Ryo Nishimaki

According to our database, Ryo Nishimaki authored at least 64 papers between 2008 and 2023.

Collaborative distances:

• Dijkstra number of four.
• Erdős number of four.

2023

Compact Structure-Preserving Signatures with Almost Tight Security.

Masayuki Abe, Dennis Hofheinz, Ryo Nishimaki, Miyako Ohkubo, Jiaxin Pan

J. Cryptol., October, 2023

Publicly Verifiable Deletion from Minimal Assumptions.

Fuyuki Kitagawa, Ryo Nishimaki, Takashi Yamakawa

IACR Cryptol. ePrint Arch., 2023

One-out-of-Many Unclonable Cryptography: Definitions, Constructions, and More.

Fuyuki Kitagawa, Ryo Nishimaki

IACR Cryptol. ePrint Arch., 2023

Quantum Public-Key Encryption with Tamper-Resilient Public Keys from One-Way Functions.

Fuyuki Kitagawa, Tomoyuki Morimae, Ryo Nishimaki, Takashi Yamakawa

IACR Cryptol. ePrint Arch., 2023

Robust Combiners and Universal Constructions for Quantum Cryptography.

Taiga Hiroka, Fuyuki Kitagawa, Ryo Nishimaki, Takashi Yamakawa

IACR Cryptol. ePrint Arch., 2023

Certified Everlasting Secure Collusion-Resistant Functional Encryption, and More.

Taiga Hiroka, Fuyuki Kitagawa, Tomoyuki Morimae, Ryo Nishimaki, Tapas Pal, Takashi Yamakawa

IACR Cryptol. ePrint Arch., 2023

Obfuscation of Pseudo-Deterministic Quantum Circuits.

James Bartusek, Fuyuki Kitagawa, Ryo Nishimaki, Takashi Yamakawa

IACR Cryptol. ePrint Arch., 2023

Public Key Encryption with Secure Key Leasing.

Shweta Agrawal, Fuyuki Kitagawa, Ryo Nishimaki, Shota Yamada, Takashi Yamakawa

IACR Cryptol. ePrint Arch., 2023

2022

Obfustopia Built on Secret-Key Functional Encryption.

Fuyuki Kitagawa, Ryo Nishimaki, Keisuke Tanaka

J. Cryptol., 2022

Functional Encryption with Secure Key Leasing.

Fuyuki Kitagawa, Ryo Nishimaki

IACR Cryptol. ePrint Arch., 2022

Watermarking PRFs against Quantum Adversaries.

Fuyuki Kitagawa, Ryo Nishimaki

IACR Cryptol. ePrint Arch., 2022

Certified Everlasting Functional Encryption.

Taiga Hiroka, Tomoyuki Morimae, Ryo Nishimaki, Takashi Yamakawa

IACR Cryptol. ePrint Arch., 2022

Bounded Functional Encryption for Turing Machines: Adaptive Security from General Assumptions.

Shweta Agrawal, Fuyuki Kitagawa, Anuja Modi, Ryo Nishimaki, Shota Yamada, Takashi Yamakawa

IACR Cryptol. ePrint Arch., 2022

Cryptanalysis of Boyen's attribute-based encryption scheme in TCC 2013.

Shweta Agrawal, Rajarshi Biswas, Ryo Nishimaki, Keita Xagawa, Xiang Xie, Shota Yamada

Des. Codes Cryptogr., 2022

2021

Simple and Generic Constructions of Succinct Functional Encryption.

Fuyuki Kitagawa, Ryo Nishimaki, Keisuke Tanaka

J. Cryptol., 2021

Compact Designated Verifier NIZKs from the CDH Assumption Without Pairings.

Shuichi Katsumata, Ryo Nishimaki, Shota Yamada, Takashi Yamakawa

J. Cryptol., 2021

Quantum Encryption with Certified Deletion: Public Key and Attribute-Based.

Ryo Nishimaki, Takashi Yamakawa

IACR Cryptol. ePrint Arch., 2021

The Direction of Updatable Encryption Does Matter.

Ryo Nishimaki

IACR Cryptol. ePrint Arch., 2021

KDM Security for the Fujisaki-Okamoto Transformations in the QROM.

Fuyuki Kitagawa, Ryo Nishimaki

IACR Cryptol. ePrint Arch., 2021

Round-Optimal Blind Signatures in the Plain Model from Classical and Quantum Standard Assumptions.

Shuichi Katsumata, Ryo Nishimaki, Shota Yamada, Takashi Yamakawa

IACR Cryptol. ePrint Arch., 2021

Certified Everlasting Zero-Knowledge Proof for QMA.

