A Modification of the Fiat-Shamir Scheme. - Kazuo Ohta; Tatsuaki Okamoto (CRYPTO, 1988)

Security of Improved Identity-Based Conference Key Distribution Systems. - Kenji Koyama; Kazuo Ohta (EUROCRYPT, 1988)

Disposable Zero-Knowledge Authentications and Their Applications to Untraceable Electronic Cash. - Tatsuaki Okamoto; Kazuo Ohta (CRYPTO, 1989)

Divertible Zero Knowledge Interactive Proofs and Commutative Random Self-Reducibility. - Tatsuaki Okamoto; Kazuo Ohta (EUROCRYPT, 1989)

Meet-in-the-Middle Attack on Digital Signature Schemes. - Kazuo Ohta; Kenji Koyama (AUSCRYPT, 1990)

How to Utilize the Randomness of Zero-Knowledge Proofs. - Tatsuaki Okamoto; Kazuo Ohta (CRYPTO, 1990)

Confirmation that Some Hash Functions Are Not Collision Free. - Shoji Miyaguchi; Kazuo Ohta; Masahiko Iwata (EUROCRYPT, 1990)

Membership Authentication for Hierarchical Multigroups Using the Extended Fiat-Shamir Scheme. - Kazuo Ohta; Tatsuaki Okamoto; Kenji Koyama (EUROCRYPT, 1990)

Identity-based conference key distribution systems. - Kenji Koyama; Kazuo Ohta (Syst. Comput. Jpn., 1990)

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

A Digital Multisignature Scheme Based on the Fiat-Shamir Scheme. - Kazuo Ohta; Tatsuaki Okamoto (ASIACRYPT, 1991)

A Switching Closure Test to Analyze Cryptosystems. - Hikaru Morita; Kazuo Ohta; Shoji Miyaguchi (CRYPTO, 1991)

Universal Electronic Cash. - Tatsuaki Okamoto; Kazuo Ohta (CRYPTO, 1991)

Interactive Bi-Proof Systems and Undeniable Signature Schemes. - Atsushi Fujioka; Tatsuaki Okamoto; Kazuo Ohta (EUROCRYPT, 1991)

Direct Zero Knowledge Proofs of Computational Power in Five Rounds. - Tatsuaki Okamoto; David Chaum; Kazuo Ohta (EUROCRYPT, 1991)

A Practical Secret Voting Scheme for Large Scale Elections. - Atsushi Fujioka; Tatsuaki Okamoto; Kazuo Ohta (AUSCRYPT, 1992)

Secure Bit Commitment Function against Divertibility. - Kazuo Ohta; Tatsuaki Okamoto; Atsushi Fujioka (EUROCRYPT, 1992)

Differential Attack on Message Authentication Codes. - Kazuo Ohta; Mitsuru Matsui (CRYPTO, 1993)

How to Simultaneously Exchange Secrets by General Assumptions. - Tatsuaki Okamoto; Kazuo Ohta (CCS, 1994)

Linear Cryptanalysis of the Fast Data Encipherment Algorithm. - Kazuo Ohta; Kazumaro Aoki (CRYPTO, 1994)

Improving the Search Algorithm for the Best Linear Expression. - Kazuo Ohta; Shiho Moriai; Kazumaro Aoki (CRYPTO, 1995)

On strict estimation method of provable security against differential and linear cryptanalysis. - Yasuyoshi Kaneko; Shiho Moriai; Kazuo Ohta (ICICS, 1997)

Remarks on Blind Decryption. - Kazuo Ohta (ISW, 1997)

On Concrete Security Treatment of Signatures Derived from Identification. - Kazuo Ohta; Tatsuaki Okamoto (CRYPTO, 1998)

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

Accountable-subgroup multisignatures: extended abstract. - Silvio Micali; Kazuo Ohta; Leonid Reyzin (CCS, 2001)

Efficient Universal Padding Techniques for Multiplicative Trapdoor One-Way Permutation. - Yuichi Komano; Kazuo Ohta (CRYPTO, 2003)

