The Multi-variable Modular Polynomial and Its Applications to Cryptography. - Tsuyoshi Takagi; Shozo Naito (ISAAC, 1996)

Fast RSA-Type Cryptosystems Using N-Adic Expansion. - Tsuyoshi Takagi (CRYPTO, 1997)

Fast RSA-Type Cryptosystem Modulo pkq. - Tsuyoshi Takagi (CRYPTO, 1998)

A Cryptosystem Based on Non-maximal Imaginary Quadratic Orders with Fast Decryption. - Detlef Hühnlein; Michael J. Jacobson Jr.; Sachar Paulus; Tsuyoshi Takagi (EUROCRYPT, 1998)

Rabin and RSA analogues based on non-maximal imaginary quadratic orders. - Detlef Hühnlein; Andreas Meyer 003; Tsuyoshi Takagi (ICISC, 1998)

A generalization of the Diffie-Hellman problem and related cryptosystems allowing fast decryption. - Sachar Paulus; Tsuyoshi Takagi (ICISC, 1998)

Reducing Logarithms in Totally Non-maximal Imaginary Quadratic Orders to Logarithms in Finite Fields. - Detlef Hühnlein; Tsuyoshi Takagi (ASIACRYPT, 1999)

NICE - New Ideal Coset Encryption. - Michael Hartmann; Sachar Paulus; Tsuyoshi Takagi (CHES, 1999)

A New Public-Key Cryptosystem over a Quadratic Order with Quadratic Decryption Time. - Sachar Paulus; Tsuyoshi Takagi (J. Cryptol., 2000)

Architecture and preliminary experimental results for emotionally grounded symbol acquisition. - Masahiro Fujita; Gabriel Costa; Rika Hasegawa; Tsuyoshi Takagi; Jun Yokono; Hideki Shimomura (Agents, 2001)

An IND-CCA2 Public-Key Cryptosystem with Fast Decryption. - Johannes Buchmann 001; Kouichi Sakurai; Tsuyoshi Takagi (ICISC, 2001)

Ethological Modeling and Architecture for an Entertainment Robot. - Ronald C. Arkin; Masahiro Fujita; Tsuyoshi Takagi; Rika Hasegawa (ICRA, 2001)

How to Choose Secret Parameters for RSA-Type Cryptosystems over Elliptic Curves. - Marc Joye; Jean-Jacques Quisquater; Tsuyoshi Takagi (Des. Codes Cryptogr., 2001)

New public-key cryptosystems with fast decryption. - Tsuyoshi Takagi (2001)

A New Distributed Primality Test for Shared RSA Keys Using Quadratic Fields. - Ingrid Biehl; Tsuyoshi Takagi (ACISP, 2002)

On the Security of a Modified Paillier Public-Key Primitive. - Kouichi Sakurai; Tsuyoshi Takagi (ACISP, 2002)

Efficient Computations of the Tate Pairingfor the Large MOV Degrees. - Tetsuya Izu; Tsuyoshi Takagi (ICISC, 2002)

A Reject Timing Attackon an IND-CCA2 Public-Key Cryptosystem. - Kouichi Sakurai; Tsuyoshi Takagi (ICISC, 2002)

Improved Elliptic Curve Multiplication Methods Resistant against Side Channel Attacks. - Tetsuya Izu; Bodo Möller; Tsuyoshi Takagi (INDOCRYPT, 2002)

A Fast Parallel Elliptic Curve Multiplication Resistant against Side Channel Attacks. - Tetsuya Izu; Tsuyoshi Takagi (Public Key Cryptography, 2002)

New Semantically Secure Public-Key Cryptosystems from the RSA-Primitive. - Kouichi Sakurai; Tsuyoshi Takagi (Public Key Cryptography, 2002)

A Complete and Explicit Security Reduction Algorithm for RSA-Based Cryptosystems. - Kaoru Kurosawa; Katja Schmidt-Samoa; Tsuyoshi Takagi (ASIACRYPT, 2003)

A More Flexible Countermeasure against Side Channel Attacks Using Window Method. - Katsuyuki Okeya; Tsuyoshi Takagi (CHES, 2003)

The Width-w NAF Method Provides Small Memory and Fast Elliptic Scalar Multiplications Secure against Side Channel Attacks. - Katsuyuki Okeya; Tsuyoshi Takagi (CT-RSA, 2003)

Zero-Value Point Attacks on Elliptic Curve Cryptosystem. - Toru Akishita; Tsuyoshi Takagi (ISC, 2003)

Exceptional Procedure Attack on Elliptic Curve Cryptosystems. - Tetsuya Izu; Tsuyoshi Takagi (Public Key Cryptography, 2003)

Novel Efficient Implementations of Hyperelliptic Curve Cryptosystems using Degenerate Divisors. - Masanobu Katagi; Izuru Kitamura; Toru Akishita; Tsuyoshi Takagi (IACR Cryptol. ePrint Arch., 2003)

Some RSA-based Encryption Schemes with Tight Security Reduction. - Kaoru Kurosawa; Tsuyoshi Takagi (IACR Cryptol. ePrint Arch., 2003)

An ethological and emotional basis for human-robot interaction. - Ronald C. Arkin; Masahiro Fujita; Tsuyoshi Takagi; Rika Hasegawa (Robotics Auton. Syst., 2003)

On the Exact Flexibility of the Flexible Countermeasure Against Side Channel Attacks. - Katsuyuki Okeya; Tsuyoshi Takagi; Camille Vuillaume (ACISP, 2004)

Learning behavior selection through interaction based on emotionally grounded symbol concept. - Tsutomu Sawada; Tsuyoshi Takagi; Yukiko Hoshino; Masahiro Fujita (Humanoids, 2004)

Some Improved Algorithms for Hyperelliptic Curve Cryptosystems Using Degenerate Divisors. - Masanobu Katagi; Toru Akishita; Izuru Kitamura; Tsuyoshi Takagi (ICISC, 2004)

Behavior Description and Control using Behavior Module for Personal Robot. - Yukiko Hoshino; Tsuyoshi Takagi; Ugo Di Profio; Masahiro Fujita (ICRA, 2004)

A Provably Secure Elliptic Curve Scheme with Fast Encryption. - David Galindo; Sebastià Martín Molleví; Tsuyoshi Takagi; Jorge Luis Villar (INDOCRYPT, 2004)

Exact Analysis of Montgomery Multiplication. - Hisayoshi Sato; Daniel Schepers; Tsuyoshi Takagi (INDOCRYPT, 2004)

Behavior selection and motion modulation in emotionally grounded architecture for QRIO SDR-4XII. - Tsutomu Sawada; Tsuyoshi Takagi; Masahiro Fujita (IROS, 2004)

Radix-r Non-Adjacent Form. - Tsuyoshi Takagi; Sung-Ming Yen; Bo-Ching Wu (ISC, 2004)

On the Importance of Protecting Delta in SFLASH against Side Channel Attacks. - Katsuyuki Okeya; Tsuyoshi Takagi; Camille Vuillaume (ITCC (2), 2004)

Efficient Undeniable Signature Schemes Based on Ideal Arithmetic in Quadratic Orders. - Ingrid Biehl; Sachar Paulus; Tsuyoshi Takagi (Des. Codes Cryptogr., 2004)

A Complete Divisor Class Halving Algorithm for Hyperelliptic Curve Cryptosystems of Genus Two. - Izuru Kitamura; Masanobu Katagi; Tsuyoshi Takagi (IACR Cryptol. ePrint Arch., 2004)

Signed Binary Representations Revisited. - Katsuyuki Okeya; Katja Schmidt-Samoa; Christian Spahn; Tsuyoshi Takagi (IACR Cryptol. ePrint Arch., 2004)

Fast Elliptic Curve Multiplications with SIMD Operations. - Tetsuya Izu; Tsuyoshi Takagi (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2004)

SCA-Resistant and Fast Elliptic Scalar Multiplication Based on wNAF. - Katsuyuki Okeya; Tsuyoshi Takagi (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2004)

A Fast RSA-Type Public-Key Primitive Modulo pkq Using Hensel Lifting. - Tsuyoshi Takagi (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2004)

