Tsuyoshi Takagi

Mingwu Zhang, Bo Yang, Tsuyoshi Takagi: Bounded Leakage-Resilient Functional Encryption with Hidden Vector Predicate. Comput. J. 56(4): 464-477 (2013)

Yasufumi Hashimoto, Tsuyoshi Takagi, Kouichi Sakurai: General Fault Attacks on Multivariate Public Key Cryptosystems. IEICE Transactions 96-A(1): 196-205 (2013)

Fagen Li, Masaaki Shirase, Tsuyoshi Takagi: Certificateless hybrid signcryption. Mathematical and Computer Modelling 57(3-4): 324-343 (2013)

Fagen Li, Tsuyoshi Takagi: Cryptanalysis and Improvement of Robust Deniable Authentication Protocol. Wireless Personal Communications 69(4): 1391-1398 (2013)

Fagen Li, Yongjian Liao, Zhiguang Qin, Tsuyoshi Takagi: Further improvement of an identity-based signcryption scheme in the standard model. Computers & Electrical Engineering 38(2): 413-421 (2012)

Fagen Li, Mingwu Zhang, Tsuyoshi Takagi: Efficient signcryption in the standard model. Concurrency and Computation: Practice and Experience 24(17): 1977-1989 (2012)

Takuya Hayashi, Naoyuki Shinohara, Lihua Wang, Shin'ichiro Matsuo, Masaaki Shirase, Tsuyoshi Takagi: Solving a 676-Bit Discrete Logarithm Problem in GF(3⁶ⁿ). IEICE Transactions 95-A(1): 204-212 (2012)

Mingwu Zhang, Tsuyoshi Takagi, Bo Yang, Fagen Li: Cryptanalysis of Strong Designated Verifier Signature Scheme with Non-delegatability and Non-transferability. IEICE Transactions 95-A(1): 259-262 (2012)

Mingwu Zhang, Fagen Li, Tsuyoshi Takagi: Analysis and Improvement of a Secret Broadcast with Binding Encryption in Broadcasting Networks. IEICE Transactions 95-D(2): 686-689 (2012)

Youwen Zhu, Liusheng Huang, Tsuyoshi Takagi, Mingwu Zhang: Privacy-Preserving OLAP for Accurate Answer. Journal of Circuits, Systems, and Computers 21(1) (2012)

Fagen Li, Muhammad Khurram Khan, Khaled Alghathbar, Tsuyoshi Takagi: Identity-based online/offline signcryption for low power devices. J. Network and Computer Applications 35(1): 340-347 (2012)

Mingwu Zhang, Bo Yang, Tsuyoshi Takagi: Reconciling and improving of multi-receiver signcryption protocols with threshold decryption. Security and Communication Networks 5(12): 1430-1440 (2012)

Kirill Morozov, Tsuyoshi Takagi: Zero-Knowledge Protocols for the McEliece Encryption. ACISP 2012: 180-193

Takuya Hayashi, Takeshi Shimoyama, Naoyuki Shinohara, Tsuyoshi Takagi: Breaking Pairing-Based Cryptosystems Using η T Pairing over GF(397). ASIACRYPT 2012: 43-60

Takanori Yasuda, Kouichi Sakurai, Tsuyoshi Takagi: Reducing the Key Size of Rainbow Using Non-commutative Rings. CT-RSA 2012: 68-83

Keisuke Hakuta, Yosuke Katoh, Hisayoshi Sato, Tsuyoshi Takagi: Batch Verification Suitable for Efficiently Verifying a Limited Number of Signatures. ICISC 2012: 425-440

Naoyuki Shinohara, Takeshi Shimoyama, Takuya Hayashi, Tsuyoshi Takagi: Key Length Estimation of Pairing-Based Cryptosystems Using η T Pairing. ISPEC 2012: 228-244

Takanori Yasuda, Tsuyoshi Takagi, Kouichi Sakurai: Application of Scalar Multiplication of Edwards Curves to Pairing-Based Cryptography. IWSEC 2012: 19-36

Youwen Zhu, Tsuyoshi Takagi, Liusheng Huang: Efficient Secure Primitive for Privacy Preserving Distributed Computations. IWSEC 2012: 233-243

Tsuyoshi Takagi, Guilin Wang, Zhiguang Qin, Shaoquan Jiang, Yong Yu (Eds.): Provable Security - 6th International Conference, ProvSec 2012, Chengdu, China, September 26-28, 2012. Proceedings. Lecture Notes in Computer Science 7496, Springer 2012, isbn 978-3-642-33271-5

Naoyuki Shinohara, Takeshi Shimoyama, Takuya Hayashi, Tsuyoshi Takagi: Key Length Estimation of Pairing-based Cryptosystems using $\eta_T$ Pairing. IACR Cryptology ePrint Archive 2012: 42 (2012)

