Kazuo Ohta

Mitsuhiro Hattori, Takato Hirano, Takashi Ito, Nori Matsuda, Takumi Mori, Yusuke Sakai, Kazuo Ohta: Ciphertext-Policy Delegatable Hidden Vector Encryption and Its Application. IEICE Transactions 96-A(1): 53-67 (2013)

Yang Li, Kazuo Ohta, Kazuo Sakiyama: A New Type of Fault-Based Attack: Fault Behavior Analysis. IEICE Transactions 96-A(1): 177-184 (2013)

Lei Wang, Yu Sasaki, Wataru Komatsubara, Kazuo Sakiyama, Kazuo Ohta: Meet-in-the-Middle (Second) Preimage Attacks on Two Double-Branch Hash Functions RIPEMD and RIPEMD-128. IEICE Transactions 95-A(1): 100-110 (2012)

Yang Li, Kazuo Ohta, Kazuo Sakiyama: Toward Effective Countermeasures against an Improved Fault Sensitivity Analysis. IEICE Transactions 95-A(1): 234-241 (2012)

Yang Li, Kazuo Ohta, Kazuo Sakiyama: New Fault-Based Side-Channel Attack Using Fault Sensitivity. IEEE Transactions on Information Forensics and Security 7(1): 88-97 (2012)

Kazuo Sakiyama, Yang Li, Mitsugu Iwamoto, Kazuo Ohta: Information-Theoretic Approach to Optimal Differential Fault Analysis. IEEE Transactions on Information Forensics and Security 7(1): 109-120 (2012)

Miroslav Knezevic, Kazuyuki Kobayashi, Jun Ikegami, Shin'ichiro Matsuo, Akashi Satoh, Ünal Koçabas, Junfeng Fan, Toshihiro Katashita, Takeshi Sugawara, Kazuo Sakiyama, Ingrid Verbauwhede, Kazuo Ohta, Naofumi Homma, Takafumi Aoki: Fair and Consistent Hardware Evaluation of Fourteen Round Two SHA-3 Candidates. IEEE Trans. VLSI Syst. 20(5): 827-840 (2012)

Yu Sasaki, Lei Wang, Yasuhide Sakai, Kazuo Sakiyama, Kazuo Ohta: Three-Subset Meet-in-the-Middle Attack on Reduced XTEA. AFRICACRYPT 2012: 138-154

Sho Endo, Yang Li, Naofumi Homma, Kazuo Sakiyama, Kazuo Ohta, Takafumi Aoki: An Efficient Countermeasure against Fault Sensitivity Analysis Using Configurable Delay Blocks. FDTC 2012: 95-102

Toshiki Nakasone, Yang Li, Yu Sasaki, Mitsugu Iwamoto, Kazuo Ohta, Kazuo Sakiyama: Key-Dependent Weakness of AES-Based Ciphers under Clockwise Collision Distinguisher. ICISC 2012: 395-409

Takuma Koyama, Lei Wang, Yu Sasaki, Kazuo Sakiyama, Kazuo Ohta: New Truncated Differential Cryptanalysis on 3D Block Cipher. ISPEC 2012: 109-125

Yu Sasaki, Lei Wang, Yasuhiro Takasaki, Kazuo Sakiyama, Kazuo Ohta: Boomerang Distinguishers for Full HAS-160 Compression Function. IWSEC 2012: 156-169

Lei Wang, Yu Sasaki, Kazuo Sakiyama, Kazuo Ohta: Polynomial-Advantage Cryptanalysis of 3D Cipher and 3D-Based Hash Function. IWSEC 2012: 170-181

Yusuke Sakai, Jacob C. N. Schuldt, Keita Emura, Goichiro Hanaoka, Kazuo Ohta: On the Security of Dynamic Group Signatures: Preventing Signature Hijacking. Public Key Cryptography 2012: 715-732

Yusuke Sakai, Jacob C. N. Schuldt, Keita Emura, Goichiro Hanaoka, Kazuo Ohta: On the Security of Dynamic Group Signatures: Preventing Signature Hijacking. IACR Cryptology ePrint Archive 2012: 431 (2012)

Yusuke Naito, Kazuki Yoneyama, Lei Wang, Kazuo Ohta: Security of Cryptosystems Using Merkle-Damgård in the Random Oracle Model. IEICE Transactions 94-A(1): 57-70 (2011)