Efficient Representations on Koblitz Curves with Resistance to Side Channel Attacks. - Katsuyuki Okeya; Tsuyoshi Takagi; Camille Vuillaume (ACISP, 2005)

An id-based non-interactive tripartite key agreement protocol with K-resilience. - Raylin Tso; Takeshi Okamoto; Tsuyoshi Takagi; Eiji Okamoto (Communications and Computer Networks, 2005)

Insider Impersonation-MIM Attack to Tripartite Key Agreement Scheme and an Efficient Protocol for Multiple Keys. - Lihua Wang 001; Takeshi Okamoto; Tsuyoshi Takagi; Eiji Okamoto (CIS (2), 2005)

An Advanced Method for Joint Scalar Multiplications on Memory Constraint Devices. - Erik Dahmen; Katsuyuki Okeya; Tsuyoshi Takagi (ESAS, 2005)

Paillier's Cryptosystem Modulo p2q and Its Applications to Trapdoor Commitment Schemes. - Katja Schmidt-Samoa; Tsuyoshi Takagi (Mycrypt, 2005)

Efficient Arithmetic on Subfield Elliptic Curves over Small Odd Characteristics. - Keisuke Hakuta; Hisayoshi Sato; Tsuyoshi Takagi (IACR Cryptol. ePrint Arch., 2005)

Some Explicit Formulae of NAF and its Left-to-Right Analogue. - Dong-Guk Han; Tetsuya Izu; Tsuyoshi Takagi (IACR Cryptol. ePrint Arch., 2005)

Some Analysis of Radix-r Representations. - Dong-Guk Han; Tsuyoshi Takagi (IACR Cryptol. ePrint Arch., 2005)

Collision Attack on XTR and a Countermeasure with a Fixed Pattern. - Dong-Guk Han; Tsuyoshi Takagi; Tae Hyun Kim 003; Ho Won Kim 001; Kyoil Chung (IACR Cryptol. ePrint Arch., 2005)

Zero-Value Register Attack on Elliptic Curve Cryptosystem. - Toru Akishita; Tsuyoshi Takagi (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2005)

On the Optimal Parameter Choice for Elliptic Curve Cryptosystems Using Isogeny. - Toru Akishita; Tsuyoshi Takagi (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2005)

Fast Elliptic Curve Multiplications Resistant against Side Channel Attacks. - Tetsuya Izu; Tsuyoshi Takagi (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2005)

On the Importance of Protecting in SFLASH against Side Channel Attacks. - Katsuyuki Okeya; Tsuyoshi Takagi; Camille Vuillaume (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2005)

New Approach for Selectively Convertible Undeniable Signature Schemes. - Kaoru Kurosawa; Tsuyoshi Takagi (ASIACRYPT, 2006)

Power Analysis to ECC Using Differential Power Between Multiplication and Squaring. - Toru Akishita; Tsuyoshi Takagi (CARDIS, 2006)

An Efficient and Secure RFID Security Method with Ownership Transfer. - Kyosuke Osaka; Tsuyoshi Takagi; Kenichi Yamazaki; Osamu Takahashi (CIS, 2006)

New Security Problem in RFID Systems "Tag Killing". - Dong-Guk Han; Tsuyoshi Takagi; Howon Kim 001; Kyoil Chung (ICCSA (3), 2006)

Further Security Analysis of XTR. - Dong-Guk Han; Tsuyoshi Takagi; Jongin Lim 001 (ISPEC, 2006)

An Algorithm for the ηT Pairing Calculation in Characteristic Three and its Hardware Implementation. - Jean-Luc Beuchat; Masaaki Shirase; Tsuyoshi Takagi; Eiji Okamoto (IACR Cryptol. ePrint Arch., 2006)

Efficient Implementation of Tate Pairing on a Mobile Phone using Java. - Yuto Kawahara; Tsuyoshi Takagi; Eiji Okamoto (IACR Cryptol. ePrint Arch., 2006)

Side Channel Attacks and Countermeasures on Pairing Based Cryptosystems over Binary Fields. - Tae Hyun Kim 003; Tsuyoshi Takagi; Dong-Guk Han; Ho Won Kim 001; Jongin Lim 001 (IACR Cryptol. ePrint Arch., 2006)

Some Efficient Algorithms for the Final Exponentiation of ηT Pairing. - Masaaki Shirase; Tsuyoshi Takagi; Eiji Okamoto (IACR Cryptol. ePrint Arch., 2006)

Efficient Hyperelliptic Curve Cryptosystems Using Theta Divisors. - Masanobu Katagi; Toru Akishita; Izuru Kitamura; Tsuyoshi Takagi (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2006)

Security Analysis of the SPA-Resistant Fractional Width Method. - Katsuyuki Okeya; Tsuyoshi Takagi; Camille Vuillaume (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2006)

Generalized Powering Functions and Their Application to Digital Signatures. - Hisayoshi Sato; Tsuyoshi Takagi; Satoru Tezuka; Kazuo Takaragi (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2006)

Radix-r Non-Adjacent Form and Its Application to Pairing-Based Cryptosystem. - Tsuyoshi Takagi; David Reis Jr.; Sung-Ming Yen; Bo-Ching Wu (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2006)

Defeating Simple Power Analysis on Koblitz Curves. - Camille Vuillaume; Katsuyuki Okeya; Tsuyoshi Takagi (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2006)

Security analysis of CRT-based cryptosystems. - Katsuyuki Okeya; Tsuyoshi Takagi (Int. J. Inf. Sec., 2006)

Analysis of Fractional Window Recoding Methods and Their Application to Elliptic Curve Cryptosystems. - Katja Schmidt-Samoa; Olivier Semay; Tsuyoshi Takagi (IEEE Trans. Computers, 2006)

Compressed XTR. - Masaaki Shirase; Dong-Guk Han; Yasushi Hibino; Ho Won Kim 001; Tsuyoshi Takagi (ACNS, 2007)

Efficient Conjunctive Keyword-Searchable Encryption. - Eun-Kyung Ryu; Tsuyoshi Takagi (AINA Workshops (1), 2007)

Privacy-Preserving Two-Party K-Means Clustering via Secure Approximation. - Chunhua Su; Feng Bao 001; Jianying Zhou 001; Tsuyoshi Takagi; Kouichi Sakurai (AINA Workshops (1), 2007)

An Algorithm for the nt Pairing Calculation in Characteristic Three and its Hardware Implementation. - Jean-Luc Beuchat; Masaaki Shirase; Tsuyoshi Takagi; Eiji Okamoto (IEEE Symposium on Computer Arithmetic, 2007)

Some Efficient Algorithms for the Final Exponentiation of eta T Pairing. - Masaaki Shirase; Tsuyoshi Takagi; Eiji Okamoto (ISPEC, 2007)

Two-Party Privacy-Preserving Agglomerative Document Clustering. - Chunhua Su; Jianying Zhou 001; Feng Bao 001; Tsuyoshi Takagi; Kouichi Sakurai (ISPEC, 2007)

A Coprocessor for the Final Exponentiation of the eta T Pairing in Characteristic Three. - Jean-Luc Beuchat; Nicolas Brisebarre; Masaaki Shirase; Tsuyoshi Takagi; Eiji Okamoto (WAIFI, 2007)

Universal etaT Pairing Algorithm over Arbitrary Extension Degree. - Masaaki Shirase; Yuto Kawahara; Tsuyoshi Takagi; Eiji Okamoto (WISA, 2007)

Algorithms and Arithmetic Operators for Computing the etaT Pairing in Characteristic Three. - Jean-Luc Beuchat; Nicolas Brisebarre; Jérémie Detrey; Eiji Okamoto; Masaaki Shirase; Tsuyoshi Takagi (IACR Cryptol. ePrint Arch., 2007)

A Coprocessor for the Final Exponentiation of the etaT Pairing in Characteristic Three. - Jean-Luc Beuchat; Nicolas Brisebarre; Masaaki Shirase; Tsuyoshi Takagi; Eiji Okamoto (IACR Cryptol. ePrint Arch., 2007)

A Refined Algorithm for the etaT Pairing Calculation in Characteristic Three. - Jean-Luc Beuchat; Masaaki Shirase; Tsuyoshi Takagi; Eiji Okamoto (IACR Cryptol. ePrint Arch., 2007)

