General Public Key Residue Cryptosystems and Mental Poker Protocols. - Kaoru Kurosawa; Yutaka Katayama; Wakaha Ogata; Shigeo Tsujii (EUROCRYPT, 1990)

On Claw Free Families. - Wakaha Ogata; Kaoru Kurosawa (ASIACRYPT, 1991)

Nonperfect Secret Sharing Schemes. - Wakaha Ogata; Kaoru Kurosawa; Shigeo Tsujii (AUSCRYPT, 1992)

Nonperfect Secret Sharing Schemes and Matroids. - Kaoru Kurosawa; Koji Okada; Keiichi Sakano; Wakaha Ogata; Shigeo Tsujii (EUROCRYPT, 1993)

t-Cheater Identifiable (k, n) Threshold Secret Sharing Schemes. - Kaoru Kurosawa; Satoshi Obana; Wakaha Ogata (CRYPTO, 1995)

Optimum Secret Sharing Scheme Secure against Cheating. - Wakaha Ogata; Kaoru Kurosawa (EUROCRYPT, 1996)

Multisymbol Majority Vote and Hard Core. - Wakaha Ogata; Keiichi Sakano; Kaoru Kurosawa (Inf. Process. Lett., 1996)

Fault tolerant anonymous channel. - Wakaha Ogata; Kaoru Kurosawa; Kazue Sako; Kazunori Takatani (ICICS, 1997)

Some Basic Properties of General Nonperfect Secret Sharing Schemes. - Wakaha Ogata; Kaoru Kurosawa (J. Univers. Comput. Sci., 1998)

Efficient Rabin-type Digital Signature Scheme. - Kaoru Kurosawa; Wakaha Ogata (Des. Codes Cryptogr., 1999)

On a Fallacious Bound for Authentication Codes. - Carlo Blundo; Alfredo De Santis; Kaoru Kurosawa; Wakaha Ogata (J. Cryptol., 1999)

Provably Secure Metering Scheme. - Wakaha Ogata; Kaoru Kurosawa (ASIACRYPT, 2000)

IND-CCA Public Key Schemes Equivalent to Factoring n=pq. - Kaoru Kurosawa; Wakaha Ogata; Toshihiko Matsuo; Shuichi Makishima (Public Key Cryptography, 2001)

Bounds for Robust Metering Schemes and Their Relationship with A-code. - Wakaha Ogata; Kaoru Kurosawa (ASIACRYPT, 2002)

On the bound for anonymous secret sharing schemes. - Wataru Kishimoto; Koji Okada; Kaoru Kurosawa; Wakaha Ogata (Discret. Appl. Math., 2002)

Bit-Slice Auction Circuit. - Kaoru Kurosawa; Wakaha Ogata (IACR Cryptol. ePrint Arch., 2002)

Brief announcement: a method for exchanging valuable data: how to realize matching oblivious transfer. - Shin'ichiro Matsuo; Wakaha Ogata (PODC, 2003)

Divisible Voting Scheme. - Natsuki Ishida; Shin'ichiro Matsuo; Wakaha Ogata (IACR Cryptol. ePrint Arch., 2003)

Electronic Ticket Scheme for ITS. - Shin'ichiro Matsuo; Wakaha Ogata (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2003)

Matching Oblivious Transfer: How to Exchange Valuable Data. - Shin'ichiro Matsuo; Wakaha Ogata (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2003)

New combinatorial designs and their applications to authentication codes and secret sharing schemes. - Wakaha Ogata; Kaoru Kurosawa; Douglas R. Stinson; Hajime Saido (Discret. Math., 2004)

k out of n Oblivious Transfer without Random Oracles. - Wakaha Ogata; Ryota Sasahara (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2004)

Oblivious keyword search. - Wakaha Ogata; Kaoru Kurosawa (J. Complex., 2004)

Efficient Divisible Voting Scheme. - Natsuki Ishida; Shin'ichiro Matsuo; Wakaha Ogata (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2005)

On a Variation of Kurosawa-Desmedt Encryption Scheme. - Le Trieu Phong; Wakaha Ogata (IACR Cryptol. ePrint Arch., 2006)

Some Practical Public-Key Encryption Schemes in both Standard Model and Random Oracle Model. - Le Trieu Phong; Wakaha Ogata (IACR Cryptol. ePrint Arch., 2006)

Optimum Secret Sharing Scheme Secure against Cheating. - Wakaha Ogata; Kaoru Kurosawa; Douglas R. Stinson (SIAM J. Discret. Math., 2006)

The security of the FDH variant of Chaum's undeniable signature scheme. - Wakaha Ogata; Kaoru Kurosawa; Swee-Huay Heng (IEEE Trans. Inf. Theory, 2006)

ZeroBio - Evaluation and Development of Asymmetric Fingerprint Authentication System Using Oblivious Neural Network Evaluation Protocol. - Kei Nagai; Hiroaki Kikuchi; Wakaha Ogata; Masakatsu Nishigaki (ARES, 2007)