Bagus Santoso, Kazuo Ohta, Kazuo Sakiyama, Goichiro Hanaoka: An Efficient Authentication for Lightweight Devices by Perfecting Zero-Knowledgeness. IEICE Transactions 94-A(1): 92-103 (2011)

Yang Li, Kazuo Sakiyama, Shin-ichi Kawamura, Kazuo Ohta: Power Analysis against a DPA-Resistant S-Box Implementation Based on the Fourier Transform. IEICE Transactions 94-A(1): 191-199 (2011)

Fuminori Sakai, Kazuo Ohta, Kunio Sawaya: Ultra-Wideband Array Antenna Utilizing Novel Scanning System with Tapped Delay Lines for Short Range Radar. IEICE Transactions 94-B(5): 1194-1200 (2011)

Kazuki Yoneyama, Masayuki Terada, Sadayuki Hongo, Kazuo Ohta: Universally Composable NBAC-Based Fair Voucher Exchange for Mobile Environments. IEICE Transactions 94-A(6): 1263-1273 (2011)

Yusuke Sakai, Goichiro Hanaoka, Kaoru Kurosawa, Kazuo Ohta: How to Shorten a Ciphertext of Reproducible Key Encapsulation Mechanisms in the Random Oracle Model. IEICE Transactions 94-A(6): 1293-1305 (2011)

Mebae Ushida, Yutaka Kawai, Kazuki Yoneyama, Kazuo Ohta: Proxiable Designated Verifier Signature. JIP 19: 430-440 (2011)

Tetsuya Izu, Masami Izumi, Noboru Kunihiro, Kazuo Ohta: Yet Another Sanitizable and Deletable Signatures. AINA Workshops 2011: 574-579

Amir Moradi, Oliver Mischke, Christof Paar, Yang Li, Kazuo Ohta, Kazuo Sakiyama: On the Power of Fault Sensitivity Analysis and Collision Side-Channel Attacks in a Combined Setting. CHES 2011: 292-311

Dai Yamamoto, Kazuo Sakiyama, Mitsugu Iwamoto, Kazuo Ohta, Takao Ochiai, Masahiko Takenaka, Kouichi Itoh: Uniqueness Enhancement of PUF Responses Based on the Locations of Random Outputting RS Latches. CHES 2011: 390-406

Lei Wang, Yu Sasaki, Wataru Komatsubara, Kazuo Ohta, Kazuo Sakiyama: (Second) Preimage Attacks on Step-Reduced RIPEMD/RIPEMD-128 with a New Local-Collision Approach. CT-RSA 2011: 197-212

Yoshikazu Hanatani, Miyako Ohkubo, Shin'ichiro Matsuo, Kazuo Sakiyama, Kazuo Ohta: A Study on Computational Formal Verification for Practical Cryptographic Protocol: The Case of Synchronous RFID Authentication. Financial Cryptography Workshops 2011: 70-87

Hikaru Sakamoto, Yang Li, Kazuo Ohta, Kazuo Sakiyama: Fault Sensitivity Analysis Against Elliptic Curve Cryptosystems. FDTC 2011: 11-20

Yang Li, Kazuo Ohta, Kazuo Sakiyama: Revisit fault sensitivity analysis on WDDL-AES. HOST 2011: 148-153

Mitsuhiro Hattori, Takato Hirano, Takashi Ito, Nori Matsuda, Takumi Mori, Yusuke Sakai, Kazuo Ohta: Ciphertext-Policy Delegatable Hidden Vector Encryption and Its Application to Searchable Encryption in Multi-user Setting. IMA Int. Conf. 2011: 190-209

Mitsugu Iwamoto, Kazuo Ohta: Security notions for information theoretically secure encryptions. ISIT 2011: 1777-1781

Yu Sasaki, Naoyuki Takayanagi, Kazuo Sakiyama, Kazuo Ohta: Experimental Verification of Super-Sbox Analysis - Confirmation of Detailed Attack Complexity. IWSEC 2011: 178-192

Yusuke Naito, Kazuki Yoneyama, Lei Wang, Kazuo Ohta: Security of Practical Cryptosystems Using Merkle-Damgård Hash Function in the Ideal Cipher Model. ProvSec 2011: 281-296

