A digital signature scheme based on polynomial operations. - Tatsuaki Okamoto; Akira Shiraishi (Syst. Comput. Jpn., 1986)

Specification and Verification of Decentralized Daisy Chain Arbiters with omega-Extended Regular Expressions. - Ichiro Suzuki; Y. Motohashi; Kenichi Taniguchi; Tadao Kasami; Tatsuaki Okamoto (Theor. Comput. Sci., 1986)

A single public-key authentication scheme for multiple users. - Tatsuaki Okamoto (Syst. Comput. Jpn., 1987)

A Modification of the Fiat-Shamir Scheme. - Kazuo Ohta; Tatsuaki Okamoto (CRYPTO, 1988)

A Digital Multisignature Schema Using Bijective Public-Key Cryptosystems. - Tatsuaki Okamoto (ACM Trans. Comput. Syst., 1988)

Disposable Zero-Knowledge Authentications and Their Applications to Untraceable Electronic Cash. - Tatsuaki Okamoto; Kazuo Ohta (CRYPTO, 1989)

Divertible Zero Knowledge Interactive Proofs and Commutative Random Self-Reducibility. - Tatsuaki Okamoto; Kazuo Ohta (EUROCRYPT, 1989)

How to Utilize the Randomness of Zero-Knowledge Proofs. - Tatsuaki Okamoto; Kazuo Ohta (CRYPTO, 1990)

Membership Authentication for Hierarchical Multigroups Using the Extended Fiat-Shamir Scheme. - Kazuo Ohta; Tatsuaki Okamoto; Kenji Koyama (EUROCRYPT, 1990)

A fast signature scheme based on congruential polynomial operations. - Tatsuaki Okamoto (IEEE Trans. Inf. Theory, 1990)

A Digital Multisignature Scheme Based on the Fiat-Shamir Scheme. - Kazuo Ohta; Tatsuaki Okamoto (ASIACRYPT, 1991)

An Extensin of Zero-Knowledge Proofs and Its Applications. - Tatsuaki Okamoto (ASIACRYPT, 1991)

New Public-Key Schemes Based on Elliptic Curves over the Ring Zn. - Kenji Koyama; Ueli M. Maurer; Tatsuaki Okamoto; Scott A. Vanstone (CRYPTO, 1991)

Universal Electronic Cash. - Tatsuaki Okamoto; Kazuo Ohta (CRYPTO, 1991)

Efficient Algorithms for the Construction of Hyperelliptic Cryptosystems. - Tatsuaki Okamoto; Kouichi Sakurai (CRYPTO, 1991)

ESIGN: An Efficient Digital Signature Implementation for Smard Cards. - Atsushi Fujioka; Tatsuaki Okamoto; Shoji Miyaguchi (EUROCRYPT, 1991)

Interactive Bi-Proof Systems and Undeniable Signature Schemes. - Atsushi Fujioka; Tatsuaki Okamoto; Kazuo Ohta (EUROCRYPT, 1991)

Direct Zero Knowledge Proofs of Computational Power in Five Rounds. - Tatsuaki Okamoto; David Chaum; Kazuo Ohta (EUROCRYPT, 1991)

A Practical Secret Voting Scheme for Large Scale Elections. - Atsushi Fujioka; Tatsuaki Okamoto; Kazuo Ohta (AUSCRYPT, 1992)

Provably Secure and Practical Identification Schemes and Corresponding Signature Schemes. - Tatsuaki Okamoto (CRYPTO, 1992)

An Efficient Digital Signature Scheme Based on an Elliptic Curve Over the Ring Zn. - Tatsuaki Okamoto; Atsushi Fujioka; Eiichiro Fujisaki (CRYPTO, 1992)

Secure Bit Commitment Function against Divertibility. - Kazuo Ohta; Tatsuaki Okamoto; Atsushi Fujioka (EUROCRYPT, 1992)

How Intractable Is the Discrete Logarithm for a General Finite Group? - Tatsuaki Okamoto; Kouichi Sakurai; Hiroki Shizuya (EUROCRYPT, 1992)

On Key Distribution and Authentication in Mobile Radio Networks. - Choonsik Park; Kaoru Kurosawa; Tatsuaki Okamoto; Shigeo Tsujii (EUROCRYPT, 1993)

On the Relationship among Cryptographic Physical Assumptions. - Tatsuaki Okamoto (ISAAC, 1993)

Reducing elliptic curve logarithms to logarithms in a finite field. - Alfred Menezes; Tatsuaki Okamoto; Scott A. Vanstone (IEEE Trans. Inf. Theory, 1993)

Zero-Knowledge Proofs of Computational Power in the Shared String Model. - Alfredo De Santis; Tatsuaki Okamoto; Giuseppe Persiano (ASIACRYPT, 1994)

