Katsuyuki Takashima

According to our database, Katsuyuki Takashima authored at least 50 papers between 2004 and 2025.

Collaborative distances:

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

2025

On Lattice Isomorphism Problems for Lattices from LCD Codes over Finite Rings.

Yusaku Nishimura, Katsuyuki Takashima, Tsuyoshi Miezaki

CoRR, July, 2025

2022

Compact FE for Unbounded Attribute-Weighted Sums for Logspace from SXDH.

Pratish Datta, Tapas Pal, Katsuyuki Takashima

Proceedings of the Advances in Cryptology - ASIACRYPT 2022, 2022

2021

Improved supersingularity testing of elliptic curves.

Yuji Hashimoto, Katsuyuki Takashima

JSIAM Lett., 2021

Decomposed Richelot isogenies of Jacobian varieties of hyperelliptic curves and generalized Howe curves.

Toshiyuki Katsura, Katsuyuki Takashima

CoRR, 2021

Implementation Report of the Kohel-Lauter-Petit-Tignol Algorithm for the Constructive Deuring Correspondence.

Yuta Kambe, Yusuke Aikawa, Momonari Kudo, Masaya Yasuda, Katsuyuki Takashima, Kazuhiro Yokoyama

Proceedings of the Seventh International Conference on Mathematics and Computing, 2021

2020

Decentralized Attribute-Based Encryption and Signatures.

Tatsuaki Okamoto, Katsuyuki Takashima

IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2020

Counting superspecial Richelot isogenies and its cryptographic application.

Toshiyuki Katsura, Katsuyuki Takashima

CoRR, 2020

An Efficient Authenticated Key Exchange from Random Self-reducibility on CSIDH.

Tomoki Kawashima, Katsuyuki Takashima, Yusuke Aikawa, Tsuyoshi Takagi

Proceedings of the Information Security and Cryptology - ICISC 2020, 2020

Hybrid Meet-in-the-Middle Attacks for the Isogeny Path-Finding Problem.

Yasuhiko Ikematsu, Ryoya Fukasaku, Momonari Kudo, Masaya Yasuda, Katsuyuki Takashima, Kazuhiro Yokoyama

Proceedings of the 7th on ASIA Public-Key Cryptography Workshop, 2020

2019

Fully Secure Functional Encryption with a Large Class of Relations from the Decisional Linear Assumption.

Tatsuaki Okamoto, Katsuyuki Takashima

J. Cryptol., 2019

One-Round Authenticated Group Key Exchange from Isogenies.

Atsushi Fujioka, Katsuyuki Takashima, Kazuki Yoneyama

Proceedings of the Provable Security, 2019

Efficient Attribute-Based Signatures for Unbounded Arithmetic Branching Programs.

Pratish Datta, Tatsuaki Okamoto, Katsuyuki Takashima

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

Group Key Exchange from CSIDH and Its Application to Trusted Setup in Supersingular Isogeny Cryptosystems.

Tomoki Moriya, Katsuyuki Takashima, Tsuyoshi Takagi

Proceedings of the Information Security and Cryptology - 15th International Conference, 2019

2018

Multi-party Key Exchange Protocols from Supersingular Isogenies.

Satoshi Furukawa, Noboru Kunihiro, Katsuyuki Takashima

Proceedings of the International Symposium on Information Theory and Its Applications, 2018

New Assumptions on Isogenous Pairing Groups with Applications to Attribute-Based Encryption.

Takeshi Koshiba, Katsuyuki Takashima

Proceedings of the Information Security and Cryptology - ICISC 2018, 2018

Supersingular Isogeny Diffie-Hellman Authenticated Key Exchange.

Atsushi Fujioka, Katsuyuki Takashima, Shintaro Terada, Kazuki Yoneyama

Proceedings of the Information Security and Cryptology - ICISC 2018, 2018

Unbounded Inner Product Functional Encryption from Bilinear Maps.

Junichi Tomida, Katsuyuki Takashima

Proceedings of the Advances in Cryptology - ASIACRYPT 2018, 2018

Adaptively Simulation-Secure Attribute-Hiding Predicate Encryption.

Pratish Datta, Tatsuaki Okamoto, Katsuyuki Takashima

Proceedings of the Advances in Cryptology - ASIACRYPT 2018, 2018

2017

Constructing an efficient hash function from $3$-isogenies.

Hikari Tachibana, Katsuyuki Takashima, Tsuyoshi Takagi

JSIAM Lett., 2017

New Proof Techniques for DLIN-Based Adaptively Secure Attribute-Based Encryption.

Katsuyuki Takashima

Proceedings of the Information Security and Privacy - 22nd Australasian Conference, 2017

Efficient Algorithms for Isogeny Sequences and Their Cryptographic Applications.

Katsuyuki Takashima

Proceedings of the Mathematical Modelling for Next-Generation Cryptography: CREST Crypto-Math Project, 2017

2016

Pairing Cryptography Meets Isogeny: A New Framework of Isogenous Pairing Groups.

Takeshi Koshiba, Katsuyuki Takashima

IACR Cryptol. ePrint Arch., 2016

2015

Dual Pairing Vector Spaces and Their Applications.

Tatsuaki Okamoto, Katsuyuki Takashima

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

New Proof Techniques for DLIN-Based Adaptively Secure Attribute-Based Encryption and Their Application.