Taiga Hiroka, Tomoyuki Morimae, Ryo Nishimaki, Takashi Yamakawa

IACR Cryptol. ePrint Arch., 2021

Quantum Encryption with Certified Deletion, Revisited: Public Key, Attribute-Based, and Classical Communication.

Taiga Hiroka, Tomoyuki Morimae, Ryo Nishimaki, Takashi Yamakawa

IACR Cryptol. ePrint Arch., 2021

Fast, compact, and expressive attribute-based encryption.

Junichi Tomida, Yuto Kawahara, Ryo Nishimaki

Des. Codes Cryptogr., 2021

2020

From Cryptomania to Obfustopia Through Secret-Key Functional Encryption.

Nir Bitansky, Ryo Nishimaki, Alain Passelègue, Daniel Wichs

J. Cryptol., 2020

Equipping Public-Key Cryptographic Primitives with Watermarking (or: A Hole Is to Watermark).

Ryo Nishimaki

IACR Cryptol. ePrint Arch., 2020

Secure Software Leasing from Standard Assumptions.

Fuyuki Kitagawa, Ryo Nishimaki, Takashi Yamakawa

IACR Cryptol. ePrint Arch., 2020

Adaptively Secure Inner Product Encryption from LWE.

Shuichi Katsumata, Ryo Nishimaki, Shota Yamada, Takashi Yamakawa

IACR Cryptol. ePrint Arch., 2020

Compact NIZKs from Standard Assumptions on Bilinear Maps.

Shuichi Katsumata, Ryo Nishimaki, Shota Yamada, Takashi Yamakawa

IACR Cryptol. ePrint Arch., 2020

Adaptively Secure Constrained Pseudorandom Functions in the Standard Model.

Alex Davidson, Shuichi Katsumata, Ryo Nishimaki, Shota Yamada, Takashi Yamakawa

IACR Cryptol. ePrint Arch., 2020

2019

How to Watermark Cryptographic Functions by Bilinear Maps.

Ryo Nishimaki

IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2019

Leakage-resilient Identity-based Encryption in Bounded Retrieval Model with Nearly Optimal Leakage-Ratio.

Ryo Nishimaki, Takashi Yamakawa

IACR Cryptol. ePrint Arch., 2019

Designated Verifier/Prover and Preprocessing NIZKs from Diffie-Hellman Assumptions.

Shuichi Katsumata, Ryo Nishimaki, Shota Yamada, Takashi Yamakawa

IACR Cryptol. ePrint Arch., 2019

Exploring Constructions of Compact NIZKs from Various Assumptions.

Shuichi Katsumata, Ryo Nishimaki, Shota Yamada, Takashi Yamakawa

IACR Cryptol. ePrint Arch., 2019

Adaptively Single-Key Secure Constrained PRFs for \mathrm NC^1.

Nuttapong Attrapadung, Takahiro Matsuda, Ryo Nishimaki, Shota Yamada, Takashi Yamakawa

Proceedings of the Public-Key Cryptography - PKC 2019, 2019

2018

Adaptively Secure and Succinct Functional Encryption: Improving Security and Efficiency, Simultaneously.

Fuyuki Kitagawa, Ryo Nishimaki, Keisuke Tanaka, Takashi Yamakawa

IACR Cryptol. ePrint Arch., 2018

Universal Proxy Re-Encryption.

Nico Döttling, Ryo Nishimaki

IACR Cryptol. ePrint Arch., 2018

A Bit-fixing PRF with O(1) Collusion-Resistance from LWE.

Alex Davidson, Ryo Nishimaki

IACR Cryptol. ePrint Arch., 2018

Constrained PRFs for Bit-fixing from OWFs with Constant Collusion Resistance.

Alex Davidson, Shuichi Katsumata, Ryo Nishimaki, Shota Yamada

IACR Cryptol. ePrint Arch., 2018

Adaptively Single-Key Secure Constrained PRFs for NC1.

Nuttapong Attrapadung, Takahiro Matsuda, Ryo Nishimaki, Shota Yamada, Takashi Yamakawa

IACR Cryptol. ePrint Arch., 2018

Constrained PRFs for NC1 in Traditional Groups.

Nuttapong Attrapadung, Takahiro Matsuda, Ryo Nishimaki, Shota Yamada, Takashi Yamakawa

IACR Cryptol. ePrint Arch., 2018

Constrained PRFs for \mathrmNC^1 in Traditional Groups.

Nuttapong Attrapadung, Takahiro Matsuda, Ryo Nishimaki, Shota Yamada, Takashi Yamakawa

Proceedings of the Advances in Cryptology - CRYPTO 2018, 2018

2017

From Single-Key to Collusion-Resistant Secret-Key Functional Encryption by Leveraging Succinctness.

