Machine Learnig as a Service Yoshifumi SAITO Wakaha OGATA
Publication: Publication Date: 2022/03/01 Vol. E105-A No. 3 pp. 203-213 Type of Manuscript: Special Section PAPER (Special Section on Cryptography and Information Security) Category: Keyword: privacy preserving, decision tree evaluation, fully homomorphic encryption, secure multiparty computation,
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Boosting CPA to CCA2 for Leakage-Resilient Attribute-Based Encryption by Using New QA-NIZK Toi TOMITA Wakaha OGATA Kaoru KUROSAWA
Publication: Publication Date: 2022/03/01 Vol. E105-A No. 3 pp. 143-159 Type of Manuscript: Special Section PAPER (Special Section on Cryptography and Information Security) Category: Keyword: leakage-resilience, CCA2-security, attribute-based encryption, QA-NIZK, simulation-soundness,
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CCA-Secure Leakage-Resilient Identity-Based Encryption without q-Type Assumptions Toi TOMITA Wakaha OGATA Kaoru KUROSAWA Ryo KUWAYAMA
Publication: Publication Date: 2020/10/01 Vol. E103-A No. 10 pp. 1157-1166 Type of Manuscript: Special Section PAPER (Special Section on Discrete Mathematics and Its Applications) Category: cryptography Keyword: identity-based encryption, leakage-resilience, CCA-security,
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No-Dictionary Searchable Symmetric Encryption Wakaha OGATA Kaoru KUROSAWA
Publication: Publication Date: 2019/01/01 Vol. E102-A No. 1 pp. 114-124 Type of Manuscript: Special Section PAPER (Special Section on Cryptography and Information Security) Category: Keyword: searchable symmetric encryption, dictionary, verifiable, search pattern,
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Multi-Divisible On-Line/Off-Line Encryptions Dan YAMAMOTO Wakaha OGATA
Publication: Publication Date: 2017/01/01 Vol. E100-A No. 1 pp. 91-102 Type of Manuscript: Special Section PAPER (Special Section on Cryptography and Information Security) Category: Keyword: public-key encryption, on-line/off-line encryption, divisible, multi-user setting, KEM,
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Computationally Secure Verifiable Secret Sharing Scheme for Distributing Many Secrets Wakaha OGATA Toshinori ARAKI
Publication: Publication Date: 2017/01/01 Vol. E100-A No. 1 pp. 103-114 Type of Manuscript: Special Section PAPER (Special Section on Cryptography and Information Security) Category: Keyword: secret sharing, multi-secret sharing, on-line secret sharing, verifiable secret sharing, computational security,
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Secret Sharing with Share-Conversion: Achieving Small Share-Size and Extendibility to Multiparty Computation Ryo KIKUCHI Koji CHIDA Dai IKARASHI Wakaha OGATA Koki HAMADA Katsumi TAKAHASHI
Publication: IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences Publication Date: 2015/01/01 Vol. E98-A No. 1 pp. 213-222 Type of Manuscript: Special Section PAPER (Special Section on Cryptography and Information Security) Category: Foundation Keyword: secret sharing scheme, multiparty computation, code-efficiency,
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Certificateless Aggregate Signature Schemes with Improved Security Nguyen Quoc VIET Wakaha OGATA
Publication: IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences Publication Date: 2015/01/01 Vol. E98-A No. 1 pp. 92-99 Type of Manuscript: Special Section PAPER (Special Section on Cryptography and Information Security) Category: Public Key Based Cryptography Keyword: certificateless signature, aggregate signature, coalition attack,
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Cheating Detectable Secret Sharing Schemes for Random Bit Strings Wakaha OGATA Toshinori ARAKI
Publication: IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences Publication Date: 2013/11/01 Vol. E96-A No. 11 pp. 2230-2234 Type of Manuscript: PAPER Category: Cryptography and Information Security Keyword: secret sharing, cheating detection,
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Undeniable and Unpretendable Signatures Le Trieu PHONG Kaoru KUROSAWA Wakaha OGATA
Publication: IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences Publication Date: 2012/01/01 Vol. E95-A No. 1 pp. 138-150 Type of Manuscript: Special Section PAPER (Special Section on Cryptography and Information Security) Category: Authentication Keyword: anonymity, undeniable signatures, selective/all conversion, unpretendable signatures, anonymous auction,
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A Simple and Efficient Secret Sharing Scheme Secure against Cheating Toshinori ARAKI Wakaha OGATA
Publication: IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences Publication Date: 2011/06/01 Vol. E94-A No. 6 pp. 1338-1345 Type of Manuscript: Special Section PAPER (Special Section on Discrete Mathematics and Its Applications) Category: Keyword: secret sharing, cheating detection,