A New Upper Bound for the Minimal Density of Joint Representations in Elliptic Curve Cryptosystems. - Erik Dahmen; Katsuyuki Okeya; Tsuyoshi Takagi (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2007)

A Secure RFID Protocol based on Insubvertible Encryption Using Guardian Proxy. - Kyosuke Osaka; Shuang Chang; Tsuyoshi Takagi; Kenichi Yamazaki; Osamu Takahashi (ARES, 2008)

A New Scheme for Distributed Density Estimation based Privacy-Preserving Clustering. - Chunhua Su; Feng Bao 001; Jianying Zhou 001; Tsuyoshi Takagi; Kouichi Sakurai (ARES, 2008)

On the Security of Online/Offline Signatures and Multisignatures from ACISP'06. - Fagen Li; Masaaki Shirase; Tsuyoshi Takagi (CANS, 2008)

Efficient Signcryption Key Encapsulation without Random Oracles. - Fagen Li; Masaaki Shirase; Tsuyoshi Takagi (Inscrypt, 2008)

Efficient Multi-PKG ID-Based Signcryption for Ad Hoc Networks. - Fagen Li; Masaaki Shirase; Tsuyoshi Takagi (Inscrypt, 2008)

An Efficient Countermeasure against Side Channel Attacks for Pairing Computation. - Masaaki Shirase; Tsuyoshi Takagi; Eiji Okamoto (ISPEC, 2008)

Network Forensics on Mobile Ad-Hoc Networks. - Akira Otaka; Tsuyoshi Takagi; Osamu Takahashi (KES (3), 2008)

Key Management Using Certificateless Public Key Cryptography in Ad Hoc Networks. - Fagen Li; Masaaki Shirase; Tsuyoshi Takagi (NPC, 2008)

Faster Implementation of eta-T Pairing over GF(3m) Using Minimum Number of Logical Instructions for GF(3)-Addition. - Yuto Kawahara; Kazumaro Aoki; Tsuyoshi Takagi (Pairing, 2008)

Digital Signatures Out of Second-Preimage Resistant Hash Functions. - Erik Dahmen; Katsuyuki Okeya; Tsuyoshi Takagi; Camille Vuillaume (PQCrypto, 2008)

Analysis and Improvement of Authenticatable Ring Signcryption Scheme. - Fagen Li; Masaaki Shirase; Tsuyoshi Takagi (IACR Cryptol. ePrint Arch., 2008)

Reduction Optimal Trinomials for Efficient Software Implementation of the etaT Pairing. - Toshiya Nakajima; Tetsuya Izu; Tsuyoshi Takagi (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2008)

A More Compact Representation of XTR Cryptosystem. - Masaaki Shirase; Dong-Guk Han; Yasushi Hibino; Howon Kim 001; Tsuyoshi Takagi (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2008)

Some Efficient Algorithms for the Final Exponentiation of etaT Pairing. - Masaaki Shirase; Tsuyoshi Takagi; Eiji Okamoto (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2008)

Efficient Implementation of the Pairing on Mobilephones Using BREW. - Motoi Yoshitomi; Tsuyoshi Takagi; Shinsaku Kiyomoto; Toshiaki Tanaka (IEICE Trans. Inf. Syst., 2008)

Algorithms and Arithmetic Operators for Computing the etaT Pairing in Characteristic Three. - Jean-Luc Beuchat; Nicolas Brisebarre; Jérémie Detrey; Eiji Okamoto; Masaaki Shirase; Tsuyoshi Takagi (IEEE Trans. Computers, 2008)

Short-Memory Scalar Multiplication for Koblitz Curves. - Camille Vuillaume; Katsuyuki Okeya; Tsuyoshi Takagi (IEEE Trans. Computers, 2008)

An Efficient Residue Group Multiplication for the etaT Pairing over F3m. - Yuta Sasaki; Satsuki Nishina; Masaaki Shirase; Tsuyoshi Takagi (Selected Areas in Cryptography, 2009)

A hybrid approach for privacy-preserving RFID tags. - Eun-Kyung Ryu; Tsuyoshi Takagi (Comput. Stand. Interfaces, 2009)

Identity-Based Hybrid Signcryption. - Fagen Li; Masaaki Shirase; Tsuyoshi Takagi (IACR Cryptol. ePrint Arch., 2009)

Efficient Implementation of Pairing-Based Cryptography on a Sensor Node. - Masaaki Shirase; Yukinori Miyazaki; Tsuyoshi Takagi; Dong-Guk Han; Dooho Choi (IEICE Trans. Inf. Syst., 2009)

Security and Correctness Analysis on Privacy-Preserving k-Means Clustering Schemes. - Chunhua Su; Feng Bao 001; Jianying Zhou 001; Tsuyoshi Takagi; Kouichi Sakurai (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2009)

Distributed Noise Generation for Density Estimation Based Clustering without Trusted Third Party. - Chunhua Su; Feng Bao 001; Jianying Zhou 001; Tsuyoshi Takagi; Kouichi Sakurai (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2009)

One-wayness equivalent to general factoring. - Kaoru Kurosawa; Tsuyoshi Takagi (IEEE Trans. Inf. Theory, 2009)

Efficient Implementation of Pairing on BREW Mobile Phones. - Tadashi Iyama; Shinsaku Kiyomoto; Kazuhide Fukushima; Toshiaki Tanaka; Tsuyoshi Takagi (IWSEC, 2010)

Towards Confidentiality of ID-Based Signcryption Schemes under without Random Oracle Model. - Mingwu Zhang; Pengcheng Li; Bo Yang 003; Hao Wang; Tsuyoshi Takagi (PAISI, 2010)

Fuzzy Biometric Signcryption Scheme with Bilinear Pairings in the Standard Model. - Mingwu Zhang; Bo Yang 003; Tsuyoshi Takagi; Yanping Shen; Wenzheng Zhang 001 (PAISI, 2010)

FPGA and ASIC implementations of the etaT pairing in characteristic three. - Jean-Luc Beuchat; Hiroshi Doi; Kaoru Fujita; Atsuo Inomata; Piseth Ith; Akira Kanaoka; Masayoshi Katouno; Masahiro Mambo; Eiji Okamoto; Takeshi Okamoto; Takaaki Shiga; Masaaki Shirase; et al. (Comput. Electr. Eng., 2010)

Cryptanalysis of efficient proxy signature schemes for mobile communication. - Fagen Li; Masaaki Shirase; Tsuyoshi Takagi (Sci. China Inf. Sci., 2010)

Solving a 676-bit Discrete Logarithm Problem in GF(36n). - Takuya Hayashi 001; Naoyuki Shinohara; Lihua Wang 001; Shin'ichiro Matsuo; Masaaki Shirase; Tsuyoshi Takagi (IACR Cryptol. ePrint Arch., 2010)

Efficient arithmetic on subfield elliptic curves over small finite fields of odd characteristic. - Keisuke Hakuta; Hisayoshi Sato; Tsuyoshi Takagi (J. Math. Cryptol., 2010)

GeoEnc: Geometric Area Based Keys and Policies in Functional Encryption Systems. - Mingwu Zhang; Tsuyoshi Takagi (ACISP, 2011)

An Experiment of Number Field Sieve over GF(p) of Low Hamming Weight Characteristic. - Kenichiro Hayasaka; Tsuyoshi Takagi (IWCC, 2011)

Dual-Verifiers DVS with Message Recovery for Tolerant Routing in Wireless Sensor Networks. - Mingwu Zhang; Tsuyoshi Takagi; Bo Yang 003 (PAISI, 2011)

Efficient Identity-Based Signcryption in the Standard Model. - Fagen Li; Fahad Bin Muhaya; Mingwu Zhang; Tsuyoshi Takagi (ProvSec, 2011)

Anonymous Encryption with Partial-Order Subset Delegation Functionality. - Mingwu Zhang; Takashi Nishide; Bo Yang 003; Tsuyoshi Takagi (ProvSec, 2011)

Efficient Implementation of the etaT Pairing on GPU. - Yosuke Katoh; Yun-Ju Huang; Chen-Mou Cheng; Tsuyoshi Takagi (IACR Cryptol. ePrint Arch., 2011)