Comments on the Security Proofs of Some Signature Schemes Based on Factorization. - Wakaha Ogata; Naoya Matsumoto (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2007)

On Some Variations of Kurosawa-Desmedt Public-Key Encryption Scheme. - Le Trieu Phong; Wakaha Ogata (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2007)

A General Model of Structured Multisignatures with Message Flexibility. - Dan Yamamoto; Wakaha Ogata (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2007)

Relationship between Two Approaches for Defining the Standard Model PA-ness. - Isamu Teranishi; Wakaha Ogata (ACISP, 2008)

Stateful identity-based encryption scheme: faster encryption and decryption. - Le Trieu Phong; Hiroto Matsuoka; Wakaha Ogata (AsiaCCS, 2008)

Cramer-Shoup Satisfies a Stronger Plaintext Awareness under a Weaker Assumption. - Isamu Teranishi; Wakaha Ogata (SCN, 2008)

Blind HIBE and its Applications to Identity-Based Blind Signature and Blind Decryption. - Le Trieu Phong; Wakaha Ogata (IACR Cryptol. ePrint Arch., 2008)

Relationship between Standard Model Plaintext Awareness and Message Hiding. - Isamu Teranishi; Wakaha Ogata (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2008)

General Conversion for Obtaining Strongly Existentially Unforgeable Signatures. - Isamu Teranishi; Takuro Oyama; Wakaha Ogata (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2008)

A Proposal of Efficient Remote Biometric Authentication Protocol. - Taiki Sakashita; Yoichi Shibata; Takumi Yamamoto; Kenta Takahashi; Wakaha Ogata; Hiroaki Kikuchi; Masakatsu Nishigaki (IWSEC, 2009)

Provably Secure Convertible Undeniable Signatures with Unambiguity. - Le Trieu Phong; Kaoru Kurosawa; Wakaha Ogata (IACR Cryptol. ePrint Arch., 2009)

Forgery Attacks on Time-Stamp, Signed PDF and X.509 Certificate. - Kouichi Itoh; Tetsuya Izu; Wakaha Ogata; Takeshi Shimoyama; Masahiko Takenaka (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2009)

Collision-Based Power Attack for RSA with Small Public Exponent. - Kouichi Itoh; Dai Yamamoto; Jun Yajima; Wakaha Ogata (IEICE Trans. Inf. Syst., 2009)

New Identity-Based Blind Signature and Blind Decryption Scheme in the Standard Model. - Le Trieu Phong; Wakaha Ogata (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2009)

A Framework for Constructing Convertible Undeniable Signatures. - Ryo Kikuchi; Le Trieu Phong; Wakaha Ogata (ProvSec, 2010)

Efficient Almost Secure 1-Round Message Transmission Schemes for 3t+1 Channels. - Toshinori Araki; Wakaha Ogata (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2010)

New RSA-Based (Selectively) Convertible Undeniable Signature Schemes. - Le Trieu Phong; Kaoru Kurosawa; Wakaha Ogata (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2010)

Privacy-preserving similarity evaluation and application to remote biometrics authentication. - Hiroaki Kikuchi; Kei Nagai; Wakaha Ogata; Masakatsu Nishigaki (Soft Comput., 2010)

A Simple and Efficient Secret Sharing Scheme Secure against Cheating. - Toshinori Araki; Wakaha Ogata (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2011)

Provably Secure On-Line Secret Sharing Scheme. - Tatsumi Oba; Wakaha Ogata (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2011)

Undeniable and Unpretendable Signatures. - Le Trieu Phong; Kaoru Kurosawa; Wakaha Ogata (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2012)

Toward Practical Searchable Symmetric Encryption. - Wakaha Ogata; Keita Koiwa; Akira Kanaoka; Shin'ichiro Matsuo (IWSEC, 2013)

Cheating Detectable Secret Sharing Schemes for Random Bit Strings. - Wakaha Ogata; Toshinori Araki (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2013)

Cheating detectable threshold scheme against most powerful cheaters for long secrets. - Wakaha Ogata; Hiroshi Eguchi (Des. Codes Cryptogr., 2014)

Improvement of UC Secure Searchable Symmetric Encryption Scheme. - Shunsuke Taketani; Wakaha Ogata (IWSEC, 2015)

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 (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2015)

Certificateless Aggregate Signature Schemes with Improved Security. - Nguyen Quoc Viet; Wakaha Ogata (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2015)

Unbreakable distributed storage with quantum key distribution network and password-authenticated secret sharing. - Mikio Fujiwara; Atsushi Waseda; Ryo Nojima; Shiho Moriai; Wakaha Ogata; Masahide Sasaki (CoRR, 2016)

Efficient No-dictionary Verifiable SSE. - Wakaha Ogata; Kaoru Kurosawa (IACR Cryptol. ePrint Arch., 2016)