Mitsugu Iwamoto, Kazuo Ohta: Security Notions for Information Theoretically Secure Encryptions. CoRR abs/1106.1731 (2011)

Yang Li, Daisuke Nakatsu, Qi Li, Kazuo Ohta, Kazuo Sakiyama: Clockwise Collision Analysis - Overlooked Side-Channel Leakage Inside Your Measurements. IACR Cryptology ePrint Archive 2011: 579 (2011)

Yu Sasaki, Lei Wang, Kazuo Ohta, Kazumaro Aoki, Noboru Kunihiro: Practical Password Recovery Attacks on MD4 Based Prefix and Hybrid Authentication Protocols. IEICE Transactions 93-A(1): 84-92 (2010)

Kazuo Sakiyama, Kazuo Ohta: On Clock-Based Fault Analysis Attack for an AES Hardware Using RSL. IEICE Transactions 93-A(1): 172-179 (2010)

Lei Wang, Kazuo Ohta, Yu Sasaki, Kazuo Sakiyama, Noboru Kunihiro: Cryptanalysis of Two MD5-Based Authentication Protocols: APOP and NMAC. IEICE Transactions 93-D(5): 1087-1095 (2010)

Yutaka Kawai, Shotaro Tanno, Takahiro Kondo, Kazuki Yoneyama, Kazuo Ohta, Noboru Kunihiro: Extension of Secret Handshake Protocols with Multiple Groups in Monotone Condition. IEICE Transactions 93-A(6): 1122-1131 (2010)

Mebae Ushida, Tetsuya Izu, Masahiko Takenaka, Kazuo Ohta: Multiple Designated Verifiers Signatures Reconsidered. ARES 2010: 586-590

Yu Sasaki, Yang Li, Lei Wang, Kazuo Sakiyama, Kazuo Ohta: Non-full-active Super-Sbox Analysis: Applications to ECHO and Grøstl. ASIACRYPT 2010: 38-55

Yang Li, Kazuo Sakiyama, Shigeto Gomisawa, Toshinori Fukunaga, Junko Takahashi, Kazuo Ohta: Fault Sensitivity Analysis. CHES 2010: 320-334

Kazuki Yoneyama, Mebae Ushida, Kazuo Ohta: Rigorous Security Requirements for Designated Verifier Signatures. Inscrypt 2010: 318-335

Bagus Santoso, Kazuo Ohta, Kazuo Sakiyama, Goichiro Hanaoka: Improving Efficiency of an ‘On the Fly' Identification Scheme by Perfecting Zero-Knowledgeness. CT-RSA 2010: 284-301

Masami Izumi, Jun Ikegami, Kazuo Sakiyama, Kazuo Ohta: Improved countermeasure against Address-bit DPA for ECC scalar multiplication. DATE 2010: 981-984

Yang Li, Kazuo Sakiyama, Lejla Batina, Daisuke Nakatsu, Kazuo Ohta: Power Variance Analysis breaks a masked ASIC implementation of AES. DATE 2010: 1059-1064

Kazuyuki Kobayashi, Jun Ikegami, Kazuo Sakiyama, Kazuo Ohta, Miroslav Knezevic, Ünal Koçabas, Junfeng Fan, Ingrid Verbauwhede, Eric Xu Guo, Shin'ichiro Matsuo, Sinan Huang, Leyla Nazhandali, Akashi Satoh: Prototyping Platform for Performance Evaluation of SHA-3 Candidates. HOST 2010: 60-63

Kazuki Yoneyama, Masayuki Terada, Sadayuki Hongo, Kazuo Ohta: Universally Composable NBAC-Based Fair Voucher Exchange for Mobile Environments. IWSEC (Short Papers) 2010: 42-59

Yusuke Sakai, Goichiro Hanaoka, Kaoru Kurosawa, Kazuo Ohta: A Generic Method for Reducing Ciphertext Length of Reproducible KEMs in the RO Model. IWSEC 2010: 55-69

Naoyuki Hirota, Tetsuya Izu, Noboru Kunihiro, Kazuo Ohta: An Evaluation of the Sieving Device YASD for 1024-Bit Integers. NBiS 2010: 546-551

Mebae Ushida, Kazuo Ohta, Yutaka Kawai, Kazuki Yoneyama: Proxiable Designated Verifier Signature. SECRYPT 2010: 344-353