Faster MapToPoint on Supersingular Elliptic Curves in Characteristic 3. - Yuto Kawahara; Tetsutaro Kobayashi; Gen Takahashi; Tsuyoshi Takagi (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2011)

An Improved Authenticated Encryption Scheme. - Fagen Li; Jiang Deng; Tsuyoshi Takagi (IEICE Trans. Inf. Syst., 2011)

Cryptanalysis and Fixed of Short Signature Scheme without Random Oracle from Bilinear Parings. - Mingwu Zhang; Bo Yang 003; Yusheng Zhong; Pengcheng Li; Tsuyoshi Takagi (Int. J. Netw. Secur., 2011)

Multibiometric Based Secure Encryption, Authentication Scheme with Fuzzy Extractor. - Mingwu Zhang; Bo Yang 003; Wenzheng Zhang 001; Tsuyoshi Takagi (Int. J. Netw. Secur., 2011)

Group-oriented setting's multisigncryption scheme with threshold designcryption. - Mingwu Zhang; Bo Yang 003; Tsuyoshi Takagi (Inf. Sci., 2011)

Zero-Knowledge Protocols for the McEliece Encryption. - Kirill Morozov; Tsuyoshi Takagi (ACISP, 2012)

Breaking Pairing-Based Cryptosystems Using η T Pairing over GF(397). - Takuya Hayashi 001; Takeshi Shimoyama; Naoyuki Shinohara; Tsuyoshi Takagi (ASIACRYPT, 2012)

Reducing the Key Size of Rainbow Using Non-commutative Rings. - Takanori Yasuda; Kouichi Sakurai; Tsuyoshi Takagi (CT-RSA, 2012)

Batch Verification Suitable for Efficiently Verifying a Limited Number of Signatures. - Keisuke Hakuta; Yosuke Katoh; Hisayoshi Sato; Tsuyoshi Takagi (ICISC, 2012)

Key Length Estimation of Pairing-Based Cryptosystems Using η T Pairing. - Naoyuki Shinohara; Takeshi Shimoyama; Takuya Hayashi 001; Tsuyoshi Takagi (ISPEC, 2012)

Application of Scalar Multiplication of Edwards Curves to Pairing-Based Cryptography. - Takanori Yasuda; Tsuyoshi Takagi; Kouichi Sakurai (IWSEC, 2012)

Efficient Secure Primitive for Privacy Preserving Distributed Computations. - Youwen Zhu; Tsuyoshi Takagi; Liusheng Huang (IWSEC, 2012)

Further improvement of an identity-based signcryption scheme in the standard model. - Fagen Li; Yongjian Liao; Zhiguang Qin; Tsuyoshi Takagi (Comput. Electr. Eng., 2012)

Efficient signcryption in the standard model. - Fagen Li; Mingwu Zhang; Tsuyoshi Takagi (Concurr. Comput. Pract. Exp., 2012)

Breaking pairing-based cryptosystems using ηT pairing over GF(397). - Takuya Hayashi 001; Takeshi Shimoyama; Naoyuki Shinohara; Tsuyoshi Takagi (IACR Cryptol. ePrint Arch., 2012)

Key Length Estimation of Pairing-based Cryptosystems using ηT Pairing. - Naoyuki Shinohara; Takeshi Shimoyama; Takuya Hayashi 001; Tsuyoshi Takagi (IACR Cryptol. ePrint Arch., 2012)

Solving a 676-Bit Discrete Logarithm Problem in GF(36n). - Takuya Hayashi 001; Naoyuki Shinohara; Lihua Wang 001; Shin'ichiro Matsuo; Masaaki Shirase; Tsuyoshi Takagi (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2012)

Analysis and Improvement of a Secret Broadcast with Binding Encryption in Broadcasting Networks. - Mingwu Zhang; Fagen Li; Tsuyoshi Takagi (IEICE Trans. Inf. Syst., 2012)

Cryptanalysis of Strong Designated Verifier Signature Scheme with Non-delegatability and Non-transferability. - Mingwu Zhang; Tsuyoshi Takagi; Bo Yang 003; Fagen Li (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2012)

Privacy-Preserving OLAP for Accurate Answer. - Youwen Zhu; Liusheng Huang; Tsuyoshi Takagi; Mingwu Zhang (J. Circuits Syst. Comput., 2012)

Identity-based online/offline signcryption for low power devices. - Fagen Li; Muhammad Khurram Khan; Khaled Alghathbar; Tsuyoshi Takagi (J. Netw. Comput. Appl., 2012)

An exhaustive search method to find all small solutions of a multivariate modular linear equation. - Hui Zhang 051; Tsuyoshi Takagi (JSIAM Lett., 2012)

Reconciling and improving of multi-receiver signcryption protocols with threshold decryption. - Mingwu Zhang; Bo Yang 003; Tsuyoshi Takagi (Secur. Commun. Networks, 2012)

Practical Identity-Based Signature for Wireless Sensor Networks. - Fagen Li; Di Zhong; Tsuyoshi Takagi (IEEE Wirel. Commun. Lett., 2012)

Attacks on Multi-Prime RSA with Small Prime Difference. - Hui Zhang 051; Tsuyoshi Takagi (ACISP, 2013)

On Zero-Knowledge Identification Based on Q-ary Syndrome Decoding. - Rong Hu; Kirill Morozov; Tsuyoshi Takagi (AsiaJCIS, 2013)

An Experiment of Number Field Sieve for Discrete Logarithm Problem over GF(p 12). - Kenichiro Hayasaka; Kazumaro Aoki; Tetsutaro Kobayashi; Tsuyoshi Takagi (Number Theory and Cryptography, 2013)

Proof of plaintext knowledge for code-based public-key encryption revisited. - Rong Hu; Kirill Morozov; Tsuyoshi Takagi (AsiaCCS, 2013)

A variant of rainbow with shorter secret key and faster signature generation. - Takanori Yasuda; Jintai Ding; Tsuyoshi Takagi; Kouichi Sakurai (AsiaPKC@AsiaCCS, 2013)

Secure k-NN computation on encrypted cloud data without sharing key with query users. - Youwen Zhu; Rui Xu 006; Tsuyoshi Takagi (SCC@ASIACCS, 2013)

Post-quantum Strongly Unforgeable Identity-Based Signature Scheme from Lattices without Random Oracles. - Zhenhua Liu 001; Xiangsong Zhang; Tsuyoshi Takagi (INCoS, 2013)

Improvement of Faugère et al.'s Method to Solve ECDLP. - Yun-Ju Huang; Christophe Petit 001; Naoyuki Shinohara; Tsuyoshi Takagi (IWSEC, 2013)

On Cheater Identifiable Secret Sharing Schemes Secure against Rushing Adversary. - Rui Xu 006; Kirill Morozov; Tsuyoshi Takagi (IWSEC, 2013)

Multivariate Signature Scheme Using Quadratic Forms. - Takanori Yasuda; Tsuyoshi Takagi; Kouichi Sakurai (PQCrypto, 2013)

Bounded Leakage-Resilient Functional Encryption with Hidden Vector Predicate. - Mingwu Zhang; Bo Yang 003; Tsuyoshi Takagi (Comput. J., 2013)

Lattice-based signcryption. - Fagen Li; Fahad Bin Muhaya; Muhammad Khurram Khan; Tsuyoshi Takagi (Concurr. Comput. Pract. Exp., 2013)

Parallel Gauss Sieve Algorithm: Solving the SVP in the Ideal Lattice of 128 dimensions. - Tsukasa Ishiguro; Shinsaku Kiyomoto; Yutaka Miyake; Tsuyoshi Takagi (IACR Cryptol. ePrint Arch., 2013)

General Fault Attacks on Multivariate Public Key Cryptosystems. - Yasufumi Hashimoto; Tsuyoshi Takagi; Kouichi Sakurai (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2013)

Secure k-NN query on encrypted cloud database without key-sharing. - Youwen Zhu; Rui Xu 006; Tsuyoshi Takagi (Int. J. Electron. Secur. Digit. Forensics, 2013)