How to Simultaneously Exchange Secrets by General Assumptions. - Tatsuaki Okamoto; Kazuo Ohta (CCS, 1994)

Designated Confirmer Signatures and Public-Key Encryption are Equivalent. - Tatsuaki Okamoto (CRYPTO, 1994)

Single-Term Divisible Electronic Coins. - Tony L. Eng; Tatsuaki Okamoto (EUROCRYPT, 1994)

Honest Verifier vs Dishonest Verifier in Public Coin Zero-Knowledge Proofs. - Ivan Damgård; Oded Goldreich 001; Tatsuaki Okamoto; Avi Wigderson (CRYPTO, 1995)

An Efficient Divisible Electronic Cash Scheme. - Tatsuaki Okamoto (CRYPTO, 1995)

An electronic voting scheme. - Tatsuaki Okamoto (IFIP World Conference on IT Tools, 1996)

Practical Escrow Cash System. - Eiichiro Fujisaki; Tatsuaki Okamoto (Security Protocols Workshop, 1996)

Keeping the SZK-Verifier Honest Unconditionally. - Giovanni Di Crescenzo; Tatsuaki Okamoto; Moti Yung (CRYPTO, 1997)

Statistical Zero Knowledge Protocols to Prove Modular Polynomial Relations. - Eiichiro Fujisaki; Tatsuaki Okamoto (CRYPTO, 1997)

Receipt-Free Electronic Voting Schemes for Large Scale Elections. - Tatsuaki Okamoto (Security Protocols Workshop, 1997)

Threshold Key-Recovery Systems for RSA. - Tatsuaki Okamoto (Security Protocols Workshop, 1997)

On Concrete Security Treatment of Signatures Derived from Identification. - Kazuo Ohta; Tatsuaki Okamoto (CRYPTO, 1998)

A Practical and Provably Secure Scheme for Publicly Verifiable Secret Sharing and Its Applications. - Eiichiro Fujisaki; Tatsuaki Okamoto (EUROCRYPT, 1998)

A New Public-Key Cryptosystem as Secure as Factoring. - Tatsuaki Okamoto; Shigenori Uchiyama (EUROCRYPT, 1998)

Security of an Identity-Based Cryptosystem and the Related Reductions. - Tatsuaki Okamoto; Shigenori Uchiyama (EUROCRYPT, 1998)

Lower Bounds on Term-Based Divisible Cash Systems. - Tatsuaki Okamoto; Moti Yung (Public Key Cryptography, 1998)

A Signature Scheme with Message Recovery as Secure as Discrete Logarithm. - Masayuki Abe; Tatsuaki Okamoto (ASIACRYPT, 1999)

An Improvement on a Practical Secret Voting Scheme. - Miyako Ohkubo; Fumiaki Miura; Masayuki Abe; Atsushi Fujioka; Tatsuaki Okamoto (ISW, 1999)

How to Enhance the Security of Public-Key Encryption at Minimum Cost. - Eiichiro Fujisaki; Tatsuaki Okamoto (Public Key Cryptography, 1999)

Provably Secure Partially Blind Signatures. - Masayuki Abe; Tatsuaki Okamoto (CRYPTO, 2000)

Quantum Public-Key Cryptosystems. - Tatsuaki Okamoto; Keisuke Tanaka; Shigenori Uchiyama (CRYPTO, 2000)

On Relationships between Statistical Zero-Knowledge Proofs. - Tatsuaki Okamoto (J. Comput. Syst. Sci., 2000)

REACT: Rapid Enhanced-Security Asymmetric Cryptosystem Transform. - Tatsuaki Okamoto; David Pointcheval (CT-RSA, 2001)

The Gap-Problems: A New Class of Problems for the Security of Cryptographic Schemes. - Tatsuaki Okamoto; David Pointcheval (Public Key Cryptography, 2001)

Delegation Chains Secure up to Constant Length. - Masayuki Abe; Tatsuaki Okamoto (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2002)

Almost Uniform Density of Power Residues and the Provable Security of ESIGN. - Tatsuaki Okamoto; Jacques Stern (ASIACRYPT, 2003)

Resource Bounded Unprovability of Computational Lower Bounds. - Tatsuaki Okamoto; Ryo Kashima (IACR Cryptol. ePrint Arch., 2003)

An RSA Family of Trap-Door Permutations with a Common Domain and Its Applications. - Ryotaro Hayashi 001; Tatsuaki Okamoto; Keisuke Tanaka (Public Key Cryptography, 2004)

RSA-OAEP Is Secure under the RSA Assumption. - Eiichiro Fujisaki; Tatsuaki Okamoto; David Pointcheval; Jacques Stern (J. Cryptol., 2004)

Relationship of three cryptographic channels in the UC framework. - Tatsuaki Okamoto (ICITS, 2005)