Katsuyuki Takashima

IACR Cryptol. ePrint Arch., 2015

Tighter Security for Efficient Lattice Cryptography via the Rényi Divergence of Optimized Orders.

Katsuyuki Takashima, Atsushi Takayasu

Proceedings of the Provable Security, 2015

2014

Heuristic counting of Kachisa-Schaefer-Scott curves.

Yutaro Kiyomura, Noriyasu Iwamoto, Shun'ichi Yokoyama, Kenichiro Hayasaka, Yuntao Wang, Takanori Yasuda, Katsuyuki Takashima, Tsuyoshi Takagi

JSIAM Lett., 2014

Expressive Attribute-Based Encryption with Constant-Size Ciphertexts from the Decisional Linear Assumption.

Katsuyuki Takashima

Proceedings of the Security and Cryptography for Networks - 9th International Conference, 2014

Recent Topics on Practical Functional Encryption.

Katsuyuki Takashima

Proceedings of the Second International Symposium on Computing and Networking, 2014

2013

Computing a Sequence of 2-Isogenies on Supersingular Elliptic Curves.

Reo Yoshida, Katsuyuki Takashima

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

Fully-Anonymous Functional Proxy-Re-Encryption.

Yutaka Kawai, Katsuyuki Takashima

IACR Cryptol. ePrint Arch., 2013

Decentralized Attribute-Based Signatures.

Tatsuaki Okamoto, Katsuyuki Takashima

Proceedings of the Public-Key Cryptography - PKC 2013 - 16th International Conference on Practice and Theory in Public-Key Cryptography, Nara, Japan, February 26, 2013

Predicate- and Attribute-Hiding Inner Product Encryption in a Public Key Setting.

Yutaka Kawai, Katsuyuki Takashima

Proceedings of the Pairing-Based Cryptography - Pairing 2013, 2013

2012

Provably-Secure Cancelable Biometrics Using 2-DNF Evaluation.

Mitsuhiro Hattori, Nori Matsuda, Takashi Ito, Yoichi Shibata, Katsuyuki Takashima, Takeshi Yoneda

Inf. Media Technol., 2012

Adaptively Attribute-Hiding (Hierarchical) Inner Product Encryption.

Tatsuaki Okamoto, Katsuyuki Takashima

Proceedings of the Advances in Cryptology - EUROCRYPT 2012, 2012

Fully Secure Unbounded Inner-Product and Attribute-Based Encryption.

Tatsuaki Okamoto, Katsuyuki Takashima

Proceedings of the Advances in Cryptology - ASIACRYPT 2012, 2012

2011

Efficient Attribute-Based Signatures for Non-monotone Predicates in the Standard Model.

Tatsuaki Okamoto, Katsuyuki Takashima

Proceedings of the Public Key Cryptography - PKC 2011, 2011

Achieving Short Ciphertexts or Short Secret-Keys for Adaptively Secure General Inner-Product Encryption.

Tatsuaki Okamoto, Katsuyuki Takashima

Proceedings of the Cryptology and Network Security - 10th International Conference, 2011

Some Key Techniques on Pairing Vector Spaces.

Tatsuaki Okamoto, Katsuyuki Takashima

Proceedings of the Progress in Cryptology - AFRICACRYPT 2011, 2011

2010

Fully Secure Functional Encryption: Attribute-Based Encryption and (Hierarchical) Inner Product Encryption.

Allison B. Lewko, Tatsuaki Okamoto, Amit Sahai, Katsuyuki Takashima, Brent Waters

Proceedings of the Advances in Cryptology - EUROCRYPT 2010, 29th Annual International Conference on the Theory and Applications of Cryptographic Techniques, Monaco / French Riviera, May 30, 2010

Fully Secure Functional Encryption with General Relations from the Decisional Linear Assumption.

Tatsuaki Okamoto, Katsuyuki Takashima

Proceedings of the Advances in Cryptology, 2010

2009

Hierarchical Predicate Encryption for Inner-Products.

Tatsuaki Okamoto, Katsuyuki Takashima

Proceedings of the Advances in Cryptology, 2009

2008

Homomorphic Encryption and Signatures from Vector Decomposition.

Tatsuaki Okamoto, Katsuyuki Takashima

Proceedings of the Pairing-Based Cryptography, 2008

Simple Algorithms for Computing a Sequence of 2-Isogenies.

Reo Yoshida, Katsuyuki Takashima

Proceedings of the Information Security and Cryptology, 2008

Efficiently Computable Distortion Maps for Supersingular Curves.

Katsuyuki Takashima

Proceedings of the Algorithmic Number Theory, 8th International Symposium, 2008

2007

Scaling Security of Elliptic Curves with Fast Pairing Using Efficient Endomorphisms.

Katsuyuki Takashima

IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2007

2006

Practical Application of Lattice Basis Reduction Algorithm to Side-Channel Analysis on (EC)DSA.

Katsuyuki Takashima

IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2006

A New Type of Fast Endomorphisms on Jacobians of Hyperelliptic Curves and Their Cryptographic Application.

Katsuyuki Takashima

IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2006

2005

Practical Modifications of Leadbitter et al.'s Repeated-Bits Side-Channel Analysis on (EC)DSA.

Katsuyuki Takashima

Proceedings of the Information Security Applications, 6th International Workshop, 2005

2004

New Families of Hyperelliptic Curves with Efficient Gallant-Lambert-Vanstone Method.

Katsuyuki Takashima

Proceedings of the Information Security and Cryptology, 2004