Public Key Replacement and Universal Forgery of a SCLS Scheme. - Mingwu Zhang; Jintao Yao; Chunzhi Wang; Tsuyoshi Takagi (Int. J. Netw. Secur., 2013)

Certificateless hybrid signcryption. - Fagen Li; Masaaki Shirase; Tsuyoshi Takagi (Math. Comput. Model., 2013)

Secure identity-based signcryption in the standard model. - Fagen Li; Tsuyoshi Takagi (Math. Comput. Model., 2013)

Identity-based partially blind signature in the standard model for electronic cash. - Fagen Li; Mingwu Zhang; Tsuyoshi Takagi (Math. Comput. Model., 2013)

Efficient and adaptively secure broadcast encryption systems. - Mingwu Zhang; Bo Yang 003; Zhenhua Chen 001; Tsuyoshi Takagi (Secur. Commun. Networks, 2013)

Efficient Signcryption for Heterogeneous Systems. - Fagen Li; Hui Zhang 051; Tsuyoshi Takagi (IEEE Syst. J., 2013)

Efficient Constructions of Anonymous Multireceiver Encryption Protocol and Their Deployment in Group E-mail Systems With Privacy Preservation. - Mingwu Zhang; Tsuyoshi Takagi (IEEE Syst. J., 2013)

Cryptanalysis and Improvement of Robust Deniable Authentication Protocol. - Fagen Li; Tsuyoshi Takagi (Wirel. Pers. Commun., 2013)

Efficient Variant of Rainbow without Triangular Matrix Representation. - Takanori Yasuda; Tsuyoshi Takagi; Kouichi Sakurai (ICT-EurAsia, 2014)

Cheater Identifiable Secret Sharing Schemes via Multi-Receiver Authentication. - Rui Xu 006; Kirill Morozov; Tsuyoshi Takagi (IWSEC, 2014)

Parallel Gauss Sieve Algorithm: Solving the SVP Challenge over a 128-Dimensional Ideal Lattice. - Tsukasa Ishiguro; Shinsaku Kiyomoto; Yutaka Miyake; Tsuyoshi Takagi (Public Key Cryptography, 2014)

A Polynomial-Time Algorithm for Solving a Class of Underdetermined Multivariate Quadratic Equations over Fields of Odd Characteristics. - Chen-Mou Cheng; Yasufumi Hashimoto; Hiroyuki Miura; Tsuyoshi Takagi (PQCrypto, 2014)

Some properties of $τ$-adic expansions on hyperelliptic Koblitz curves. - Keisuke Hakuta; Hisayoshi Sato; Tsuyoshi Takagi (CoRR, 2014)

Efficient Algorithm for Tate Pairing of Composite Order. - Yutaro Kiyomura; Tsuyoshi Takagi (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2014)

Extended Algorithm for Solving Underdefined Multivariate Quadratic Equations. - Hiroyuki Miura; Yasufumi Hashimoto; Tsuyoshi Takagi (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2014)

Key Length Estimation of Pairing-Based Cryptosystems Using ηT Pairing over GF(3n). - Naoyuki Shinohara; Takeshi Shimoyama; Takuya Hayashi 001; Tsuyoshi Takagi (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2014)

Security of Multivariate Signature Scheme Using Non-commutative Rings. - Takanori Yasuda; Tsuyoshi Takagi; Kouichi Sakurai (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2014)

Improved Attacks on Multi-Prime RSA with Small Prime Difference. - Hui Zhang 051; Tsuyoshi Takagi (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2014)

Efficient Privacy-Preserving Reputation Evaluation in Decentralized Environments. - Youwen Zhu; Tsuyoshi Takagi (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2014)

Security Analysis of Collusion-Resistant Nearest Neighbor Query Scheme on Encrypted Cloud Data. - Youwen Zhu; Tsuyoshi Takagi; Rong Hu (IEICE Trans. Inf. Syst., 2014)

Anonymous encryption with partial-order subset delegation and its application in privacy email systems. - Mingwu Zhang; Takashi Nishide; Bo Yang 003; Tsuyoshi Takagi (IET Inf. Secur., 2014)

Fully secure constructions of spatial encryption with vector privacy. - Mingwu Zhang; Chunzhi Wang; Bo Yang 003; Tsuyoshi Takagi (Int. J. Commun. Syst., 2014)

Anonymous spatial encryption under affine space delegation functionality with full security. - Mingwu Zhang; Bo Yang 003; Tsuyoshi Takagi (Inf. Sci., 2014)

Efficient variant of Rainbow using sparse secret keys. - Takanori Yasuda; Tsuyoshi Takagi; Kouichi Sakurai (J. Wirel. Mob. Networks Ubiquitous Comput. Dependable Appl., 2014)

An experiment of number field sieve for discrete logarithm problem over $ text{GF}(p^n)$. - Kenichiro Hayasaka; Kazumaro Aoki; Tetsutaro Kobayashi; Tsuyoshi Takagi (JSIAM Lett., 2014)

Heuristic counting of Kachisa-Schaefer-Scott curves. - Yutaro Kiyomura; Noriyasu Iwamoto; Shun'ichi Yokoyama; Kenichiro Hayasaka; Yuntao Wang 002; Takanori Yasuda; Katsuyuki Takashima; Tsuyoshi Takagi (JSIAM Lett., 2014)

Efficient system parameters for Identity-Based Encryption using supersingular elliptic curves. - Takumi Tomita; Tsuyoshi Takagi (JSIAM Lett., 2014)

Collaborative agglomerative document clustering with limited information disclosure. - Chunhua Su; Jianying Zhou 001; Feng Bao 001; Tsuyoshi Takagi; Kouichi Sakurai (Secur. Commun. Networks, 2014)

Unbounded anonymous hierarchical IBE with continual-key-leakage tolerance. - Mingwu Zhang; Bo Yang 003; Chunzhi Wang; Tsuyoshi Takagi (Secur. Commun. Networks, 2014)

Constructing Pairing-Friendly Elliptic Curves Using Global Number Fields. - Takanori Yasuda; Tsuyoshi Takagi; Kouichi Sakurai (CANDAR, 2015)

A multivariate quadratic challenge toward post-quantum generation cryptography. - Takanori Yasuda; Xavier Dahan; Yun-Ju Huang; Tsuyoshi Takagi; Kouichi Sakurai (ACM Commun. Comput. Algebra, 2015)

Functional Encryption Resilient to Hard-to-Invert Leakage. - Mingwu Zhang; Chunzhi Wang; Tsuyoshi Takagi; Yi Mu 001 (Comput. J., 2015)

Cryptanalysis of a public key cryptosystem based on Diophantine equations via weighted LLL reduction. - Jintai Ding; Momonari Kudo; Shinya Okumura; Tsuyoshi Takagi; Chengdong Tao (IACR Cryptol. ePrint Arch., 2015)

A construction of 3-dimensional lattice sieve for number field sieve over F_{p^n}. - Kenichiro Hayasaka; Kazumaro Aoki; Tetsutaro Kobayashi; Tsuyoshi Takagi (IACR Cryptol. ePrint Arch., 2015)

On Generalized First Fall Degree Assumptions. - Yun-Ju Huang; Christophe Petit 001; Naoyuki Shinohara; Tsuyoshi Takagi (IACR Cryptol. ePrint Arch., 2015)

Security Analysis of Cryptosystems Using Short Generators over Ideal Lattices. - Shinya Okumura; Shingo Sugiyama; Masaya Yasuda; Tsuyoshi Takagi (IACR Cryptol. ePrint Arch., 2015)

MQ Challenge: Hardness Evaluation of Solving Multivariate Quadratic Problems. - Takanori Yasuda; Xavier Dahan; Yun-Ju Huang; Tsuyoshi Takagi; Kouichi Sakurai (IACR Cryptol. ePrint Arch., 2015)

Zero-Knowledge Protocols for Code-Based Public-Key Encryption. - Rong Hu; Kirill Morozov; Tsuyoshi Takagi (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2015)

Note on Some Recent Cheater Identifiable Secret Sharing Schemes. - Rui Xu 006; Kirill Morozov; Tsuyoshi Takagi (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2015)

Efficient scalar product protocol and its privacy-preserving application. - Youwen Zhu; Tsuyoshi Takagi (Int. J. Electron. Secur. Digit. Forensics, 2015)