Security and Performance Evaluation of ESIGN and RSA on IC Cards by Using Byte-Unit Modular Algorithms. - Chung-Huang Yang; Hikaru Morita; Tatsuaki Okamoto (IEICE Trans. Commun., 2005)

Cryptography Based on Bilinear Maps. - Tatsuaki Okamoto (AAECC, 2006)

On Pairing-Based Cryptosystems. - Tatsuaki Okamoto (VIETCRYPT, 2006)

On the Equivalence of Several Security Notions of Key Encapsulation Mechanism. - Waka Nagao; Yoshifumi Manabe; Tatsuaki Okamoto (IACR Cryptol. ePrint Arch., 2006)

Efficient Blind and Partially Blind Signatures Without Random Oracles. - Tatsuaki Okamoto (IACR Cryptol. ePrint Arch., 2006)

A Universally Composable Secure Channel Based on the KEM-DEM Framework. - Waka Nagao; Yoshifumi Manabe; Tatsuaki Okamoto (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2006)

Authenticated Key Exchange and Key Encapsulation in the Standard Model. - Tatsuaki Okamoto (ASIACRYPT, 2007)

Authenticated Key Exchange and Key Encapsulation Without Random Oracles. - Tatsuaki Okamoto (IACR Cryptol. ePrint Arch., 2007)

An Efficient Anonymous Credential System. - Norio Akagi; Yoshifumi Manabe; Tatsuaki Okamoto (Financial Cryptography, 2008)

Homomorphic Encryption and Signatures from Vector Decomposition. - Tatsuaki Okamoto; Katsuyuki Takashima (Pairing, 2008)

Relationship of Three Cryptographic Channels in the UC Framework. - Waka Nagao; Yoshifumi Manabe; Tatsuaki Okamoto (ProvSec, 2008)

Anonymous return route information for onion based mix-nets. - Yoshifumi Manabe; Tatsuaki Okamoto (SecureComm, 2008)

On the Equivalence of Several Security Notions of KEM and DEM. - Waka Nagao; Yoshifumi Manabe; Tatsuaki Okamoto (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2008)

Universally Composable Identity-Based Encryption. - Ryo Nishimaki; Yoshifumi Manabe; Tatsuaki Okamoto (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2008)

An optimistic fair exchange protocol and its security in the universal composability framework. - Yusuke Okada; Yoshifumi Manabe; Tatsuaki Okamoto (Int. J. Appl. Cryptogr., 2008)

Hierarchical Predicate Encryption for Inner-Products. - Tatsuaki Okamoto; Katsuyuki Takashima (ASIACRYPT, 2009)

Compact CCA-Secure Encryption for Messages of Arbitrary Length. - Masayuki Abe; Eike Kiltz; Tatsuaki Okamoto (Public Key Cryptography, 2009)

Meta-Envy-Free Cake-Cutting Protocols. - Yoshifumi Manabe; Tatsuaki Okamoto (MFCS, 2010)

Fully Secure Functional Encryption: Attribute-Based Encryption and (Hierarchical) Inner Product Encryption. - Allison B. Lewko; Tatsuaki Okamoto; Amit Sahai; Katsuyuki Takashima; Brent Waters (IACR Cryptol. ePrint Arch., 2010)

Fully Secure Functional Encryption with General Relations from the Decisional Linear Assumption. - Tatsuaki Okamoto; Katsuyuki Takashima (IACR Cryptol. ePrint Arch., 2010)

Chosen Ciphertext Security with Optimal Ciphertext Overhead. - Masayuki Abe; Eike Kiltz; Tatsuaki Okamoto (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2010)

Some Key Techniques on Pairing Vector Spaces. - Tatsuaki Okamoto; Katsuyuki Takashima (AFRICACRYPT, 2011)

Leakage resilient eCK-secure key exchange protocol without random oracles. - Daisuke Moriyama; Tatsuaki Okamoto (AsiaCCS, 2011)

Efficient Attribute-Based Signatures for Non-Monotone Predicates in the Standard Model. - Tatsuaki Okamoto; Katsuyuki Takashima (IACR Cryptol. ePrint Arch., 2011)

Decentralized Attribute-Based Signatures. - Tatsuaki Okamoto; Katsuyuki Takashima (IACR Cryptol. ePrint Arch., 2011)

An eCK-secure Authenticated Key Exchange Protocol without Random Oracles. - Daisuke Moriyama; Tatsuaki Okamoto (KSII Trans. Internet Inf. Syst., 2011)

Efficient Concurrent Oblivious Transfer in Super-Polynomial-Simulation Security. - Susumu Kiyoshima; Yoshifumi Manabe; Tatsuaki Okamoto (IWSEC, 2012)

A Cryptographic Moving-Knife Cake-Cutting Protocol - Yoshifumi Manabe; Tatsuaki Okamoto (IWIGP, 2012)