Takuya Hayashi, Takeshi Shimoyama, Naoyuki Shinohara, Tsuyoshi Takagi: Breaking pairing-based cryptosystems using $\eta_T$ pairing over $GF(3^{97})$. IACR Cryptology ePrint Archive 2012: 345 (2012)

Yuto Kawahara, Tetsutaro Kobayashi, Gen Takahashi, Tsuyoshi Takagi: Faster MapToPoint on Supersingular Elliptic Curves in Characteristic 3. IEICE Transactions 94-A(1): 150-155 (2011)

Fagen Li, Jiang Deng, Tsuyoshi Takagi: An Improved Authenticated Encryption Scheme. IEICE Transactions 94-D(11): 2171-2172 (2011)

Mingwu Zhang, Bo Yang, Wenzheng Zhang, Tsuyoshi Takagi: Multibiometric Based Secure Encryption, Authentication Scheme with Fuzzy Extractor. I. J. Network Security 12(1): 50-57 (2011)

Mingwu Zhang, Bo Yang, Yusheng Zhong, Pengcheng Li, Tsuyoshi Takagi: Cryptanalysis and Fixed of Short Signature Scheme without Random Oracle from Bilinear Parings. I. J. Network Security 12(3): 130-136 (2011)

Mingwu Zhang, Bo Yang, Tsuyoshi Takagi: Group-oriented setting's multisigncryption scheme with threshold designcryption. Inf. Sci. 181(18): 4041-4050 (2011)

Mingwu Zhang, Tsuyoshi Takagi: GeoEnc: Geometric Area Based Keys and Policies in Functional Encryption Systems. ACISP 2011: 241-258

Kenichiro Hayasaka, Tsuyoshi Takagi: An Experiment of Number Field Sieve over GF(p) of Low Hamming Weight Characteristic. IWCC 2011: 191-200

Mingwu Zhang, Tsuyoshi Takagi, Bo Yang: Dual-Verifiers DVS with Message Recovery for Tolerant Routing in Wireless Sensor Networks. PAISI 2011: 71-84

Yasufumi Hashimoto, Tsuyoshi Takagi, Kouichi Sakurai: General Fault Attacks on Multivariate Public Key Cryptosystems. PQCrypto 2011: 1-18

Fagen Li, Fahad Bin Muhaya, Mingwu Zhang, Tsuyoshi Takagi: Efficient Identity-Based Signcryption in the Standard Model. ProvSec 2011: 120-137

Mingwu Zhang, Takashi Nishide, Bo Yang, Tsuyoshi Takagi: Anonymous Encryption with Partial-Order Subset Delegation Functionality. ProvSec 2011: 154-169

Bart Preneel, Tsuyoshi Takagi (Eds.): Cryptographic Hardware and Embedded Systems - CHES 2011 - 13th International Workshop, Nara, Japan, September 28 - October 1, 2011. Proceedings. Lecture Notes in Computer Science 6917, Springer 2011, isbn 978-3-642-23950-2

Yosuke Katoh, Yun-Ju Huang, Chen-Mou Cheng, Tsuyoshi Takagi: Efficient Implementation of the eta_T Pairing on GPU. IACR Cryptology ePrint Archive 2011: 540 (2011)

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, Ryuji Soga, Tsuyoshi Takagi, Ananda Vithanage, Hiroyasu Yamamoto: FPGA and ASIC implementations of the eta_T pairing in characteristic three. Computers & Electrical Engineering 36(1): 73-87 (2010)

Fagen Li, Masaaki Shirase, Tsuyoshi Takagi: Cryptanalysis of efficient proxy signature schemes for mobile communication. SCIENCE CHINA Information Sciences 53(10): 2016-2021 (2010)

Keisuke Hakuta, Hisayoshi Sato, Tsuyoshi Takagi: Efficient arithmetic on subfield elliptic curves over small finite fields of odd characteristic. J. Mathematical Cryptology 4(3): 199-238 (2010)

Tadashi Iyama, Shinsaku Kiyomoto, Kazuhide Fukushima, Toshiaki Tanaka, Tsuyoshi Takagi: Efficient Implementation of Pairing on BREW Mobile Phones. IWSEC 2010: 326-336

Mingwu Zhang, Bo Yang, Tsuyoshi Takagi, Yanping Shen, Wenzheng Zhang: Fuzzy Biometric Signcryption Scheme with Bilinear Pairings in the Standard Model. PAISI 2010: 77-87

Mingwu Zhang, Pengcheng Li, Bo Yang, Hao Wang, Tsuyoshi Takagi: Towards Confidentiality of ID-Based Signcryption Schemes under without Random Oracle Model. PAISI 2010: 98-104