Revocable Identity-based Signcryption Scheme Without Random Oracles. - Xiangsong Zhang; Zhenhua Liu 001; Yupu Hu; Tsuyoshi Takagi (Int. J. Netw. Secur., 2015)

On the Security of A Privacy-Preserving Product Calculation Scheme. - Youwen Zhu; Zhiqiu Huang; Liusheng Huang; Tsuyoshi Takagi (IEEE Trans. Dependable Secur. Comput., 2015)

Reducing the Key Size of the SRP Encryption Scheme. - Dung Hoang Duong; Albrecht Petzoldt; Tsuyoshi Takagi (ACISP (2), 2016)

Privacy-Preserving k-Nearest Neighbour Query on Outsourced Database. - Rui Xu 006; Kirill Morozov; Yanjiang Yang; Jianying Zhou 001; Tsuyoshi Takagi (ACISP (1), 2016)

Image Sensor with Organic Photoconductive Films by Stacking Red/Green and Blue Components. - Tsuyoshi Takagi; Hwajung Seo; Toshikatsu Sakai; Hiroshi Ohtake; Mamoru Furuta (IMSE, 2016)

An Estimate of the Complexity of the Section Finding Problem on Algebraic Surfaces. - Shinya Okumura; Koichiro Akiyama; Tsuyoshi Takagi (CANDAR, 2016)

On tameness of Matsumoto-Imai central maps in three variables over the finite field 픽2. - Keisuke Hakuta; Hisayoshi Sato; Tsuyoshi Takagi (Adv. Math. Commun., 2016)

Improved Progressive BKZ Algorithms and their Precise Cost Estimation by Sharp Simulator. - Yoshinori Aono; Yuntao Wang 002; Takuya Hayashi 001; Tsuyoshi Takagi (IACR Cryptol. ePrint Arch., 2016)

Reducing the Key Size of the SRP Encryption Scheme - Extended version. - Dung Hoang Duong; Albrecht Petzoldt; Tsuyoshi Takagi (IACR Cryptol. ePrint Arch., 2016)

Revisiting the Cubic UOV Signature Scheme. - Dung Hoang Duong; Albrecht Petzoldt; Yacheng Wang; Tsuyoshi Takagi (IACR Cryptol. ePrint Arch., 2016)

Revisiting the Efficient Key Generation of ZHFE. - Yasuhiko Ikematsu; Dung Hoang Duong; Albrecht Petzoldt; Tsuyoshi Takagi (IACR Cryptol. ePrint Arch., 2016)

Portable Implementation of Lattice-based Cryptography using JavaScript. - Ye Yuan 005; Chen-Mou Cheng; Shinsaku Kiyomoto; Yutaka Miyake; Tsuyoshi Takagi (Int. J. Netw. Comput., 2016)

Secure and controllable k-NN query over encrypted cloud data with key confidentiality. - Youwen Zhu; Zhiqiu Huang; Tsuyoshi Takagi (J. Parallel Distributed Comput., 2016)

Special issue on provable security. - Shaoquan Jiang; Tsuyoshi Takagi; Guilin Wang (Secur. Commun. Networks, 2016)

Revocable and strongly unforgeable identity-based signature scheme in the standard model. - Zhenhua Liu 001; Xiangsong Zhang; Yupu Hu; Tsuyoshi Takagi (Secur. Commun. Networks, 2016)

Security Analysis and Improvements on Two Homomorphic Authentication Schemes for Network Coding. - Chi Cheng; Jemin Lee; Tao Jiang 002; Tsuyoshi Takagi (IEEE Trans. Inf. Forensics Secur., 2016)

Efficient Deniably Authenticated Encryption and Its Application to E-Mail. - Fagen Li; Di Zhong; Tsuyoshi Takagi (IEEE Trans. Inf. Forensics Secur., 2016)

Introduction to CREST Crypto-Math Project. - Tsuyoshi Takagi (CREST Crypto-Math Project, 2017)

Secure and Efficient Pairing at 256-Bit Security Level. - Yutaro Kiyomura; Akiko Inoue; Yuto Kawahara; Masaya Yasuda; Tsuyoshi Takagi; Tetsutaro Kobayashi (ACNS, 2017)

An Experimental Study of the BDD Approach for the Search LWE Problem. - Rui Xu 006; Sze Ling Yeo; Kazuhide Fukushima; Tsuyoshi Takagi; Hwajung Seo; Shinsaku Kiyomoto; Matt Henricksen (ACNS, 2017)

Memory-constrained implementation of lattice-based encryption scheme on standard Java Card. - Ye Yuan 005; Kazuhide Fukushima; Shinsaku Kiyomoto; Tsuyoshi Takagi (HOST, 2017)

An Experimental Study of Kannan's Embedding Technique for the Search LWE Problem. - Yuntao Wang 002; Yoshinori Aono; Tsuyoshi Takagi (ICICS, 2017)

The Beauty and the Beasts - The Hard Cases in LLL Reduction. - Saed Alsayigh; Jintai Ding; Tsuyoshi Takagi; Yuntao Wang 002 (IWSEC, 2017)

A Public-Key Encryption Scheme Based on Non-linear Indeterminate Equations. - Koichiro Akiyama; Yasuhiro Goto; Shinya Okumura; Tsuyoshi Takagi; Koji Nuida; Goichiro Hanaoka (SAC, 2017)

Securing the Internet of Things in a Quantum World. - Chi Cheng; Rongxing Lu; Albrecht Petzoldt; Tsuyoshi Takagi (IEEE Commun. Mag., 2017)

Efficient outsourcing of secure k-nearest neighbour query over encrypted database. - Rui Xu 006; Kirill Morozov; Yanjiang Yang; Jianying Zhou 001; Tsuyoshi Takagi (Comput. Secur., 2017)

A Public-key Encryption Scheme Based on Non-linear Indeterminate Equations (Giophantus). - Koichiro Akiyama; Yasuhiro Goto; Shinya Okumura; Tsuyoshi Takagi; Koji Nuida; Goichiro Hanaoka; Hideo Shimizu; Yasuhiko Ikematsu (IACR Cryptol. ePrint Arch., 2017)

Choosing Parameters for the Subfield Lattice Attack against overstretched NTRU. - Dung Hoang Duong; Masaya Yasuda; Tsuyoshi Takagi (IACR Cryptol. ePrint Arch., 2017)

CyclicSRP - A Multivariate Encryption Scheme with a Partially Cyclic Public Key. - Dung Hoang Duong; Albrecht Petzoldt; Tsuyoshi Takagi (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2017)

Full Cryptanalysis of Hash Functions Based on Cubic Ramanujan Graphs. - Hyungrok Jo; Christophe Petit 001; Tsuyoshi Takagi (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2017)

Secret Sharing with Cheaters Using Multi-Receiver Authentication. - Rui Xu 006; Kirill Morozov; Tsuyoshi Takagi (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2017)

Constructing an efficient hash function from $3$-isogenies. - Hikari Tachibana; Katsuyuki Takashima; Tsuyoshi Takagi (JSIAM Lett., 2017)

Efficient Decryption Algorithms for Extension Field Cancellation Type Encryption Schemes. - Yacheng Wang; Yasuhiko Ikematsu; Dung Hoang Duong; Tsuyoshi Takagi (ACISP, 2018)

Improving the BKZ Reduction Algorithm by Quick Reordering Technique. - Yuntao Wang 002; Tsuyoshi Takagi (ACISP, 2018)

An Improvement on the Linear Algebraic Attack for the Indeterminate Equation Encryption Scheme. - Yasuhiko Ikematsu; Koichiro Akiyama; Tsuyoshi Takagi (ISITA, 2018)

Estimated Cost for Solving Generalized Learning with Errors Problem via Embedding Techniques. - Weiyao Wang 004; Yuntao Wang 002; Atsushi Takayasu; Tsuyoshi Takagi (IWSEC, 2018)

HFERP - A New Multivariate Encryption Scheme. - Yasuhiko Ikematsu; Ray A. Perlner; Daniel Smith-Tone; Tsuyoshi Takagi; Jeremy Vates (PQCrypto, 2018)