Daisuke Nakatsu, Yang Li, Kazuo Sakiyama, Kazuo Ohta: Combination of SW Countermeasure and CPU Modification on FPGA against Power Analysis. WISA 2010: 258-272

Kazuyuki Kobayashi, Jun Ikegami, Shin'ichiro Matsuo, Kazuo Sakiyama, Kazuo Ohta: Evaluation of Hardware Performance for the SHA-3 Candidates Using SASEBO-GII. IACR Cryptology ePrint Archive 2010: 10 (2010)

Yang Li, Shigeto Gomisawa, Kazuo Sakiyama, Kazuo Ohta: An Information Theoretic Perspective on the Differential Fault Analysis against AES. IACR Cryptology ePrint Archive 2010: 32 (2010)

Shigeto Gomisawa, Yang Li, Junko Takahashi, Toshinori Fukunaga, Yu Sasaki, Kazuo Sakiyama, Kazuo Ohta: Efficient Differential Fault Analysis for AES. IACR Cryptology ePrint Archive 2010: 336 (2010)

Miyako Ohkubo, Shin'ichiro Matsuo, Yoshikazu Hanatani, Kazuo Sakiyama, Kazuo Ohta: Robust RFID Authentication Protocol with Formal Proof and Its Feasibility. IACR Cryptology ePrint Archive 2010: 345 (2010)

Kazuo Ohta: Foreword. IEICE Transactions 92-A(1): 1-2 (2009)

Takashi Nishide, Kazuki Yoneyama, Kazuo Ohta: Attribute-Based Encryption with Partially Hidden Ciphertext Policies. IEICE Transactions 92-A(1): 22-32 (2009)

Lei Wang, Kazuo Ohta, Noboru Kunihiro: Near-Collision Attacks on MD4: Applied to MD4-Based Protocols. IEICE Transactions 92-A(1): 76-86 (2009)

Jun Yajima, Terutoshi Iwasaki, Yusuke Naito, Yu Sasaki, Takeshi Shimoyama, Thomas Peyrin, Noboru Kunihiro, Kazuo Ohta: A Strict Evaluation on the Number of Conditions for SHA-1 Collision Search. IEICE Transactions 92-A(1): 87-95 (2009)

Yu Sasaki, Lei Wang, Kazuo Ohta, Noboru Kunihiro: Extended Password Recovery Attacks against APOP, SIP, and Digest Authentication. IEICE Transactions 92-A(1): 96-104 (2009)

Bagus Santoso, Kazuo Ohta: A New 'On the Fly' Identification Scheme: An Asymptoticity Trade-Off between ZK and Correctness. IEICE Transactions 92-A(1): 122-136 (2009)

Kazuki Yoneyama, Satoshi Miyagawa, Kazuo Ohta: Leaky Random Oracle. IEICE Transactions 92-A(8): 1795-1807 (2009)

Masami Izumi, Kazuo Sakiyama, Kazuo Ohta: A New Approach for Implementing the MPL Method toward Higher SPA Resistance. ARES 2009: 181-186

Tetsuya Izu, Noboru Kunihiro, Kazuo Ohta, Makoto Sano, Masahiko Takenaka: Yet Another Sanitizable Signature from Bilinear Maps. ARES 2009: 941-946

Yuichi Komano, Kazuo Ohta, Hideyuki Miyake, Atsushi Shimbo: Algorithmic Tamper Proof (ATP) Counter Units for Authentication Devices Using PIN. ACNS 2009: 306-323

Yusuke Naito, Kazuki Yoneyama, Lei Wang, Kazuo Ohta: How to Confirm Cryptosystems Security: The Original Merkle-Damgård Is Still Alive! ASIACRYPT 2009: 382-398

Kazuo Sakiyama, Tatsuya Yagi, Kazuo Ohta: Fault Analysis Attack against an AES Prototype Chip Using RSL. CT-RSA 2009: 429-443

Yang Li, Kazuo Sakiyama, Shin-ichi Kawamura, Yuichi Komano, Kazuo Ohta: Security Evaluation of a DPA-Resistant S-Box Based on the Fourier Transform. ICICS 2009: 3-16

