Wakaha Ogata

95 papers A* 5A 6B 2C 3Misc 9Journal 62Unranked 8
YearRankTypeTitle / Venue / Authors
2026 J jnl
Efficient Polynomial Evaluation over Structured Space and Application to Polynomial Method.
IACR Cryptol. ePrint Arch.
Fukang Liu, Vaibhav Dixit, Daisuke Yamamoto, Wakaha Ogata, Santanu Sarkar, Willi Meier
2026 J jnl
Privacy-Preserving Inference of Machine Learning Models without Retraining.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Guilherme T. S. Sato, Wakaha Ogata
2025 — conf
Design and Evaluation of User Interface for Server-Aided In-Brain Signature - for Server-Aided In-Brain Signature.
HCI (63)
Ryunosuke Harada, Wataru Hatakeyama, Sena Enomoto, Kakeru Hasegawa, Toi Tomita, Kenta Takahashi, Wakaha Ogata, Masakatsu Nishigaki
2025 J jnl
How to Use Your Brain for Cryptography Without Trustworthy Machines.
IEEE Access
Wakaha Ogata, Toi Tomita, Kenta Takahashi, Masakatsu Nishigaki
2025 J jnl
How to use your brain for cryptography without trustworthy machines.
IACR Cryptol. ePrint Arch.
Wakaha Ogata, Toi Tomita, Kenta Takahashi, Masakatsu Nishigaki
2025 J jnl
Round-Optimal Authenticated Key Exchange with Full Forward Privacy.
IACR Commun. Cryptol.
Koki Matsui, Shoma Kanzaki, Wakaha Ogata, Keitaro Hashimoto
2025 J jnl
Signatures with Tight Adaptive Corruptions from Search Assumptions.
IACR Cryptol. ePrint Arch.
Keitaro Hashimoto, Wakaha Ogata, Yusuke Sakai
2024 J jnl
Chosen-ciphertext secure code-based threshold public key encryptions with short ciphertext.
Des. Codes Cryptogr.
Kota Takahashi, Keitaro Hashimoto, Wakaha Ogata
2024 — conf
Security Model for Authenticated Key Exchange, Reconsidered.
SCN (2)
Xichen Zhang, Keitaro Hashimoto, Wakaha Ogata
2024 J jnl
Towards a Tightly Secure Signature in Multi-User Setting with Corruptions Based on Search Assumptions.
IACR Cryptol. ePrint Arch.
Hirofumi Yoshioka, Wakaha Ogata, Keitaro Hashimoto
2023 J jnl
Perfectly Secure Oblivious Priority Queue.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Atsunori Ichikawa, Wakaha Ogata
2022 J jnl
Boosting CPA to CCA2 for Leakage-Resilient Attribute-Based Encryption by Using New QA-NIZK.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Toi Tomita, Wakaha Ogata, Kaoru Kurosawa
2022 J jnl
Private Decision Tree Evaluation by a Single Untrusted Server for Machine Learnig as a Service.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Yoshifumi Saito, Wakaha Ogata
2020 J jnl
CCA-Secure Leakage-Resilient Identity-Based Encryption without q-Type Assumptions.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Toi Tomita, Wakaha Ogata, Kaoru Kurosawa, Ryo Kuwayama
2020 — conf
Communication Protocol Between Humans and Bank Server Secure Against Man-in-the-Browser Attacks.
IHSI
Koki Mukaihira, Yasuyoshi Jinno, Takashi Tsuchiya, Tetsushi Ohki, Kenta Takahashi, Wakaha Ogata, Masakatsu Nishigaki
2020 J jnl
Security analysis of secure kNN and ranked keyword search over encrypted data.
Int. J. Inf. Sec.
Wakaha Ogata, Takaaki Otemori
2019 Misc conf
CCA-Secure Leakage-Resilient Identity-Based Key-Encapsulation from Simple (Not \mathtt q -type) Assumptions.
IWSEC
Toi Tomita, Wakaha Ogata, Kaoru Kurosawa
2019 J jnl
CCA-Secure Leakage-Resilient Identity-Based Key-Encapsulation from Simple (not $\mathtt{q}$-type) Assumptions.
IACR Cryptol. ePrint Arch.
Toi Tomita, Wakaha Ogata, Kaoru Kurosawa, Ryo Kuwayama
2019 Misc conf
Efficient Secure Multi-Party Protocols for Decision Tree Classification.
ACISP
Atsunori Ichikawa, Wakaha Ogata, Koki Hamada, Ryo Kikuchi
2019 J jnl
Multidivisible Online/Offline Cryptography and Its Application to Signcryptions.