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

A Quantum Algorithm Using NMR Computers to Break Secret-Key Cryptosystems. - Kazuo Ohta; Tetsuo Nishino; Seiya Okubo; Noboru Kunihiro (New Gener. Comput., 2003)

Taxonomic Consideration to OAEP Variants and Their Security. - Yuichi Komano; Kazuo Ohta (ICICS, 2004)

Tight correlations between forest parameters and backscattering coefficient derived by the L-band airborne SAR (PiSAR). - Manabu Watanabe; Masanobu Shimada; Ake Rosenqvist; Shakil Ahmad Romshoo; Kazuo Ohta; Takeo Tadono; Masayuki Matsuoka; Ryoichi Furuta (IGARSS, 2004)

Efficient Universal Padding Schemes for Multiplicative Trapdoor One-way Permutation. - Yuichi Komano; Kazuo Ohta (IACR Cryptol. ePrint Arch., 2004)

OAEP-ES - Methodology of Universal Padding Technique. - Yuichi Komano; Kazuo Ohta (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2004)

Improved Collision Attack on MD4 with Probability Almost 1. - Yusuke Naito 001; Yu Sasaki; Noboru Kunihiro; Kazuo Ohta (ICISC, 2005)

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

Analysis on the Clockwise Transposition Routing for Dedicated Factoring Devices. - Tetsuya Izu; Noboru Kunihiro; Kazuo Ohta; Takeshi Shimoyama (WISA, 2005)

Improved Collision Attack on MD4. - Yusuke Naito 001; Yu Sasaki; Noboru Kunihiro; Kazuo Ohta (IACR Cryptol. ePrint Arch., 2005)

Improved Collision Attack on MD5. - Yu Sasaki; Yusuke Naito 001; Noboru Kunihiro; Kazuo Ohta (IACR Cryptol. ePrint Arch., 2005)

Solutions to Security Problems of Rivest and Shamir's PayWord Scheme. - Norio Adachi; Satoshi Aoki; Yuichi Komano; Kazuo Ohta (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2005)

Improved Collision Search for SHA-0. - Yusuke Naito 001; Yu Sasaki; Takeshi Shimoyama; Jun Yajima; Noboru Kunihiro; Kazuo Ohta (ASIACRYPT, 2006)

Problems on the MR micropayment schemes. - Masahiro Mambo; Moisés Salinas-Rosales; Kazuo Ohta; Noboru Kunihiro (AsiaCCS, 2006)

Provably Secure Electronic Cash Based on Blind Multisignature Schemes. - Yoshikazu Hanatani; Yuichi Komano; Kazuo Ohta; Noboru Kunihiro (Financial Cryptography, 2006)

Formal Security Model of Multisignatures. - Yuichi Komano; Kazuo Ohta; Atsushi Shimbo; Shin-ichi Kawamura (ISC, 2006)

How to Construct Sufficient Conditions for Hash Functions. - Yu Sasaki; Yusuke Naito 001; Jun Yajima; Takeshi Shimoyama; Noboru Kunihiro; Kazuo Ohta (VIETCRYPT, 2006)

Message Modification for Step 21-23 on SHA-0. - Yusuke Naito 001; Yu Sasaki; Takeshi Shimoyama; Jun Yajima; Noboru Kunihiro; Kazuo Ohta (IACR Cryptol. ePrint Arch., 2006)

How to Construct Sufficient Condition in Searching Collisions of MD5. - Yu Sasaki; Yusuke Naito 001; Jun Yajima; Takeshi Shimoyama; Noboru Kunihiro; Kazuo Ohta (IACR Cryptol. ePrint Arch., 2006)

Visual Secret Sharing Schemes for Multiple Secret Images Allowing the Rotation of Shares. - Mitsugu Iwamoto; Lei Wang 031; Kazuki Yoneyama; Noboru Kunihiro; Kazuo Ohta (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2006)

Taxonomical Security Consideration of OAEP Variants. - Yuichi Komano; Kazuo Ohta (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2006)