Why 1.02? The root Hermite factor of LLL and stochastic sandpile models. - Jintai Ding; Seungki Kim; Tsuyoshi Takagi; Yuntao Wang 002 (CoRR, 2018)

Tight Reductions for Diffie-Hellman Variants in the Algebraic Group Model. - Taiga Mizuide; Atsushi Takayasu; Tsuyoshi Takagi (IACR Cryptol. ePrint Arch., 2018)

An Efficient Key Generation of ZHFE Public Key Cryptosystem. - Yasuhiko Ikematsu; Dung Hoang Duong; Albrecht Petzoldt; Tsuyoshi Takagi (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2018)

Recent Developments in Post-Quantum Cryptography. - Tsuyoshi Takagi (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2018)

Hardness Evaluation for Search LWE Problem Using Progressive BKZ Simulator. - Yuntao Wang 002; Yoshinori Aono; Tsuyoshi Takagi (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2018)

Portable Implementation of Postquantum Encryption Schemes and Key Exchange Protocols on JavaScript-Enabled Platforms. - Ye Yuan 005; Junting Xiao; Kazuhide Fukushima; Shinsaku Kiyomoto; Tsuyoshi Takagi (Secur. Commun. Networks, 2018)

One Sample Ring-LWE with Rounding and Its Application to Key Exchange. - Jintai Ding; Xinwei Gao; Tsuyoshi Takagi; Yuntao Wang 002 (ACNS, 2019)

Group Key Exchange from CSIDH and Its Application to Trusted Setup in Supersingular Isogeny Cryptosystems. - Tomoki Moriya; Katsuyuki Takashima; Tsuyoshi Takagi (Inscrypt, 2019)

An Efficient MQ-Based Signature in the QROM. - Hiroki Furue; Dung Hoang Duong; Tsuyoshi Takagi (CANDAR, 2019)

Security Analysis and Efficient Implementation of Code-based Signature Schemes. - Partha Sarathi Roy 001; Kirill Morozov; Kazuhide Fukushima; Shinsaku Kiyomoto; Tsuyoshi Takagi (ICISSP, 2019)

(Short Paper) A Faster Constant-Time Algorithm of CSIDH Keeping Two Points. - Hiroshi Onuki; Yusuke Aikawa; Tsutomu Yamazaki; Tsuyoshi Takagi (IWSEC, 2019)

LLL and stochastic sandpile models. - Jintai Ding; Seungki Kim; Tsuyoshi Takagi; Yuntao Wang 002 (IACR Cryptol. ePrint Arch., 2019)

A Faster Constant-time Algorithm of CSIDH keeping Two Torsion Points. - Hiroshi Onuki; Yusuke Aikawa; Tsutomu Yamazaki; Tsuyoshi Takagi (IACR Cryptol. ePrint Arch., 2019)

On collisions related to an ideal class of order 3 in CSIDH. - Hiroshi Onuki; Tsuyoshi Takagi (IACR Cryptol. ePrint Arch., 2019)

Explicit Relation between Low-Dimensional LLL-Reduced Bases and Shortest Vectors. - Kotaro Matsuda; Atsushi Takayasu; Tsuyoshi Takagi (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2019)

The Secure Parameters and Efficient Decryption Algorithm for Multivariate Public Key Cryptosystem EFC. - Yacheng Wang; Yasuhiko Ikematsu; Dung Hoang Duong; Tsuyoshi Takagi (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2019)

Chosen Message Attack on Multivariate Signature ELSA at Asiacrypt 2017. - Yasufumi Hashimoto; Yasuhiko Ikematsu; Tsuyoshi Takagi (J. Inf. Process., 2019)

Batten Down the Hatches: Securing Neighborhood Area Networks of Smart Grid in the Quantum Era. - Chi Cheng; Yue Qin; Rongxing Lu; Tao Jiang 002; Tsuyoshi Takagi (IEEE Trans. Smart Grid, 2019)

Cryptanalysis of GiophantusTM Schemes against Hybrid Attack. - Yuntao Wang 002; Yasuhiko Ikematsu; Koichiro Akiyama; Tsuyoshi Takagi (APKC@AsiaCCS, 2020)

A Structural Attack on Block-Anti-Circulant UOV at SAC 2019. - Hiroki Furue; Koha Kinjo; Yasuhiko Ikematsu; Yacheng Wang; Tsuyoshi Takagi (PQCrypto, 2020)

Multivariate Encryption Schemes Based on Polynomial Equations over Real Numbers. - Takanori Yasuda; Yacheng Wang; Tsuyoshi Takagi (PQCrypto, 2020)

Short Lattice Signatures in the Standard Model with Efficient Tag Generation. - Kaisei Kajita; Kazuto Ogawa; Koji Nuida; Tsuyoshi Takagi (ProvSec, 2020)

Revisiting the Minrank Problem on Multivariate Cryptography. - Yacheng Wang; Yasuhiko Ikematsu; Shuhei Nakamura; Tsuyoshi Takagi (WISA, 2020)

A New Variant of Unbalanced Oil and Vinegar Using Quotient Ring: QR-UOV. - Hiroki Furue; Yasuhiko Ikematsu; Yutaro Kiyomura; Tsuyoshi Takagi (IACR Cryptol. ePrint Arch., 2020)

An Efficient Authenticated Key Exchange from Random Self-Reducibility on CSIDH. - Tomoki Kawashima; Katsuyuki Takashima; Yusuke Aikawa; Tsuyoshi Takagi (IACR Cryptol. ePrint Arch., 2020)

SiGamal: A supersingular isogeny-based PKE and its application to a PRF. - Tomoki Moriya; Hiroshi Onuki; Tsuyoshi Takagi (IACR Cryptol. ePrint Arch., 2020)

L1-Norm Ball for CSIDH: Optimal Strategy for Choosing the Secret Key Space. - Kohei Nakagawa; Hiroshi Onuki; Atsushi Takayasu; Tsuyoshi Takagi (IACR Cryptol. ePrint Arch., 2020)

Improving Key Mismatch Attack on NewHope with Fewer Queries. - Satoshi Okada; Yuntao Wang 002; Tsuyoshi Takagi (IACR Cryptol. ePrint Arch., 2020)

The Existence of Cycles in the Supersingular Isogeny Graphs Used in SIKE. - Hiroshi Onuki; Yusuke Aikawa; Tsuyoshi Takagi (IACR Cryptol. ePrint Arch., 2020)

On the Complexity of the LWR-Solving BKW Algorithm. - Hiroki Okada 001; Atsushi Takayasu; Kazuhide Fukushima; Shinsaku Kiyomoto; Tsuyoshi Takagi (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2020)

A Constant-Time Algorithm of CSIDH Keeping Two Points. - Hiroshi Onuki; Yusuke Aikawa; Tsutomu Yamazaki; Tsuyoshi Takagi (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2020)

An Efficient MQ-based Signature with Tight Security Proof. - Hiroki Furue; Dung Hoang Duong; Tsuyoshi Takagi (Int. J. Netw. Comput., 2020)

Shortest Vectors in Lattices of Bai-Galbraith's Embedding Attack on the LWR Problem. - Shusaku Uemura; Kazuhide Fukushima; Shinsaku Kiyomoto; Momonari Kudo; Tsuyoshi Takagi (IWSEC, 2021)

(Short Paper) Simple Matrix Signature Scheme. - Changze Yin; Yacheng Wang; Tsuyoshi Takagi (IWSEC, 2021)

Improving Thomae-Wolf Algorithm for Solving Underdetermined Multivariate Quadratic Polynomial Problem. - Hiroki Furue; Shuhei Nakamura; Tsuyoshi Takagi (PQCrypto, 2021)

A Compact Digital Signature Scheme Based on the Module-LWR Problem. - Hiroki Okada 001; Atsushi Takayasu; Kazuhide Fukushima; Shinsaku Kiyomoto; Tsuyoshi Takagi (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2021)

Memory-constrained implementation of lattice-based encryption scheme on standard Java Card platform. - Ye Yuan 005; Kazuhide Fukushima; Junting Xiao; Shinsaku Kiyomoto; Tsuyoshi Takagi (IET Inf. Secur., 2021)