Secur. Commun. Networks
Dan Yamamoto, Wakaha Ogata
2019 J jnl
No-Dictionary Searchable Symmetric Encryption.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Wakaha Ogata, Kaoru Kurosawa
2019 J jnl
Tight reduction for generic construction of certificateless signature and its instantiation from DDH assumption.
IACR Cryptol. ePrint Arch.
Keitaro Hashimoto, Wakaha Ogata, Toi Tomita
2019 J jnl
Unrestricted and compact certificateless aggregate signature scheme.
Inf. Sci.
Keitaro Hashimoto, Wakaha Ogata
2017 J jnl
Computational SS and conversion protocols in both active and passive settings.
IET Inf. Secur.
Ryo Kikuchi, Dai Ikarashi, Koji Chida, Koki Hamada, Wakaha Ogata
2017 J jnl
Computationally Secure Verifiable Secret Sharing Scheme for Distributing Many Secrets.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Wakaha Ogata, Toshinori Araki
2017 — conf
Efficient No-dictionary Verifiable Searchable Symmetric Encryption.
Financial Cryptography
Wakaha Ogata, Kaoru Kurosawa
2017 J jnl
Multi-Divisible On-Line/Off-Line Encryptions.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Dan Yamamoto, Wakaha Ogata
2016 J jnl
Efficient No-dictionary Verifiable SSE.
IACR Cryptol. ePrint Arch.
Wakaha Ogata, Kaoru Kurosawa
2016 J jnl
Unbreakable distributed storage with quantum key distribution network and password-authenticated secret sharing.
CoRR
Mikio Fujiwara, Atsushi Waseda, Ryo Nojima, Shiho Moriai, Wakaha Ogata, Masahide Sasaki
2015 J jnl
Certificateless Aggregate Signature Schemes with Improved Security.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Nguyen Quoc Viet, Wakaha Ogata
2015 Misc conf
Improvement of UC Secure Searchable Symmetric Encryption Scheme.
IWSEC
Shunsuke Taketani, Wakaha Ogata
2015 J jnl
Secret Sharing with Share-Conversion: Achieving Small Share-Size and Extendibility to Multiparty Computation.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Ryo Kikuchi, Koji Chida, Dai Ikarashi, Wakaha Ogata, Koki Hamada, Katsumi Takahashi
2014 J jnl
Cheating detectable threshold scheme against most powerful cheaters for long secrets.
Des. Codes Cryptogr.
Wakaha Ogata, Hiroshi Eguchi
2013 J jnl
Cheating Detectable Secret Sharing Schemes for Random Bit Strings.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Wakaha Ogata, Toshinori Araki
2013 Misc conf
Toward Practical Searchable Symmetric Encryption.
IWSEC
Wakaha Ogata, Keita Koiwa, Akira Kanaoka, Shin'ichiro Matsuo
2012 J jnl
Undeniable and Unpretendable Signatures.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Le Trieu Phong, Kaoru Kurosawa, Wakaha Ogata
2011 J jnl
A Simple and Efficient Secret Sharing Scheme Secure against Cheating.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Toshinori Araki, Wakaha Ogata
2011 J jnl
Provably Secure On-Line Secret Sharing Scheme.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Tatsumi Oba, Wakaha Ogata
2010 C conf
A Framework for Constructing Convertible Undeniable Signatures.
ProvSec
Ryo Kikuchi, Le Trieu Phong, Wakaha Ogata
2010 J jnl
Efficient Almost Secure 1-Round Message Transmission Schemes for 3t+1 Channels.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Toshinori Araki, Wakaha Ogata
2010 J jnl
New RSA-Based (Selectively) Convertible Undeniable Signature Schemes.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Le Trieu Phong, Kaoru Kurosawa, Wakaha Ogata
2010 J jnl
Privacy-preserving similarity evaluation and application to remote biometrics authentication.
Soft Comput.
Hiroaki Kikuchi, Kei Nagai, Wakaha Ogata, Masakatsu Nishigaki
2010 Misc conf
Provably Secure Convertible Undeniable Signatures with Unambiguity.
SCN
Le Trieu Phong, Kaoru Kurosawa, Wakaha Ogata
2009 Misc conf
A Proposal of Efficient Remote Biometric Authentication Protocol.
IWSEC
Taiki Sakashita, Yoichi Shibata, Takumi Yamamoto, Kenta Takahashi, Wakaha Ogata, Hiroaki Kikuchi, Masakatsu Nishigaki
2009 J jnl
Collision-Based Power Attack for RSA with Small Public Exponent.