Yutaka Kawai, Kazuki Yoneyama, Kazuo Ohta: Secret Handshake: Strong Anonymity Definition and Construction. ISPEC 2009: 219-229

Lei Wang, Yu Sasaki, Kazuo Sakiyama, Kazuo Ohta: Bit-Free Collision: Application to APOP Attack. IWSEC 2009: 3-21

Yusuke Naito, Kazuki Yoneyama, Lei Wang, Kazuo Ohta: How to Prove the Security of Practical Cryptosystems with Merkle-Damgård Hashing by Adopting Indifferentiability. IACR Cryptology ePrint Archive 2009: 40 (2009)

Yusuke Naito, Kazuki Yoneyama, Lei Wang, Kazuo Ohta: Security of Practical Cryptosystems Using Merkle-Damgard Hash Function in the Ideal Cipher Model. IACR Cryptology ePrint Archive 2009: 75 (2009)

Yutaka Kawai, Kazuki Yoneyama, Kazuo Ohta: Secret Handshake: Strong Anonymity Definition and Construction. IACR Cryptology ePrint Archive 2009: 148 (2009)

Yusuke Naito, Lei Wang, Kazuo Ohta: How to Construct Cryptosystems and Hash Functions in Weakened Random Oracle Models. IACR Cryptology ePrint Archive 2009: 550 (2009)

Yusuke Naito, Kazuo Ohta, Noboru Kunihiro: Improved Collision Search for Hash Functions: New Advanced Message Modification. IEICE Transactions 91-A(1): 46-54 (2008)

Yu Sasaki, Lei Wang, Noboru Kunihiro, Kazuo Ohta: New Message Differences for Collision Attacks on MD4 and MD5. IEICE Transactions 91-A(1): 55-63 (2008)

Yuichi Komano, Kazuo Ohta, Atsushi Shimbo, Shin-ichi Kawamura: Provably Secure Multisignatures in Formal Security Model and Their Optimality. IEICE Transactions 91-A(1): 107-118 (2008)

Bagus Santoso, Noboru Kunihiro, Naoki Kanayama, Kazuo Ohta: Factorization of Square-Free Integers with High Bits Known. IEICE Transactions 91-A(1): 306-315 (2008)

Takashi Nishide, Kazuki Yoneyama, Kazuo Ohta: Attribute-Based Encryption with Partially Hidden Encryptor-Specified Access Structures. ACNS 2008: 111-129

Yu Sasaki, Lei Wang, Kazuo Ohta, Noboru Kunihiro: Password Recovery on Challenge and Response: Impossible Differential Attack on Hash Function. AFRICACRYPT 2008: 290-307

Jun Yajima, Terutoshi Iwasaki, Yusuke Naito, Yu Sasaki, Takeshi Shimoyama, Noboru Kunihiro, Kazuo Ohta: A strict evaluation method on the number of conditions for the SHA-1 collision search. ASIACCS 2008: 10-20

Yu Sasaki, Lei Wang, Kazuo Ohta, Noboru Kunihiro: Security of MD5 Challenge and Response: Extension of APOP Password Recovery Attack. CT-RSA 2008: 1-18

Lei Wang, Kazuo Ohta, Noboru Kunihiro: New Key-Recovery Attacks on HMAC/NMAC-MD4 and NMAC-MD5. EUROCRYPT 2008: 237-253

Kazuki Yoneyama, Satoshi Miyagawa, Kazuo Ohta: Leaky Random Oracle (Extended Abstract). ProvSec 2008: 226-240

Tetsuya Izu, Noboru Kunihiro, Kazuo Ohta, Makoto Sano, Masahiko Takenaka: Sanitizable and Deletable Signature. WISA 2008: 130-144

Yutaka Kawai, Shotaro Tanno, Takahiro Kondo, Kazuki Yoneyama, Noboru Kunihiro, Kazuo Ohta: Extension of Secret Handshake Protocols with Multiple Groups in Monotone Condition. WISA 2008: 160-173

Yu Sasaki, Yusuke Naito, Noboru Kunihiro, Kazuo Ohta: Improved Collision Attacks on MD4 and MD5. IEICE Transactions 90-A(1): 36-47 (2007)

Yuichi Komano, Kazuo Ohta, Atsushi Shimbo, Shin-ichi Kawamura: Toward the Fair Anonymous Signatures: Deniable Ring Signatures. IEICE Transactions 90-A(1): 54-64 (2007)