Takuya Hayashi, Naoyuki Shinohara, Lihua Wang, Shin'ichiro Matsuo, Masaaki Shirase, Tsuyoshi Takagi: Solving a 676-Bit Discrete Logarithm Problem in GF(3⁶ⁿ). Public Key Cryptography 2010: 351-367

Takuya Hayashi, Naoyuki Shinohara, Lihua Wang, Shin'ichiro Matsuo, Masaaki Shirase, Tsuyoshi Takagi: Solving a 676-bit Discrete Logarithm Problem in GF(3⁶ⁿ). IACR Cryptology ePrint Archive 2010: 90 (2010)

Mingwu Zhang, Tsuyoshi Takagi, Bo Yang: On the Public Key Replacement and Universal Forgery Attacks of Short Certificateless Signature. IACR Cryptology ePrint Archive 2010: 256 (2010)

Eun-Kyung Ryu, Tsuyoshi Takagi: A hybrid approach for privacy-preserving RFID tags. Computer Standards & Interfaces 31(4): 812-815 (2009)

Chunhua Su, Feng Bao, Jianying Zhou, Tsuyoshi Takagi, Kouichi Sakurai: Security and Correctness Analysis on Privacy-Preserving k-Means Clustering Schemes. IEICE Transactions 92-A(4): 1246-1250 (2009)

Masaaki Shirase, Yukinori Miyazaki, Tsuyoshi Takagi, Dong-Guk Han, Dooho Choi: Efficient Implementation of Pairing-Based Cryptography on a Sensor Node. IEICE Transactions 92-D(5): 909-917 (2009)

Chunhua Su, Feng Bao, Jianying Zhou, Tsuyoshi Takagi, Kouichi Sakurai: Distributed Noise Generation for Density Estimation Based Clustering without Trusted Third Party. IEICE Transactions 92-A(8): 1868-1871 (2009)

Kaoru Kurosawa, Tsuyoshi Takagi: One-wayness equivalent to general factoring. IEEE Transactions on Information Theory 55(9): 4249-4262 (2009)

Fagen Li, Masaaki Shirase, Tsuyoshi Takagi: Identity-Based Hybrid Signcryption. ARES 2009: 534-539

Fagen Li, Masaaki Shirase, Tsuyoshi Takagi: Certificateless Hybrid Signcryption. ISPEC 2009: 112-123

Yuta Sasaki, Satsuki Nishina, Masaaki Shirase, Tsuyoshi Takagi: An Efficient Residue Group Multiplication for the eta_T Pairing over F_3^m. Selected Areas in Cryptography 2009: 364-375

Tsuyoshi Takagi, Masahiro Mambo (Eds.): Advances in Information and Computer Security, 4th International Workshop on Security, IWSEC 2009, Toyama, Japan, October 28-30, 2009, Proceedings. Lecture Notes in Computer Science 5824, Springer 2009, isbn 978-3-642-04845-6

Fagen Li, Masaaki Shirase, Tsuyoshi Takagi: Certificateless Hybrid Signcryption. IACR Cryptology ePrint Archive 2009: 162 (2009)

Fagen Li, Masaaki Shirase, Tsuyoshi Takagi: Identity-Based Hybrid Signcryption. IACR Cryptology ePrint Archive 2009: 455 (2009)

Masaaki Shirase, Tsuyoshi Takagi, Eiji Okamoto: Some Efficient Algorithms for the Final Exponentiation of eta^T Pairing. IEICE Transactions 91-A(1): 221-228 (2008)

Motoi Yoshitomi, Tsuyoshi Takagi, Shinsaku Kiyomoto, Toshiaki Tanaka: Efficient Implementation of the Pairing on Mobilephones Using BREW. IEICE Transactions 91-D(5): 1330-1337 (2008)

Toshiya Nakajima, Tetsuya Izu, Tsuyoshi Takagi: Reduction Optimal Trinomials for Efficient Software Implementation of the eta_T Pairing. IEICE Transactions 91-A(9): 2379-2386 (2008)

Masaaki Shirase, Dong-Guk Han, Yasushi Hibino, Howon Kim, Tsuyoshi Takagi: A More Compact Representation of XTR Cryptosystem. IEICE Transactions 91-A(10): 2843-2850 (2008)

Camille Vuillaume, Katsuyuki Okeya, Tsuyoshi Takagi: Short-Memory Scalar Multiplication for Koblitz Curves. IEEE Trans. Computers 57(4): 481-489 (2008)

Jean-Luc Beuchat, Nicolas Brisebarre, Jérémie Detrey, Eiji Okamoto, Masaaki Shirase, Tsuyoshi Takagi: Algorithms and Arithmetic Operators for Computing the etaT Pairing in Characteristic Three. IEEE Trans. Computers 57(11): 1454-1468 (2008)

Chunhua Su, Feng Bao, Jianying Zhou, Tsuyoshi Takagi, Kouichi Sakurai: A New Scheme for Distributed Density Estimation based Privacy-Preserving Clustering. ARES 2008: 112-119