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Provably Secure On-Line Secret Sharing Scheme Tatsumi OBA Wakaha OGATA
Publication: IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences Publication Date: 2011/01/01 Vol. E94-A No. 1 pp. 139-149 Type of Manuscript: Special Section PAPER (Special Section on Cryptography and Information Security) Category: Secure Protocol Keyword: secret sharing, on-line secret sharing, public bulletin board, provably secure,
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New RSA-Based (Selectively) Convertible Undeniable Signature Schemes Le Trieu PHONG Kaoru KUROSAWA Wakaha OGATA
Publication: IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences Publication Date: 2010/01/01 Vol. E93-A No. 1 pp. 63-75 Type of Manuscript: Special Section PAPER (Special Section on Cryptography and Information Security) Category: Digital Signature Keyword: RSA, undeniable signature, selective/all conversion, standard model,
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Efficient Almost Secure 1-Round Message Transmission Schemes for 3t+1 Channels Toshinori ARAKI Wakaha OGATA
Publication: IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences Publication Date: 2010/01/01 Vol. E93-A No. 1 pp. 126-135 Type of Manuscript: Special Section PAPER (Special Section on Cryptography and Information Security) Category: Secure Protocol Keyword: unconditionally secure message transmission, secret sharing,
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New Identity-Based Blind Signature and Blind Decryption Scheme in the Standard Model Le Trieu PHONG Wakaha OGATA
Publication: IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences Publication Date: 2009/08/01 Vol. E92-A No. 8 pp. 1822-1835 Type of Manuscript: Special Section PAPER (Special Section on Discrete Mathematics and Its Applications) Category: Theory Keyword: blind HIBE, identity-based blind signature, blind decryption, provable security, standard model,
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Collision-Based Power Attack for RSA with Small Public Exponent Kouichi ITOH Dai YAMAMOTO Jun YAJIMA Wakaha OGATA
Publication: IEICE TRANSACTIONS on Information and Systems Publication Date: 2009/05/01 Vol. E92-D No. 5 pp. 897-908 Type of Manuscript: Special Section PAPER (Special Section on Information and Communication System Security) Category: Implementation Issues Keyword: power attack, collision attack, SPA, DPA, RSA, window method, countermeasure,
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Forgery Attacks on Time-Stamp, Signed PDF and X.509 Certificate Kouichi ITOH Tetsuya IZU Wakaha OGATA Takeshi SHIMOYAMA Masahiko TAKENAKA
Publication: IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences Publication Date: 2009/01/01 Vol. E92-A No. 1 pp. 67-75 Type of Manuscript: Special Section PAPER (Special Section on Cryptography and Information Security) Category: Digital Signature Keyword: Bleichenbacher's forgery attack, RSASSA-PKCS-v1_5, time-stamp, PDF, X.509 certificate, Acrobat, Acrobat Reader,
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Relationship between Standard Model Plaintext Awareness and Message Hiding Isamu TERANISHI Wakaha OGATA
Publication: IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences Publication Date: 2008/01/01 Vol. E91-A No. 1 pp. 244-261 Type of Manuscript: Special Section PAPER (Special Section on Cryptography and Information Security) Category: Security Notions Keyword: plaintext awareness, standard model,
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General Conversion for Obtaining Strongly Existentially Unforgeable Signatures Isamu TERANISHI Takuro OYAMA Wakaha OGATA
Publication: IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences Publication Date: 2008/01/01 Vol. E91-A No. 1 pp. 94-106 Type of Manuscript: Special Section PAPER (Special Section on Cryptography and Information Security) Category: Signatures Keyword: signature scheme, strong unforgeability, standard model, chameleon commitment, chosen message security,
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Comments on the Security Proofs of Some Signature Schemes Based on Factorization Wakaha OGATA Naoya MATSUMOTO
Publication: IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences Publication Date: 2007/02/01 Vol. E90-A No. 2 pp. 526-530 Type of Manuscript: LETTER Category: Information Security Keyword: digital signature, Rabin-type signature, random oracle model, simulation, factorization,
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A General Model of Structured Multisignatures with Message Flexibility Dan YAMAMOTO Wakaha OGATA