IEICE Trans. Inf. Syst.
Kouichi Itoh, Dai Yamamoto, Jun Yajima, Wakaha Ogata
2009 J jnl
Forgery Attacks on Time-Stamp, Signed PDF and X.509 Certificate.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Kouichi Itoh, Tetsuya Izu, Wakaha Ogata, Takeshi Shimoyama, Masahiko Takenaka
2009 J jnl
New Identity-Based Blind Signature and Blind Decryption Scheme in the Standard Model.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Le Trieu Phong, Wakaha Ogata
2009 — conf
New RSA-Based (Selectively) Convertible Undeniable Signature Schemes.
AFRICACRYPT
Le Trieu Phong, Kaoru Kurosawa, Wakaha Ogata
2009 J jnl
Provably Secure Convertible Undeniable Signatures with Unambiguity.
IACR Cryptol. ePrint Arch.
Le Trieu Phong, Kaoru Kurosawa, Wakaha Ogata
2008 J jnl
Blind HIBE and its Applications to Identity-Based Blind Signature and Blind Decryption.
IACR Cryptol. ePrint Arch.
Le Trieu Phong, Wakaha Ogata
2008 Misc conf
Cramer-Shoup Satisfies a Stronger Plaintext Awareness under a Weaker Assumption.
SCN
Isamu Teranishi, Wakaha Ogata
2008 J jnl
General Conversion for Obtaining Strongly Existentially Unforgeable Signatures.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Isamu Teranishi, Takuro Oyama, Wakaha Ogata
2008 B conf
Privacy-Preserving Similarity Evaluation and Application to Remote Biometrics Authentication.
MDAI
Hiroaki Kikuchi, Kei Nagai, Wakaha Ogata, Masakatsu Nishigaki
2008 J jnl
Relationship between Standard Model Plaintext Awareness and Message Hiding.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Isamu Teranishi, Wakaha Ogata
2008 Misc conf
Relationship between Two Approaches for Defining the Standard Model PA-ness.
ACISP
Isamu Teranishi, Wakaha Ogata
2008 A conf
Stateful identity-based encryption scheme: faster encryption and decryption.
AsiaCCS
Le Trieu Phong, Hiroto Matsuoka, Wakaha Ogata
2007 J jnl
A General Model of Structured Multisignatures with Message Flexibility.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Dan Yamamoto, Wakaha Ogata
2007 J jnl
Comments on the Security Proofs of Some Signature Schemes Based on Factorization.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Wakaha Ogata, Naoya Matsumoto
2007 J jnl
On Some Variations of Kurosawa-Desmedt Public-Key Encryption Scheme.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Le Trieu Phong, Wakaha Ogata
2007 B conf
ZeroBio - Evaluation and Development of Asymmetric Fingerprint Authentication System Using Oblivious Neural Network Evaluation Protocol.
ARES
Kei Nagai, Hiroaki Kikuchi, Wakaha Ogata, Masakatsu Nishigaki
2006 Misc conf
General Conversion for Obtaining Strongly Existentially Unforgeable Signatures.
INDOCRYPT
Isamu Teranishi, Takuro Oyama, Wakaha Ogata
2006 J jnl
On a Variation of Kurosawa-Desmedt Encryption Scheme.
IACR Cryptol. ePrint Arch.
Le Trieu Phong, Wakaha Ogata
2006 J jnl
Optimum Secret Sharing Scheme Secure against Cheating.
SIAM J. Discret. Math.
Wakaha Ogata, Kaoru Kurosawa, Douglas R. Stinson
2006 A conf
Relationship Between Standard Model Plaintext Awareness and Message Hiding.
ASIACRYPT
Isamu Teranishi, Wakaha Ogata
2006 J jnl
Some Practical Public-Key Encryption Schemes in both Standard Model and Random Oracle Model.
IACR Cryptol. ePrint Arch.
Le Trieu Phong, Wakaha Ogata
2006 J jnl
The security of the FDH variant of Chaum's undeniable signature scheme.
IEEE Trans. Inf. Theory
Wakaha Ogata, Kaoru Kurosawa, Swee-Huay Heng
2005 J jnl
Efficient Divisible Voting Scheme.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Natsuki Ishida, Shin'ichiro Matsuo, Wakaha Ogata
2005 — conf
The Security of the FDH Variant of Chaum's Undeniable Signature Scheme.
Public Key Cryptography
Wakaha Ogata, Kaoru Kurosawa, Swee-Huay Heng
2004 J jnl
New combinatorial designs and their applications to authentication codes and secret sharing schemes.