Kyosuke Osaka, Shuang Chang, Tsuyoshi Takagi, Kenichi Yamazaki, Osamu Takahashi: A Secure RFID Protocol based on Insubvertible Encryption Using Guardian Proxy. ARES 2008: 733-740

Fagen Li, Masaaki Shirase, Tsuyoshi Takagi: On the Security of Online/Offline Signatures and Multisignatures from ACISP'06. CANS 2008: 108-119

Fagen Li, Masaaki Shirase, Tsuyoshi Takagi: Efficient Signcryption Key Encapsulation without Random Oracles. Inscrypt 2008: 47-59

Fagen Li, Masaaki Shirase, Tsuyoshi Takagi: Efficient Multi-PKG ID-Based Signcryption for Ad Hoc Networks. Inscrypt 2008: 289-304

Masaaki Shirase, Tsuyoshi Takagi, Eiji Okamoto: An Efficient Countermeasure against Side Channel Attacks for Pairing Computation. ISPEC 2008: 290-303

Keisuke Hakuta, Hisayoshi Sato, Tsuyoshi Takagi: Efficient Arithmetic on Subfield Elliptic Curves over Small Finite Fields of Odd Characteristic. ISPEC 2008: 304-318

Akira Otaka, Tsuyoshi Takagi, Osamu Takahashi: Network Forensics on Mobile Ad-Hoc Networks. KES (3) 2008: 175-182

Fagen Li, Masaaki Shirase, Tsuyoshi Takagi: Key Management Using Certificateless Public Key Cryptography in Ad Hoc Networks. NPC 2008: 116-126

Yuto Kawahara, Kazumaro Aoki, Tsuyoshi Takagi: Faster Implementation of eta-T Pairing over GF(3^m) Using Minimum Number of Logical Instructions for GF(3)-Addition. Pairing 2008: 282-296

Erik Dahmen, Katsuyuki Okeya, Tsuyoshi Takagi, Camille Vuillaume: Digital Signatures Out of Second-Preimage Resistant Hash Functions. PQCrypto 2008: 109-123

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, Ryuji Soga, Tsuyoshi Takagi, Ananda Vithanage, Hiroyasu Yamamoto: FPGA and ASIC Implementations of the eta_T Pairing in Characteristic Three. IACR Cryptology ePrint Archive 2008: 280 (2008)

Fagen Li, Masaaki Shirase, Tsuyoshi Takagi: Analysis and Improvement of Authenticatable Ring Signcryption Scheme. IACR Cryptology ePrint Archive 2008: 373 (2008)

Erik Dahmen, Katsuyuki Okeya, Tsuyoshi Takagi: A New Upper Bound for the Minimal Density of Joint Representations in Elliptic Curve Cryptosystems. IEICE Transactions 90-A(5): 952-959 (2007)

Masaaki Shirase, Dong-Guk Han, Yasushi Hibino, Ho Won Kim, Tsuyoshi Takagi: Compressed XTR. ACNS 2007: 420-431

Chunhua Su, Feng Bao, Jianying Zhou, Tsuyoshi Takagi, Kouichi Sakurai: Privacy-Preserving Two-Party K-Means Clustering via Secure Approximation. AINA Workshops (1) 2007: 385-391

Eun-Kyung Ryu, Tsuyoshi Takagi: Efficient Conjunctive Keyword-Searchable Encryption. AINA Workshops (1) 2007: 409-414

Jean-Luc Beuchat, Masaaki Shirase, Tsuyoshi Takagi, Eiji Okamoto: An Algorithm for the nt Pairing Calculation in Characteristic Three and its Hardware Implementation. IEEE Symposium on Computer Arithmetic 2007: 97-104

Chunhua Su, Jianying Zhou, Feng Bao, Tsuyoshi Takagi, Kouichi Sakurai: Two-Party Privacy-Preserving Agglomerative Document Clustering. ISPEC 2007: 193-208

Masaaki Shirase, Tsuyoshi Takagi, Eiji Okamoto: Some Efficient Algorithms for the Final Exponentiation of eta _T Pairing. ISPEC 2007: 254-268

Toshiya Nakajima, Tetsuya Izu, Tsuyoshi Takagi: Reduction Optimal Trinomials for Efficient Software Implementation of the eta_T Pairing. IWSEC 2007: 44-57

Jean-Luc Beuchat, Nicolas Brisebarre, Masaaki Shirase, Tsuyoshi Takagi, Eiji Okamoto: A Coprocessor for the Final Exponentiation of the eta _T Pairing in Characteristic Three. WAIFI 2007: 25-39

Masaaki Shirase, Yuto Kawahara, Tsuyoshi Takagi, Eiji Okamoto: Universal eta_T Pairing Algorithm over Arbitrary Extension Degree. WISA 2007: 1-15