Fully Secure Unbounded Inner-Product and Attribute-Based Encryption. - Tatsuaki Okamoto; Katsuyuki Takashima (IACR Cryptol. ePrint Arch., 2012)

Meta-envy-free Cake-cutting and Pie-cutting Protocols. - Yoshifumi Manabe; Tatsuaki Okamoto (J. Inf. Process., 2012)

Constant-Round Black-Box Construction of Composable Multi-Party Computation Protocol. - Susumu Kiyoshima; Yoshifumi Manabe; Tatsuaki Okamoto (IACR Cryptol. ePrint Arch., 2013)

Message Recovery Signature Schemes from Sigma-Protocols. - Masayuki Abe; Tatsuaki Okamoto; Koutarou Suzuki (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2013)

Efficient Secure Auction Protocols Based on the Boneh-Goh-Nissim Encryption. - Takuho Mitsunaga; Yoshifumi Manabe; Tatsuaki Okamoto (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2013)

Efficient (Hierarchical) Inner-Product Encryption Tightly Reduced from the Decisional Linear Assumption. - Tatsuaki Okamoto; Katsuyuki Takashima (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2013)

Secure Integration of Asymmetric and Symmetric Encryption Schemes. - Eiichiro Fujisaki; Tatsuaki Okamoto (J. Cryptol., 2013)

Achieving short ciphertexts or short secret-keys for adaptively secure general inner-product encryption. - Tatsuaki Okamoto; Katsuyuki Takashima (Des. Codes Cryptogr., 2015)

New Realizations of Somewhere Statistically Binding Hashing and Positional Accumulators. - Tatsuaki Okamoto; Krzysztof Pietrzak; Brent Waters; Daniel Wichs (IACR Cryptol. ePrint Arch., 2015)

Dual Pairing Vector Spaces and Their Applications. - Tatsuaki Okamoto; Katsuyuki Takashima (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2015)

A Cryptographic Moving-Knife Cake-Cutting Protocol with High Social Surplus. - Yoshifumi Manabe; Risako Otsuka; Tatsuaki Okamoto (J. Inf. Process., 2015)

Efficient Functional Encryption for Inner-Product Values with Full-Hiding Security. - Junichi Tomida; Masayuki Abe; Tatsuaki Okamoto (ISC, 2016)

A Unified Paradigm of Organized Complexity and Semantic Information Theory. - Tatsuaki Okamoto (CoRR, 2016)

Packing Messages and Optimizing Bootstrapping in GSW-FHE. - Ryo Hiromasa; Masayuki Abe; Tatsuaki Okamoto (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2016)

A Secure M + 1st Price Auction Protocol Based on Bit Slice Circuits. - Takuho Mitsunaga; Yoshifumi Manabe; Tatsuaki Okamoto (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2016)

Adaptively Attribute-Hiding (Hierarchical) Inner Product Encryption. - Tatsuaki Okamoto; Katsuyuki Takashima (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2016)

Signature Schemes with Randomized Verification. - Cody Freitag; Rishab Goyal; Susan Hohenberger; Venkata Koppula; Eysa Lee; Tatsuaki Okamoto; Jordan Tran; Brent Waters (ACNS, 2017)

Full-Hiding (Unbounded) Multi-Input Inner Product Functional Encryption from the k-Linear Assumption. - Pratish Datta; Tatsuaki Okamoto; Junichi Tomida (IACR Cryptol. ePrint Arch., 2018)

Fully Secure Functional Encryption with a Large Class of Relations from the Decisional Linear Assumption. - Tatsuaki Okamoto; Katsuyuki Takashima (J. Cryptol., 2019)

Decentralized Attribute-Based Encryption and Signatures. - Tatsuaki Okamoto; Katsuyuki Takashima (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2020)

Efficient Inner Product Functional Encryption with Full-Hiding Security. - Junichi Tomida; Masayuki Abe; Tatsuaki Okamoto (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2020)

Adaptively Simulation-Secure Attribute-Hiding Predicate Encryption. - Pratish Datta; Tatsuaki Okamoto; Katsuyuki Takashima (IEICE Trans. Inf. Syst., 2020)

Efficient Attribute-Based Signatures for Unbounded Arithmetic Branching Programs. - Pratish Datta; Tatsuaki Okamoto; Katsuyuki Takashima (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2021)

A New Quantitative Definition of the Complexity of Organized Matters. - Tatsuaki Okamoto (Complex., 2022)

Standard model leakage-resilient authenticated key exchange using inner-product extractors. - Janaka Alawatugoda 001; Tatsuaki Okamoto (Des. Codes Cryptogr., 2022)

Stronger Security and Generic Constructions for Adaptor Signatures. - Wei Dai; Tatsuaki Okamoto; Go Yamamoto (IACR Cryptol. ePrint Arch., 2022)