Haruki Ota, Kazuki Yoneyama, Shinsaku Kiyomoto, Toshiaki Tanaka, Kazuo Ohta: Universally Composable Hierarchical Hybrid Authenticated Key Exchange. IEICE Transactions 90-A(1): 139-151 (2007)

Takashi Nishide, Kazuo Ohta: Constant-Round Multiparty Computation for Interval Test, Equality Test, and Comparison. IEICE Transactions 90-A(5): 960-968 (2007)

Yoshikazu Hanatani, Yuichi Komano, Kazuo Ohta, Noboru Kunihiro: Provably Secure Untraceable Electronic Cash against Insider Attacks. IEICE Transactions 90-A(5): 980-991 (2007)

Yasuhiro Takahashi, Noboru Kunihiro, Kazuo Ohta: The quantum fourier transform on a linear nearest neighbor architecture. Quantum Information & Computation 7(4): 383-391 (2007)

Kazuki Yoneyama, Haruki Ota, Kazuo Ohta: Secure Cross-Realm Client-to-Client Password-Based Authenticated Key Exchange Against Undetectable On-Line Dictionary Attacks. AAECC 2007: 257-266

Jun Yajima, Yu Sasaki, Yusuke Naito, Terutoshi Iwasaki, Takeshi Shimoyama, Noboru Kunihiro, Kazuo Ohta: A New Strategy for Finding a Differential Path of SHA-1. ACISP 2007: 45-58

Kazuki Yoneyama, Kazuo Ohta: Ring signatures: universally composable definitions and constructions. ASIACCS 2007: 374-376

Yu Sasaki, Lei Wang, Kazuo Ohta, Noboru Kunihiro: New Message Difference for MD4. FSE 2007: 329-348

Masayuki Terada, Kazuki Yoneyama, Sadayuki Hongo, Kazuo Ohta: Modeling Agreement Problems in the Universal Composability Framework. ICICS 2007: 350-361

Tetsuya Izu, Noboru Kunihiro, Kazuo Ohta, Masahiko Takenaka, Takashi Yoshioka: A Sanitizable Signature Scheme with Aggregation. ISPEC 2007: 51-64

Takashi Nishide, Kazuo Ohta: Multiparty Computation for Interval, Equality, and Comparison Without Bit-Decomposition Protocol. Public Key Cryptography 2007: 343-360

Yuichi Komano, Kazuo Ohta: Taxonomical Security Consideration of OAEP Variants. IEICE Transactions 89-A(5): 1233-1245 (2006)

Mitsugu Iwamoto, Lei Wang, Kazuki Yoneyama, Noboru Kunihiro, Kazuo Ohta: Visual Secret Sharing Schemes for Multiple Secret Images Allowing the Rotation of Shares. IEICE Transactions 89-A(5): 1382-1395 (2006)

Noboru Kunihiro, Wataru Abe, Kazuo Ohta: Maurer-Yacobi ID-Based Key Distribution Revisited. IEICE Transactions 89-A(5): 1421-1424 (2006)

Manabu Watanabe, Masanobu Shimada, Ake Rosenqvist, Takeo Tadono, Masayuki Matsuoka, Shakil Ahmad Romshoo, Kazuo Ohta, Ryoichi Furuta, Kazuki Nakamura, Toshifumi Moriyama: Forest Structure Dependency of the Relation Between L-Band Sigma ⁰ and Biophysical Parameters. IEEE T. Geoscience and Remote Sensing 44(11-1): 3154-3165 (2006)

Yusuke Naito, Yu Sasaki, Takeshi Shimoyama, Jun Yajima, Noboru Kunihiro, Kazuo Ohta: Improved Collision Search for SHA-0. ASIACRYPT 2006: 21-36

Masahiro Mambo, Moises Rosales Salinas, Kazuo Ohta, Noboru Kunihiro: Problems on the MR micropayment schemes. ASIACCS 2006: 363

Yuichi Komano, Kazuo Ohta, Atsushi Shimbo, Shin-ichi Kawamura: Toward the Fair Anonymous Signatures: Deniable Ring Signatures. CT-RSA 2006: 174-191