Publication: IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences Publication Date: 2007/01/01 Vol. E90-A No. 1 pp. 83-90 Type of Manuscript: Special Section PAPER (Special Section on Cryptography and Information Security) Category: Signatures Keyword: multisignatures, aggregate signatures, bilinear maps, random oracle model,
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On Some Variations of Kurosawa-Desmedt Public-Key Encryption Scheme Le Trieu PHONG Wakaha OGATA
Publication: IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences Publication Date: 2007/01/01 Vol. E90-A No. 1 pp. 226-230 Type of Manuscript: Special Section LETTER (Special Section on Cryptography and Information Security) Category: Keyword: hybrid encryption, standard model, DDH assumption, IND-CCA,
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Efficient Divisible Voting Scheme Natsuki ISHIDA Shin'ichiro MATSUO Wakaha OGATA
Publication: IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences Publication Date: 2005/01/01 Vol. E88-A No. 1 pp. 230-238 Type of Manuscript: Special Section PAPER (Special Section on Cryptography and Information Security) Category: Application Keyword: secure electronic voting, homomorphic encryption,
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k out of n Oblivious Transfer without Random Oracles Wakaha OGATA Ryota SASAHARA
Publication: IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences Publication Date: 2004/01/01 Vol. E87-A No. 1 pp. 147-151 Type of Manuscript: Special Section PAPER (Special Section on Cryptography and Information Security) Category: Protocol Keyword: oblivious transfer protocol, random oracle model,
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Electronic Ticket Scheme for ITS Shin'ichiro MATSUO Wakaha OGATA
Publication: IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences Publication Date: 2003/01/01 Vol. E86-A No. 1 pp. 142-150 Type of Manuscript: Special Section PAPER (Special Section on Cryptography and Information Security) Category: Protocols etc. Keyword: ITS, electronic ticket, electronic money,
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Matching Oblivious Transfer: How to Exchange Valuable Data Shin'ichiro MATSUO Wakaha OGATA
Publication: IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences Publication Date: 2003/01/01 Vol. E86-A No. 1 pp. 189-193 Type of Manuscript: Special Section LETTER (Special Section on Cryptography and Information Security) Category: Keyword: oblivious transfer, multiparty protocol, electronic market and matching,
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On the Practical Secret Sharing Scheme Wakaha OGATA
Publication: IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences Publication Date: 2001/01/01 Vol. E84-A No. 1 pp. 256-261 Type of Manuscript: Special Section PAPER (Special Section on Cryptography and Information Security) Category: Keyword: secret sharing scheme, ramp scheme, cheating of participant, share size,
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Analysis on Secret Sharing Schemes with Non-Graphical Access Structures Koji OKADA Wakaha OGATA Keiichi SAKANO Kaoru KUROSAWA
Publication: IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences Publication Date: 1997/01/25 Vol. E80-A No. 1 pp. 85-89 Type of Manuscript: Special Section PAPER (Special Section on Cryptography and Information Security) Category: Keyword: secret sharing, share size, non-graphical,
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Reshufflable and Laziness Tolerant Mental Card Game Protocol Kaoru KUROSAWA Yutaka KATAYAMA Wakaha OGATA
Publication: IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences Publication Date: 1997/01/25 Vol. E80-A No. 1 pp. 72-78 Type of Manuscript: Special Section PAPER (Special Section on Cryptography and Information Security) Category: Keyword: mental poker, zero knowledge, multiparty protocol, probabilistic encryption, laziness tolerant,
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4-Move Perfect ZKIP for Some Promise Problems Kaoru KUROSAWA Wakaha OGATA Shigeo TSUJII
Publication: IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences Publication Date: 1995/01/25 Vol. E78-A No. 1 pp. 34-41 Type of Manuscript: Special Section PAPER (Special Section on Cryptography and Information Security) Category: Keyword: perfect ZKIP, promise problem, promised BPP,
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On Claw Free Families Wakaha OGATA Kaoru KUROSAWA
Publication: IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences Publication Date: 1994/01/25 Vol. E77-A No. 1 pp. 72-80 Type of Manuscript: Special Section PAPER (Special Section on Cryptography and Information Security) Category: Keyword: claw free, one-way function, homomorphic property, digital signature, hash function,
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