Motoi Yoshitomi, Tsuyoshi Takagi, Shinsaku Kiyomoto, Toshiaki Tanaka: Efficient Implementation of the Pairing on Mobilephones Using BREW. WISA 2007: 203-214

Tsuyoshi Takagi, Tatsuaki Okamoto, Eiji Okamoto, Takeshi Okamoto (Eds.): Pairing-Based Cryptography - Pairing 2007, First International Conference, Tokyo, Japan, July 2-4, 2007, Proceedings. Lecture Notes in Computer Science 4575, Springer 2007, isbn 978-3-540-73488-8

Jean-Luc Beuchat, Nicolas Brisebarre, Masaaki Shirase, Tsuyoshi Takagi, Eiji Okamoto: A Coprocessor for the Final Exponentiation of the eta_T Pairing in Characteristic Three. IACR Cryptology ePrint Archive 2007: 45 (2007)

Jean-Luc Beuchat, Masaaki Shirase, Tsuyoshi Takagi, Eiji Okamoto: A Refined Algorithm for the eta_T Pairing Calculation in Characteristic Three. IACR Cryptology ePrint Archive 2007: 311 (2007)

Motoi Yoshitomi, Tsuyoshi Takagi, Shinsaku Kiyomoto, Toshiaki Tanaka: Efficient Implementation of the Pairing on Mobilephones using BREW. IACR Cryptology ePrint Archive 2007: 340 (2007)

Jean-Luc Beuchat, Nicolas Brisebarre, Jérémie Detrey, Eiji Okamoto, Masaaki Shirase, Tsuyoshi Takagi: Algorithms and Arithmetic Operators for Computing the eta_T Pairing in Characteristic Three. IACR Cryptology ePrint Archive 2007: 417 (2007)

Hisayoshi Sato, Tsuyoshi Takagi, Satoru Tezuka, Kazuo Takaragi: Generalized Powering Functions and Their Application to Digital Signatures. IEICE Transactions 89-A(1): 81-89 (2006)

Tsuyoshi Takagi, David Reis Jr., Sung-Ming Yen, Bo-Ching Wu: Radix-r Non-Adjacent Form and Its Application to Pairing-Based Cryptosystem. IEICE Transactions 89-A(1): 115-123 (2006)

Masanobu Katagi, Toru Akishita, Izuru Kitamura, Tsuyoshi Takagi: Efficient Hyperelliptic Curve Cryptosystems Using Theta Divisors. IEICE Transactions 89-A(1): 151-160 (2006)

Katsuyuki Okeya, Tsuyoshi Takagi, Camille Vuillaume: Security Analysis of the SPA-Resistant Fractional Width Method. IEICE Transactions 89-A(1): 161-168 (2006)

Camille Vuillaume, Katsuyuki Okeya, Tsuyoshi Takagi: Defeating Simple Power Analysis on Koblitz Curves. IEICE Transactions 89-A(5): 1362-1369 (2006)

Katsuyuki Okeya, Tsuyoshi Takagi: Security analysis of CRT-based cryptosystems. Int. J. Inf. Sec. 5(3): 177-185 (2006)

Katja Schmidt-Samoa, Olivier Semay, Tsuyoshi Takagi: Analysis of Fractional Window Recoding Methods and Their Application to Elliptic Curve Cryptosystems. IEEE Trans. Computers 55(1): 48-57 (2006)

Kaoru Kurosawa, Tsuyoshi Takagi: New Approach for Selectively Convertible Undeniable Signature Schemes. ASIACRYPT 2006: 428-443

Tae Hyun Kim, Tsuyoshi Takagi, Dong-Guk Han, Ho Won Kim, Jongin Lim: Side Channel Attacks and Countermeasures on Pairing Based Cryptosystems over Binary Fields. CANS 2006: 168-181

Toru Akishita, Tsuyoshi Takagi: Power Analysis to ECC Using Differential Power Between Multiplication and Squaring. CARDIS 2006: 151-164

Yuto Kawahara, Tsuyoshi Takagi, Eiji Okamoto: Efficient Implementation of Tate Pairing on a Mobile Phone Using Java. CIS 2006: 396-405

Kyosuke Osaka, Tsuyoshi Takagi, Kenichi Yamazaki, Osamu Takahashi: An Efficient and Secure RFID Security Method with Ownership Transfer. CIS 2006: 778-787

Dong-Guk Han, Tsuyoshi Takagi, Howon Kim, Kyoil Chung: New Security Problem in RFID Systems "Tag Killing". ICCSA (3) 2006: 375-384

Dong-Guk Han, Tsuyoshi Takagi, Jongin Lim: Further Security Analysis of XTR. ISPEC 2006: 33-44