Studying lattice reduction algorithms improved by quick reordering technique. - Yuntao Wang 002; Tsuyoshi Takagi (Int. J. Inf. Sec., 2021)

New complexity estimation on the Rainbow-Band-Separation attack. - Shuhei Nakamura; Yasuhiko Ikematsu; Yacheng Wang; Jintai Ding; Tsuyoshi Takagi (Theor. Comput. Sci., 2021)

Efficient Word Size Modular Multiplication over Signed Integers. - Daichi Aoki; Kazuhiko Minematsu; Toshihiko Okamura; Tsuyoshi Takagi (ARITH, 2022)

Improving Fault Attacks on Rainbow with Fixing Random Vinegar Values. - Taku Kato; Yutaro Kiyomura; Tsuyoshi Takagi (IWSEC, 2022)

A New Fault Attack on UOV Multivariate Signature Scheme. - Hiroki Furue; Yutaro Kiyomura; Tatsuya Nagasawa; Tsuyoshi Takagi (PQCrypto, 2022)

The Generalized Montgomery Coordinate: A New Computational Tool for Isogeny-based Cryptography. - Tomoki Moriya; Hiroshi Onuki; Yusuke Aikawa; Tsuyoshi Takagi (IACR Cryptol. ePrint Arch., 2022)

Erratum: A Compact Digital Signature Scheme Based on the Module-LWR Problem [IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences Vol. E104.A (2021), No. 9 pp.1219-1234]. - Hiroki Okada 001; Atsushi Takayasu; Kazuhide Fukushima; Shinsaku Kiyomoto; Tsuyoshi Takagi (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2022)

Revisiting the Orthogonal Lattice Algorithm in Solving General Approximate Common Divisor Problem. - Xiaoling Yu; Yuntao Wang 002; Chungen Xu; Tsuyoshi Takagi (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2022)

Explicit construction of the square-root Vélu's formula on Edwards curves. - Shu Takahashi; Hiroshi Onuki; Tsuyoshi Takagi (JSIAM Lett., 2022)

Memory-Efficient Quantum Information Set Decoding Algorithm. - Naoto Kimura; Atsushi Takayasu; Tsuyoshi Takagi (ACISP, 2023)

Robust Property-Preserving Hash Meets Homomorphism. - Keyang Liu; Xingxin Li; Tsuyoshi Takagi (ISC, 2023)

Improved Hybrid Attack via Error-Splitting Method for Finding Quinary Short Lattice Vectors. - Haiming Zhu; Shoichi Kamada; Momonari Kudo; Tsuyoshi Takagi (IWSEC, 2023)

Fast Enumeration Algorithm for Multivariate Polynomials over General Finite Fields. - Hiroki Furue; Tsuyoshi Takagi (IACR Cryptol. ePrint Arch., 2023)

Lower bound of costs of formulas to compute image curves of 3-isogenies in the framework of generalized Montgomery coordinates. - Tomoki Moriya; Hiroshi Onuki; Yusuke Aikawa; Tsuyoshi Takagi (IACR Cryptol. ePrint Arch., 2023)

Spherical Gaussian Leftover Hash Lemma via the Rényi Divergence. - Hiroki Okada 001; Kazuhide Fukushima; Shinsaku Kiyomoto; Tsuyoshi Takagi (IACR Cryptol. ePrint Arch., 2023)

An Efficient Algorithm for Solving the MQ Problem using Hilbert Series. - Kosuke Sakata; Tsuyoshi Takagi (IACR Cryptol. ePrint Arch., 2023)

Improvement of the square-root Vélu's formulas for isogeny-based cryptography. - Saki Otsuki; Hiroshi Onuki; Tsuyoshi Takagi (JSIAM Lett., 2023)

L1-norm ball for CSIDH: Optimal strategy for choosing the secret key space. - Kohei Nakagawa; Hiroshi Onuki; Atsushi Takayasu; Tsuyoshi Takagi (Discret. Appl. Math., 2023)

Short Lattice Signature Scheme with Tighter Reduction under Ring-SIS Assumption. - Kaisei Kajita; Go Ohtake; Kazuto Ogawa; Koji Nuida; Tsuyoshi Takagi (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2023)

Recent progress in the security evaluation of multivariate public-key cryptography. - Yasuhiko Ikematsu; Shuhei Nakamura; Tsuyoshi Takagi (IET Inf. Secur., 2023)

How to construct CSIDH on Edwards curves. - Tomoki Moriya; Hiroshi Onuki; Tsuyoshi Takagi (Finite Fields Their Appl., 2023)

Efficient Search for Superspecial Hyperelliptic Curves of Genus Four with Automorphism Group Containing bfC6. - Momonari Kudo; Tasuku Nakagawa; Tsuyoshi Takagi (Math. Comput. Sci., 2023)

Correction to: Efficient Search for Superspecial Hyperelliptic Curves of Genus Four with Automorphism Group Containing bfC6. - Momonari Kudo; Tasuku Nakagawa; Tsuyoshi Takagi (Math. Comput. Sci., 2023)

A Transparent Zero-Knowledge Dual Membership Set Commitment based on Perfect Hash Function. - Keyang Liu; Tsuyoshi Takagi (CANDAR, 2024)

Review the Cuckoo Hash-Based Unbalanced Private Set Union: Leakage, Fix, and Optimization. - Keyang Liu; Xingxin Li; Tsuyoshi Takagi (ESORICS (2), 2024)

A Faster Variant of CGL Hash Function via Efficient Backtracking Checks. - Shota Inoue; Yusuke Aikawa; Tsuyoshi Takagi (ISC (2), 2024)

Sieving Method for SDP with the Zero Window: An Improvement in Low Memory Environments. - Naoki Yoshiguchi; Yusuke Aikawa; Tsuyoshi Takagi (IWSEC, 2024)

Consecutive Adaptor Signature Scheme: From Two-Party to N-Party Settings. - Kaisei Kajita; Go Ohtake; Tsuyoshi Takagi (ProvSec (1), 2024)

Tightly Secure Identity-Based Signature from Cryptographic Group Actions. - Thanh Xuan Khuc; Willy Susilo; Dung Hoang Duong; Fuchun Guo; Hyungrok Jo; Tsuyoshi Takagi (ProvSec (1), 2024)

Generalized Adaptor Signature Scheme: From Two-Party to N-Party Settings. - Kaisei Kajita; Go Ohtake; Tsuyoshi Takagi (IACR Cryptol. ePrint Arch., 2024)

Simulation-Secure Threshold PKE from Standard (Ring-)LWE. - Hiroki Okada 001; Tsuyoshi Takagi (IACR Cryptol. ePrint Arch., 2024)

Revisiting the Security of Fiat-Shamir Signature Schemes under Superposition Attacks. - Quan Yuan; Chao Sun; Tsuyoshi Takagi (IACR Cryptol. ePrint Arch., 2024)

On the weak key of post-quantum key agreement SAA-5. - Genki Akimoto; Tsuyoshi Takagi (JSIAM Lett., 2024)

Explicit addition formulae on hyperelliptic curves of genus 2 for isogeny-based cryptography. - Kaito Sato; Hiroshi Onuki; Tsuyoshi Takagi (JSIAM Lett., 2024)

Gram Root Decomposition over the Polynomial Ring: Application to Sphericalization of Discrete Gaussian. - Hiroki Okada 001; Tsuyoshi Takagi (ICISSP (2), 2025)

Low Communication Threshold FHE from Standard (Module-)LWE. - Hiroki Okada 001; Tsuyoshi Takagi (IACR Cryptol. ePrint Arch., 2025)

Exfiltration-Resistant Proxy Re-Encryption for IoT Data Sharing in Unreliable Clouds. - Yuyang Zhou; Liang Zhao 020; Fagen Li; Tsuyoshi Takagi (IEEE Trans. Dependable Secur. Comput., 2025)

An Algorithm for Computing the Leading Monomials of a Minimal Groebner Basis of Generic Sequences. - Kosuke Sakata; Tsuyoshi Takagi (CoRR, 2025)

Revisiting Cuckoo Hash-based Unbalanced Private Set Union: Leakage Analysis and Better Construction. - Keyang Liu; Xingxin Li; Tsuyoshi Takagi (Int. J. Inf. Sec., 2025)