Yoshikazu Hanatani, Yuichi Komano, Kazuo Ohta, Noboru Kunihiro: Provably Secure Electronic Cash Based on Blind Multisignature Schemes. Financial Cryptography 2006: 236-250

Yuichi Komano, Kazuo Ohta, Atsushi Shimbo, Shin-ichi Kawamura: Formal Security Model of Multisignatures. ISC 2006: 146-160

Bagus Santoso, Noboru Kunihiro, Naoki Kanayama, Kazuo Ohta: Factorization of Square-Free Integers with High Bits Known. VIETCRYPT 2006: 115-130

Yu Sasaki, Yusuke Naito, Jun Yajima, Takeshi Shimoyama, Noboru Kunihiro, Kazuo Ohta: How to Construct Sufficient Conditions for Hash Functions. VIETCRYPT 2006: 243-259

Yusuke Naito, Yu Sasaki, Takeshi Shimoyama, Jun Yajima, Noboru Kunihiro, Kazuo Ohta: Message Modification for Step 21-23 on SHA-0. IACR Cryptology ePrint Archive 2006: 16 (2006)

Yu Sasaki, Yusuke Naito, Jun Yajima, Takeshi Shimoyama, Noboru Kunihiro, Kazuo Ohta: How to Construct Sufficient Condition in Searching Collisions of MD5. IACR Cryptology ePrint Archive 2006: 74 (2006)

Norio Adachi, Satoshi Aoki, Yuichi Komano, Kazuo Ohta: Solutions to Security Problems of Rivest and Shamir's PayWord Scheme. IEICE Transactions 88-A(1): 195-202 (2005)

Yusuke Naito, Yu Sasaki, Noboru Kunihiro, Kazuo Ohta: Improved Collision Attack on MD4 with Probability Almost 1. ICISC 2005: 129-145

Yuichi Komano, Kazuo Ohta, Atsushi Shimbo, Shin-ichi Kawamura: On the Security of Probabilistic Multisignature Schemes and Their Optimality. Mycrypt 2005: 132-150

Tetsuya Izu, Noboru Kunihiro, Kazuo Ohta, Takeshi Shimoyama: Analysis on the Clockwise Transposition Routing for Dedicated Factoring Devices. WISA 2005: 232-242

Yusuke Naito, Yu Sasaki, Noboru Kunihiro, Kazuo Ohta: Improved Collision Attack on MD4. IACR Cryptology ePrint Archive 2005: 151 (2005)

Yu Sasaki, Yusuke Naito, Noboru Kunihiro, Kazuo Ohta: Improved Collision Attack on MD5. IACR Cryptology ePrint Archive 2005: 400 (2005)

Yuichi Komano, Kazuo Ohta: OAEP-ES - Methodology of Universal Padding Technique. IEICE Transactions 87-A(1): 110-119 (2004)

Yuichi Komano, Kazuo Ohta: Taxonomic Consideration to OAEP Variants and Their Security. ICICS 2004: 105-117

Yuichi Komano, Kazuo Ohta: Efficient Universal Padding Schemes for Multiplicative Trapdoor One-way Permutation. IACR Cryptology ePrint Archive 2004: 2 (2004)

Kazuo Ohta, Tetsuo Nishino, Seiya Okubo, Noboru Kunihiro: A Quantum Algorithm Using NMR Computers to Break Secret-Key Cryptosystems. New Generation Comput. 21(4): 347-361 (2003)

Yuichi Komano, Kazuo Ohta: Efficient Universal Padding Techniques for Multiplicative Trapdoor One-Way Permutation. CRYPTO 2003: 366-382

Norio Adachi, Yuichi Komano, Satoshi Aoki, Kazuo Ohta: The Security Problems of Rivest and Shamir's PayWord Scheme. CEC 2003: 20-23

Silvio Micali, Kazuo Ohta, Leonid Reyzin: Accountable-subgroup multisignatures: extended abstract. ACM Conference on Computer and Communications Security 2001: 245-254

Kazuo Ohta, Tatsuaki Okamoto: On Concrete Security Treatment of Signatures Derived from Identification. CRYPTO 1998: 354-369

Masayuki Kanda, Youichi Takashima, Tsutomu Matsumoto, Kazumaro Aoki, Kazuo Ohta: A Strategy for Constructing Fast Round Functions with Practical Security Against Differential and Linear Cryptanalysis. Selected Areas in Cryptography 1998: 264-279