Tae Hyun Kim, Tsuyoshi Takagi, Dong-Guk Han, Ho Won Kim, Jongin Lim: Side Channel Attacks and Countermeasures on Pairing Based Cryptosystems over Binary Fields. IACR Cryptology ePrint Archive 2006: 243 (2006)

Yuto Kawahara, Tsuyoshi Takagi, Eiji Okamoto: Efficient Implementation of Tate Pairing on a Mobile Phone using Java. IACR Cryptology ePrint Archive 2006: 299 (2006)

Jean-Luc Beuchat, Masaaki Shirase, Tsuyoshi Takagi, Eiji Okamoto: An Algorithm for the η_T Pairing Calculation in Characteristic Three and its Hardware Implementation. IACR Cryptology ePrint Archive 2006: 327 (2006)

Masaaki Shirase, Tsuyoshi Takagi, Eiji Okamoto: Some Efficient Algorithms for the Final Exponentiation of η_T Pairing. IACR Cryptology ePrint Archive 2006: 431 (2006)

Katsuyuki Okeya, Tsuyoshi Takagi, Camille Vuillaume: On the Importance of Protecting in SFLASH against Side Channel Attacks. IEICE Transactions 88-A(1): 123-131 (2005)

Toru Akishita, Tsuyoshi Takagi: Zero-Value Register Attack on Elliptic Curve Cryptosystem. IEICE Transactions 88-A(1): 132-139 (2005)

Toru Akishita, Tsuyoshi Takagi: On the Optimal Parameter Choice for Elliptic Curve Cryptosystems Using Isogeny. IEICE Transactions 88-A(1): 140-146 (2005)

Tetsuya Izu, Tsuyoshi Takagi: Fast Elliptic Curve Multiplications Resistant against Side Channel Attacks. IEICE Transactions 88-A(1): 161-171 (2005)

Izuru Kitamura, Masanobu Katagi, Tsuyoshi Takagi: A Complete Divisor Class Halving Algorithm for Hyperelliptic Curve Cryptosystems of Genus Two. ACISP 2005: 146-157

Katsuyuki Okeya, Tsuyoshi Takagi, Camille Vuillaume: Efficient Representations on Koblitz Curves with Resistance to Side Channel Attacks. ACISP 2005: 218-229

Raylin Tso, Takeshi Okamoto, Tsuyoshi Takagi, Eiji Okamoto: An id-based non-interactive tripartite key agreement protocol with K-resilience. Communications and Computer Networks 2005: 38-42

Katsuyuki Okeya, Tsuyoshi Takagi, Camille Vuillaume: Short Memory Scalar Multiplication on Koblitz Curves. CHES 2005: 91-105

Lihua Wang, Takeshi Okamoto, Tsuyoshi Takagi, Eiji Okamoto: Insider Impersonation-MIM Attack to Tripartite Key Agreement Scheme and an Efficient Protocol for Multiple Keys. CIS (2) 2005: 198-203

Erik Dahmen, Katsuyuki Okeya, Tsuyoshi Takagi: An Advanced Method for Joint Scalar Multiplications on Memory Constraint Devices. ESAS 2005: 189-204

Dong-Guk Han, Tsuyoshi Takagi, Tae Hyun Kim, Howon Kim, Kyoil Chung: Collision Attack on XTR and a Countermeasure with a Fixed Pattern. EUC Workshops 2005: 864-873

Katja Schmidt-Samoa, Tsuyoshi Takagi: Paillier's Cryptosystem Modulo p²q and Its Applications to Trapdoor Commitment Schemes. Mycrypt 2005: 296-313

Dong-Guk Han, Tsuyoshi Takagi, Tae Hyun Kim, Ho Won Kim, Kyoil Chung: Collision Attack on XTR and a Countermeasure with a Fixed Pattern. IACR Cryptology ePrint Archive 2005: 316 (2005)

Kaoru Kurosawa, Tsuyoshi Takagi: One-Wayness Equivalent to General Factoring. IACR Cryptology ePrint Archive 2005: 382 (2005)

Dong-Guk Han, Tetsuya Izu, Tsuyoshi Takagi: Some Explicit Formulae of NAF and its Left-to-Right Analogue. IACR Cryptology ePrint Archive 2005: 384 (2005)

Dong-Guk Han, Tsuyoshi Takagi: Some Analysis of Radix-r Representations. IACR Cryptology ePrint Archive 2005: 402 (2005)

Keisuke Hakuta, Hisayoshi Sato, Tsuyoshi Takagi: Efficient Arithmetic on Subfield Elliptic Curves over Small Odd Characteristics. IACR Cryptology ePrint Archive 2005: 454 (2005)

Ingrid Biehl, Sachar Paulus, Tsuyoshi Takagi: Efficient Undeniable Signature Schemes Based on Ideal Arithmetic in Quadratic Orders. Des. Codes Cryptography 31(2): 99-123 (2004)