Discret. Math.
Wakaha Ogata, Kaoru Kurosawa, Douglas R. Stinson, Hajime Saido
2004 J jnl
Oblivious keyword search.
J. Complex.
Wakaha Ogata, Kaoru Kurosawa
2004 J jnl
The Security of the FDH Variant of Chaum's Undeniable Signature Scheme.
IACR Cryptol. ePrint Arch.
Wakaha Ogata, Kaoru Kurosawa, Swee-Huay Heng
2004 J jnl
k out of n Oblivious Transfer without Random Oracles.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Wakaha Ogata, Ryota Sasahara
2003 A* conf
Brief announcement: a method for exchanging valuable data: how to realize matching oblivious transfer.
PODC
Shin'ichiro Matsuo, Wakaha Ogata
2003 C conf
Divisible Voting Scheme.
ISC
Natsuki Ishida, Shin'ichiro Matsuo, Wakaha Ogata
2003 J jnl
Divisible Voting Scheme.
IACR Cryptol. ePrint Arch.
Natsuki Ishida, Shin'ichiro Matsuo, Wakaha Ogata
2003 J jnl
Electronic Ticket Scheme for ITS.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Shin'ichiro Matsuo, Wakaha Ogata
2003 J jnl
Matching Oblivious Transfer: How to Exchange Valuable Data.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Shin'ichiro Matsuo, Wakaha Ogata
2002 A conf
Bit-Slice Auction Circuit.
ESORICS
Kaoru Kurosawa, Wakaha Ogata
2002 J jnl
Bit-Slice Auction Circuit.
IACR Cryptol. ePrint Arch.
Kaoru Kurosawa, Wakaha Ogata
2002 A conf
Bounds for Robust Metering Schemes and Their Relationship with A-code.
ASIACRYPT
Wakaha Ogata, Kaoru Kurosawa
2002 J jnl
Oblivious Keyword Search.
IACR Cryptol. ePrint Arch.
Wakaha Ogata, Kaoru Kurosawa
2002 J jnl
On the bound for anonymous secret sharing schemes.
Discret. Appl. Math.
Wataru Kishimoto, Koji Okada, Kaoru Kurosawa, Wakaha Ogata
2001 — conf
IND-CCA Public Key Schemes Equivalent to Factoring n=pq.
Public Key Cryptography
Kaoru Kurosawa, Wakaha Ogata, Toshihiko Matsuo, Shuichi Makishima
2000 A conf
Provably Secure Metering Scheme.
ASIACRYPT
Wakaha Ogata, Kaoru Kurosawa
1999 J jnl
Efficient Rabin-type Digital Signature Scheme.
Des. Codes Cryptogr.
Kaoru Kurosawa, Wakaha Ogata
1999 J jnl
On a Fallacious Bound for Authentication Codes.
J. Cryptol.
Carlo Blundo, Alfredo De Santis, Kaoru Kurosawa, Wakaha Ogata
1998 J jnl
Some Basic Properties of General Nonperfect Secret Sharing Schemes.
J. Univers. Comput. Sci.
Wakaha Ogata, Kaoru Kurosawa
1997 C conf
Fault tolerant anonymous channel.
ICICS
Wakaha Ogata, Kaoru Kurosawa, Kazue Sako, Kazunori Takatani
1996 J jnl
Multisymbol Majority Vote and Hard Core.
Inf. Process. Lett.
Wakaha Ogata, Keiichi Sakano, Kaoru Kurosawa
1996 A* conf
Optimum Secret Sharing Scheme Secure against Cheating.
EUROCRYPT
Wakaha Ogata, Kaoru Kurosawa
1995 A* conf
t-Cheater Identifiable (k, n) Threshold Secret Sharing Schemes.
CRYPTO
Kaoru Kurosawa, Satoshi Obana, Wakaha Ogata
1993 A* conf
Nonperfect Secret Sharing Schemes and Matroids.
EUROCRYPT
Kaoru Kurosawa, Koji Okada, Keiichi Sakano, Wakaha Ogata, Shigeo Tsujii
1992 — conf
Nonperfect Secret Sharing Schemes.
AUSCRYPT
Wakaha Ogata, Kaoru Kurosawa, Shigeo Tsujii
1991 A conf
On Claw Free Families.
ASIACRYPT
Wakaha Ogata, Kaoru Kurosawa
1990 A* conf
General Public Key Residue Cryptosystems and Mental Poker Protocols.
EUROCRYPT
Kaoru Kurosawa, Yutaka Katayama, Wakaha Ogata, Shigeo Tsujii