Kazuo Ohta, Dingyi Pei (Eds.): Advances in Cryptology - ASIACRYPT '98, International Conference on the Theory and Applications of Cryptology and Information Security, Beijing, China, October 18-22, 1998, Proceedings. Lecture Notes in Computer Science 1514, Springer 1998, isbn 3-540-65109-8

Yasuyoshi Kaneko, Shiho Moriai, Kazuo Ohta: On strict estimation method of provable security against differential and linear cryptanalysis. ICICS 1997: 258-268

Kazuo Ohta: Remarks on Blind Decryption. ISW 1997: 109-115

Kazuo Ohta, Shiho Moriai, Kazumaro Aoki: Improving the Search Algorithm for the Best Linear Expression. CRYPTO 1995: 157-170

Tatsuaki Okamoto, Kazuo Ohta: How to Simultaneously Exchange Secrets by General Assumptions. ACM Conference on Computer and Communications Security 1994: 184-192

Kazuo Ohta, Kazumaro Aoki: Linear Cryptanalysis of the Fast Data Encipherment Algorithm. CRYPTO 1994: 12-16

Kazuo Ohta, Mitsuru Matsui: Differential Attack on Message Authentication Codes. CRYPTO 1993: 200-211

Atsushi Fujioka, Tatsuaki Okamoto, Kazuo Ohta: A Practical Secret Voting Scheme for Large Scale Elections. AUSCRYPT 1992: 244-251

Kazuo Ohta, Tatsuaki Okamoto, Atsushi Fujioka: Secure Bit Commitment Function against Divertibility. EUROCRYPT 1992: 324-340

Kazuo Ohta, Tatsuaki Okamoto: A Digital Multisignature Scheme Based on the Fiat-Shamir Scheme. ASIACRYPT 1991: 139-148

Hikaru Morita, Kazuo Ohta, Shoji Miyaguchi: Results of Switching-Closure-Test on FEAL (Extended Abstract). ASIACRYPT 1991: 247-252

Hikaru Morita, Kazuo Ohta, Shoji Miyaguchi: A Switching Closure Test to Analyze Cryptosystems. CRYPTO 1991: 183-193

Tatsuaki Okamoto, Kazuo Ohta: Universal Electronic Cash. CRYPTO 1991: 324-337

Tatsuaki Okamoto, David Chaum, Kazuo Ohta: Direct Zero Knowledge Proofs of Computational Power in Five Rounds. EUROCRYPT 1991: 96-105

Atsushi Fujioka, Tatsuaki Okamoto, Kazuo Ohta: Interactive Bi-Proof Systems and Undeniable Signature Schemes. EUROCRYPT 1991: 243-256

Kazuo Ohta, Kenji Koyama: Meet-in-the-Middle Attack on Digital Signature Schemes. AUSCRYPT 1990: 140-154

Tatsuaki Okamoto, Kazuo Ohta: How to Utilize the Randomness of Zero-Knowledge Proofs. CRYPTO 1990: 456-475

Shoji Miyaguchi, Kazuo Ohta, Masahiko Iwata: Confirmation that Some Hash Functions Are Not Collision Free. EUROCRYPT 1990: 326-343

Kazuo Ohta, Tatsuaki Okamoto, Kenji Koyama: Membership Authentication for Hierarchical Multigroups Using the Extended Fiat-Shamir Scheme. EUROCRYPT 1990: 446-457

Tatsuaki Okamoto, Kazuo Ohta: Disposable Zero-Knowledge Authentications and Their Applications to Untraceable Electronic Cash. CRYPTO 1989: 481-496

Tatsuaki Okamoto, Kazuo Ohta: Divertible Zero Knowledge Interactive Proofs and Commutative Random Self-Reducibility. EUROCRYPT 1989: 134-148

Kazuo Ohta, Tatsuaki Okamoto: A Modification of the Fiat-Shamir Scheme. CRYPTO 1988: 232-243

Kenji Koyama, Kazuo Ohta: Security of Improved Identity-Based Conference Key Distribution Systems. EUROCRYPT 1988: 11-19

Kenji Koyama, Kazuo Ohta: Identity-based Conference Key Distribution Systems. CRYPTO 1987: 175-184