Katsuyuki Okeya, Tsuyoshi Takagi: SCA-Resistant and Fast Elliptic Scalar Multiplication Based on wNAF. IEICE Transactions 87-A(1): 75-84 (2004)

Tetsuya Izu, Tsuyoshi Takagi: Fast Elliptic Curve Multiplications with SIMD Operations. IEICE Transactions 87-A(1): 85-93 (2004)

Tsuyoshi Takagi: A Fast RSA-Type Public-Key Primitive Modulo p^kq Using Hensel Lifting. IEICE Transactions 87-A(1): 94-101 (2004)

Katsuyuki Okeya, Tsuyoshi Takagi, Camille Vuillaume: On the Exact Flexibility of the Flexible Countermeasure Against Side Channel Attacks. ACISP 2004: 466-477

Katsuyuki Okeya, Tsuyoshi Takagi: Security Analysis of CRT-Based Cryptosystems. ACNS 2004: 383-397

Katsuyuki Okeya, Katja Schmidt-Samoa, Christian Spahn, Tsuyoshi Takagi: Signed Binary Representations Revisited. CRYPTO 2004: 123-139

Tsutomu Sawada, Tsuyoshi Takagi, Yukiko Hoshino, Masahiro Fujita: Learning behavior selection through interaction based on emotionally grounded symbol concept. Humanoids 2004: 450-469

Masanobu Katagi, Toru Akishita, Izuru Kitamura, Tsuyoshi Takagi: Some Improved Algorithms for Hyperelliptic Curve Cryptosystems Using Degenerate Divisors. ICISC 2004: 296-312

Yukiko Hoshino, Tsuyoshi Takagi, Ugo Di Profio, Masahiro Fujita: Behavior Description and Control using Behavior Module for Personal Robot. ICRA 2004: 4165-4171

David Galindo, Sebastià Martín Molleví, Tsuyoshi Takagi, Jorge Luis Villar: A Provably Secure Elliptic Curve Scheme with Fast Encryption. INDOCRYPT 2004: 245-259

Hisayoshi Sato, Daniel Schepers, Tsuyoshi Takagi: Exact Analysis of Montgomery Multiplication. INDOCRYPT 2004: 290-304

Tsutomu Sawada, Tsuyoshi Takagi, Masahiro Fujita: Behavior selection and motion modulation in emotionally grounded architecture for QRIO SDR-4XII. IROS 2004: 2514-2519

Tsuyoshi Takagi, Sung-Ming Yen, Bo-Ching Wu: Radix-r Non-Adjacent Form. ISC 2004: 99-110

Katsuyuki Okeya, Tsuyoshi Takagi, Camille Vuillaume: On the Importance of Protecting Delta in SFLASH against Side Channel Attacks. ITCC (2) 2004: 560-568

Toru Akishita, Tsuyoshi Takagi: On the Optimal Parameter Choice for Elliptic Curve Cryptosystems Using Isogeny. Public Key Cryptography 2004: 346-359

Masanobu Katagi, Izuru Kitamura, Toru Akishita, Tsuyoshi Takagi: Novel Efficient Implementations of Hyperelliptic Curve Cryptosystems Using Degenerate Divisors. WISA 2004: 345-359

Katsuyuki Okeya, Katja Schmidt-Samoa, Christian Spahn, Tsuyoshi Takagi: Signed Binary Representations Revisited. IACR Cryptology ePrint Archive 2004: 195 (2004)

Izuru Kitamura, Masanobu Katagi, Tsuyoshi Takagi: A Complete Divisor Class Halving Algorithm for Hyperelliptic Curve Cryptosystems of Genus Two. IACR Cryptology ePrint Archive 2004: 255 (2004)

Ronald C. Arkin, Masahiro Fujita, Tsuyoshi Takagi, Rika Hasegawa: An ethological and emotional basis for human-robot interaction. Robotics and Autonomous Systems 42(3-4): 191-201 (2003)

Kaoru Kurosawa, Tsuyoshi Takagi: Some RSA-Based Encryption Schemes with Tight Security Reduction. ASIACRYPT 2003: 19-36

Hisayoshi Sato, Tsuyoshi Takagi, Satoru Tezuka, Kazuo Takaragi: Generalized Powering Functions and Their Application to Digital Signatures. ASIACRYPT 2003: 434-451

Kaoru Kurosawa, Katja Schmidt-Samoa, Tsuyoshi Takagi: A Complete and Explicit Security Reduction Algorithm for RSA-Based Cryptosystems. ASIACRYPT 2003: 474-491

Katsuyuki Okeya, Tsuyoshi Takagi: A More Flexible Countermeasure against Side Channel Attacks Using Window Method. CHES 2003: 397-410

Katsuyuki Okeya, Tsuyoshi Takagi: The Width-w NAF Method Provides Small Memory and Fast Elliptic Scalar Multiplications Secure against Side Channel Attacks. CT-RSA 2003: 328-342