Fuyuki Kitagawa, Ryo Nishimaki, Keisuke Tanaka

IACR Cryptol. ePrint Arch., 2017

Indistinguishability Obfuscation for All Circuits from Secret-Key Functional Encryption.

Fuyuki Kitagawa, Ryo Nishimaki, Keisuke Tanaka

IACR Cryptol. ePrint Arch., 2017

Indistinguishability Obfuscation: Simpler Constructions using Secret-Key Functional Encryption.

Fuyuki Kitagawa, Ryo Nishimaki, Keisuke Tanaka

IACR Cryptol. ePrint Arch., 2017

2016

Constant-Size Structure-Preserving Signatures: Generic Constructions and Simple Assumptions.

Masayuki Abe, Melissa Chase, Bernardo David, Markulf Kohlweiss, Ryo Nishimaki, Miyako Ohkubo

J. Cryptol., 2016

Watermarking Cryptographic Programs.

Ryo Nishimaki

Proceedings of the Paradigms in Cryptology - Mycrypt 2016. Malicious and Exploratory Cryptology, 2016

2015

Key-Private Proxy Re-Encryption from Lattices, Revisited.

Ryo Nishimaki, Keita Xagawa

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

Post-Challenge Leakage Resilient Public-Key Cryptosystem in Split State Model.

Eiichiro Fujisaki, Akinori Kawachi, Ryo Nishimaki, Keisuke Tanaka, Kenji Yasunaga

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

Anonymous Traitor Tracing: How to Embed Arbitrary Information in a Key.

Ryo Nishimaki, Daniel Wichs, Mark Zhandry

IACR Cryptol. ePrint Arch., 2015

Watermarking Cryptographic Programs Against Arbitrary Removal Strategies.

Ryo Nishimaki, Daniel Wichs

IACR Cryptol. ePrint Arch., 2015

Generalizing Efficient Multiparty Computation.

Bernardo David, Ryo Nishimaki, Samuel Ranellucci, Alain Tapp

IACR Cryptol. ePrint Arch., 2015

Watermarking Cryptographic Capabilities.

Aloni Cohen, Justin Holmgren, Ryo Nishimaki, Vinod Vaikuntanathan, Daniel Wichs

IACR Cryptol. ePrint Arch., 2015

Re-encryption, functional re-encryption, and multi-hop re-encryption: A framework for achieving obfuscation-based security and instantiations from lattices.

Nishanth Chandran, Melissa Chase, Feng-Hao Liu, Ryo Nishimaki, Keita Xagawa

IACR Cryptol. ePrint Arch., 2015

Tagged One-Time Signatures: Tight Security and Optimal Tag Size.

Masayuki Abe, Bernardo David, Markulf Kohlweiss, Ryo Nishimaki, Miyako Ohkubo

IACR Cryptol. ePrint Arch., 2015

Verifiably encrypted signatures with short keys based on the decisional linear problem and obfuscation for encrypted VES.

Ryo Nishimaki, Keita Xagawa

Des. Codes Cryptogr., 2015

2014

How to Watermark Cryptographic Functions.

Ryo Nishimaki

IACR Cryptol. ePrint Arch., 2014

2013

Universally composable adaptive oblivious transfer (with access control) from standard assumptions.

Masayuki Abe, Jan Camenisch, Maria Dubovitskaya, Ryo Nishimaki

Proceedings of the DIM'13, 2013

2012

A Multi-Trapdoor Commitment Scheme from the RSA Assumption.

Ryo Nishimaki, Eiichiro Fujisaki, Keisuke Tanaka

IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2012

An Efficient Non-interactive Universally Composable String-Commitment Scheme.

Ryo Nishimaki, Eiichiro Fujisaki, Keisuke Tanaka

IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2012

2010

CCA Proxy Re-Encryption without Bilinear Maps in the Standard Model.

Toshihide Matsuda, Ryo Nishimaki, Keisuke Tanaka

Proceedings of the Public Key Cryptography, 2010

2009

Efficient Non-interactive Universally Composable String-Commitment Schemes.

Ryo Nishimaki, Eiichiro Fujisaki, Keisuke Tanaka

Proceedings of the Provable Security, Third International Conference, 2009

On the Insecurity of the Fiat-Shamir Signatures with Iterative Hash Functions.

Eiichiro Fujisaki, Ryo Nishimaki, Keisuke Tanaka

Proceedings of the Provable Security, Third International Conference, 2009

Security on Hybrid Encryption with the Tag-KEM/DEM Framework.

Toshihide Matsuda, Ryo Nishimaki, Akira Numayama, Keisuke Tanaka

Proceedings of the Information Security and Privacy, 14th Australasian Conference, 2009

2008

Universally Composable Identity-Based Encryption.

Ryo Nishimaki, Yoshifumi Manabe, Tatsuaki Okamoto

IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2008