Efficient No-dictionary Verifiable Searchable Symmetric Encryption. - Wakaha Ogata; Kaoru Kurosawa (Financial Cryptography, 2017)

Computationally Secure Verifiable Secret Sharing Scheme for Distributing Many Secrets. - Wakaha Ogata; Toshinori Araki (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2017)

Multi-Divisible On-Line/Off-Line Encryptions. - Dan Yamamoto; Wakaha Ogata (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2017)

Computational SS and conversion protocols in both active and passive settings. - Ryo Kikuchi; Dai Ikarashi; Koji Chida; Koki Hamada; Wakaha Ogata (IET Inf. Secur., 2017)

Efficient Secure Multi-Party Protocols for Decision Tree Classification. - Atsunori Ichikawa; Wakaha Ogata; Koki Hamada; Ryo Kikuchi (ACISP, 2019)

CCA-Secure Leakage-Resilient Identity-Based Key-Encapsulation from Simple (Not mathtt q -type) Assumptions. - Toi Tomita; Wakaha Ogata; Kaoru Kurosawa (IWSEC, 2019)

Tight reduction for generic construction of certificateless signature and its instantiation from DDH assumption. - Keitaro Hashimoto; Wakaha Ogata; Toi Tomita (IACR Cryptol. ePrint Arch., 2019)

CCA-Secure Leakage-Resilient Identity-Based Key-Encapsulation from Simple (not $ mathtt{q}$-type) Assumptions. - Toi Tomita; Wakaha Ogata; Kaoru Kurosawa; Ryo Kuwayama (IACR Cryptol. ePrint Arch., 2019)

No-Dictionary Searchable Symmetric Encryption. - Wakaha Ogata; Kaoru Kurosawa (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2019)

Unrestricted and compact certificateless aggregate signature scheme. - Keitaro Hashimoto; Wakaha Ogata (Inf. Sci., 2019)

Multidivisible Online/Offline Cryptography and Its Application to Signcryptions. - Dan Yamamoto; Wakaha Ogata (Secur. Commun. Networks, 2019)

Communication Protocol Between Humans and Bank Server Secure Against Man-in-the-Browser Attacks. - Koki Mukaihira; Yasuyoshi Jinno; Takashi Tsuchiya; Tetsushi Ohki; Kenta Takahashi; Wakaha Ogata; Masakatsu Nishigaki (IHSI, 2020)

CCA-Secure Leakage-Resilient Identity-Based Encryption without q-Type Assumptions. - Toi Tomita; Wakaha Ogata; Kaoru Kurosawa; Ryo Kuwayama (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2020)

Security analysis of secure kNN and ranked keyword search over encrypted data. - Wakaha Ogata; Takaaki Otemori (Int. J. Inf. Sec., 2020)

Private Decision Tree Evaluation by a Single Untrusted Server for Machine Learnig as a Service. - Yoshifumi Saito; Wakaha Ogata (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2022)

Boosting CPA to CCA2 for Leakage-Resilient Attribute-Based Encryption by Using New QA-NIZK. - Toi Tomita; Wakaha Ogata; Kaoru Kurosawa (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2022)

Perfectly Secure Oblivious Priority Queue. - Atsunori Ichikawa; Wakaha Ogata (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2023)

Security Model for Authenticated Key Exchange, Reconsidered. - Xichen Zhang; Keitaro Hashimoto; Wakaha Ogata (SCN (2), 2024)

Towards a Tightly Secure Signature in Multi-User Setting with Corruptions Based on Search Assumptions. - Hirofumi Yoshioka; Wakaha Ogata; Keitaro Hashimoto (IACR Cryptol. ePrint Arch., 2024)

Chosen-ciphertext secure code-based threshold public key encryptions with short ciphertext. - Kota Takahashi; Keitaro Hashimoto; Wakaha Ogata (Des. Codes Cryptogr., 2024)

Design and Evaluation of User Interface for Server-Aided In-Brain Signature - for Server-Aided In-Brain Signature. - Ryunosuke Harada; Wataru Hatakeyama; Sena Enomoto; Kakeru Hasegawa; Toi Tomita; Kenta Takahashi; Wakaha Ogata; Masakatsu Nishigaki (HCI (63), 2025)

How to Use Your Brain for Cryptography Without Trustworthy Machines. - Wakaha Ogata; Toi Tomita; Kenta Takahashi; Masakatsu Nishigaki (IEEE Access, 2025)

Round-Optimal Authenticated Key Exchange with Full Forward Privacy. - Koki Matsui; Shoma Kanzaki; Wakaha Ogata; Keitaro Hashimoto (IACR Commun. Cryptol., 2025)

Signatures with Tight Adaptive Corruptions from Search Assumptions. - Keitaro Hashimoto; Wakaha Ogata; Yusuke Sakai 001 (IACR Cryptol. ePrint Arch., 2025)