Toru Akishita, Tsuyoshi Takagi: Zero-Value Point Attacks on Elliptic Curve Cryptosystem. ISC 2003: 218-233

Tetsuya Izu, Tsuyoshi Takagi: Exceptional Procedure Attack on Elliptic Curve Cryptosystems. Public Key Cryptography 2003: 224-239

Kaoru Kurosawa, Tsuyoshi Takagi: Some RSA-based Encryption Schemes with Tight Security Reduction. IACR Cryptology ePrint Archive 2003: 157 (2003)

Masanobu Katagi, Izuru Kitamura, Toru Akishita, Tsuyoshi Takagi: Novel Efficient Implementations of Hyperelliptic Curve Cryptosystems using Degenerate Divisors. IACR Cryptology ePrint Archive 2003: 203 (2003)

Ingrid Biehl, Tsuyoshi Takagi: A New Distributed Primality Test for Shared RSA Keys Using Quadratic Fields. ACISP 2002: 1-16

Kouichi Sakurai, Tsuyoshi Takagi: On the Security of a Modified Paillier Public-Key Primitive. ACISP 2002: 436-448

Tetsuya Izu, Tsuyoshi Takagi: Fast Elliptic Curve Multiplications with SIMD Operations. ICICS 2002: 217-230

Tetsuya Izu, Tsuyoshi Takagi: Efficient Computations of the Tate Pairingfor the Large MOV Degrees. ICISC 2002: 283-297

Kouichi Sakurai, Tsuyoshi Takagi: A Reject Timing Attackon an IND-CCA2 Public-Key Cryptosystem. ICISC 2002: 359-373

Tetsuya Izu, Bodo Möller, Tsuyoshi Takagi: Improved Elliptic Curve Multiplication Methods Resistant against Side Channel Attacks. INDOCRYPT 2002: 296-313

Kouichi Sakurai, Tsuyoshi Takagi: New Semantically Secure Public-Key Cryptosystems from the RSA-Primitive. Public Key Cryptography 2002: 1-16

Tetsuya Izu, Tsuyoshi Takagi: A Fast Parallel Elliptic Curve Multiplication Resistant against Side Channel Attacks. Public Key Cryptography 2002: 280-296

Marc Joye, Jean-Jacques Quisquater, Tsuyoshi Takagi: How to Choose Secret Parameters for RSA-Type Cryptosystems over Elliptic Curves. Des. Codes Cryptography 23(3): 297-316 (2001)

Masahiro Fujita, Gabriel Costa, Rika Hasegawa, Tsuyoshi Takagi, Jun Yokono, Hideki Shimomura: Architecture and preliminary experimental results for emotionally grounded symbol acquisition. Agents 2001: 35-36

Johannes Buchmann, Kouichi Sakurai, Tsuyoshi Takagi: An IND-CCA2 Public-Key Cryptosystem with Fast Decryption. ICISC 2001: 51-71

Ronald C. Arkin, Masahiro Fujita, Tsuyoshi Takagi, Rika Hasegawa: Ethological Modeling and Architecture for an Entertainment Robot. ICRA 2001: 453-458

Sachar Paulus, Tsuyoshi Takagi: A New Public-Key Cryptosystem over a Quadratic Order with Quadratic Decryption Time. J. Cryptology 13(2): 263-272 (2000)

Detlef Hühnlein, Tsuyoshi Takagi: Reducing Logarithms in Totally Non-maximal Imaginary Quadratic Orders to Logarithms in Finite Fields. ASIACRYPT 1999: 219-231

Michael Hartmann, Sachar Paulus, Tsuyoshi Takagi: NICE - New Ideal Coset Encryption. CHES 1999: 328-339

Tsuyoshi Takagi: Fast RSA-Type Cryptosystem Modulo p^kq. CRYPTO 1998: 318-326

Detlef Hühnlein, Michael J. Jacobson Jr., Sachar Paulus, Tsuyoshi Takagi: A Cryptosystem Based on Non-maximal Imaginary Quadratic Orders with Fast Decryption. EUROCRYPT 1998: 294-307

Sachar Paulus, Tsuyoshi Takagi: A generalization of the Diffie-Hellman problem and related cryptosystems allowing fast decryption. ICISC 1998: 211-220

Detlef Hühnlein, Andreas Meyer, Tsuyoshi Takagi: Rabin and RSA analogues based on non-maximal imaginary quadratic orders. ICISC 1998: 221-240

Tsuyoshi Takagi: Fast RSA-Type Cryptosystems Using N-Adic Expansion. CRYPTO 1997: 372-384

Tsuyoshi Takagi, Shozo Naito: The Multi-variable Modular Polynomial and Its Applications to Cryptography. ISAAC 1996: 386-396