Maurer-Yacobi ID-Based Key Distribution Revisited. - Noboru Kunihiro; Wataru Abe; Kazuo Ohta (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2006)

Forest Structure Dependency of the Relation Between L-Band Sigma 0 and Biophysical Parameters. - Manabu Watanabe; Masanobu Shimada; Ake Rosenqvist; Takeo Tadono; Masayuki Matsuoka; Shakil Ahmad Romshoo; Kazuo Ohta; Ryoichi Furuta; Kazuki Nakamura; Toshifumi Moriyama (IEEE Trans. Geosci. Remote. Sens., 2006)

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

A New Strategy for Finding a Differential Path of SHA-1. - Jun Yajima; Yu Sasaki; Yusuke Naito 001; Terutoshi Iwasaki; Takeshi Shimoyama; Noboru Kunihiro; Kazuo Ohta (ACISP, 2007)

New Message Difference for MD4. - Yu Sasaki; Lei Wang 031; Kazuo Ohta; Noboru Kunihiro (FSE, 2007)

Modeling Agreement Problems in the Universal Composability Framework. - Masayuki Terada; Kazuki Yoneyama; Sadayuki Hongo; Kazuo Ohta (ICICS, 2007)

A Sanitizable Signature Scheme with Aggregation. - Tetsuya Izu; Noboru Kunihiro; Kazuo Ohta; Masahiko Takenaka; Takashi Yoshioka (ISPEC, 2007)

Multiparty Computation for Interval, Equality, and Comparison Without Bit-Decomposition Protocol. - Takashi Nishide; Kazuo Ohta (Public Key Cryptography, 2007)

Provably Secure Untraceable Electronic Cash against Insider Attacks. - Yoshikazu Hanatani; Yuichi Komano; Kazuo Ohta; Noboru Kunihiro (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2007)

Toward the Fair Anonymous Signatures: Deniable Ring Signatures. - Yuichi Komano; Kazuo Ohta; Atsushi Shimbo; Shin-ichi Kawamura (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2007)

Constant-Round Multiparty Computation for Interval Test, Equality Test, and Comparison. - Takashi Nishide; Kazuo Ohta (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2007)

Universally Composable Hierarchical Hybrid Authenticated Key Exchange. - Haruki Ota; Kazuki Yoneyama; Shinsaku Kiyomoto; Toshiaki Tanaka; Kazuo Ohta (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2007)

Improved Collision Attacks on MD4 and MD5. - Yu Sasaki; Yusuke Naito 001; Noboru Kunihiro; Kazuo Ohta (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2007)

Universally Composable Client-to-Client General Authenticated Key Exchange. - Haruki Ota; Kazuki Yoneyama; Shinsaku Kiyomoto; Toshiaki Tanaka; Kazuo Ohta (Inf. Media Technol., 2007)

Ring Signatures: Universally Composable Definitions and Constructions. - Kazuki Yoneyama; Kazuo Ohta (Inf. Media Technol., 2007)

The quantum fourier transform on a linear nearest neighbor architecture. - Yasuhiro Takahashi; Noboru Kunihiro; Kazuo Ohta (Quantum Inf. Comput., 2007)

Attribute-Based Encryption with Partially Hidden Encryptor-Specified Access Structures. - Takashi Nishide; Kazuki Yoneyama; Kazuo Ohta (ACNS, 2008)

Password Recovery on Challenge and Response: Impossible Differential Attack on Hash Function. - Yu Sasaki; Lei Wang 031; Kazuo Ohta; Noboru Kunihiro (AFRICACRYPT, 2008)

A strict evaluation method on the number of conditions for the SHA-1 collision search. - Jun Yajima; Terutoshi Iwasaki; Yusuke Naito 001; Yu Sasaki; Takeshi Shimoyama; Noboru Kunihiro; Kazuo Ohta (AsiaCCS, 2008)

Security of MD5 Challenge and Response: Extension of APOP Password Recovery Attack. - Yu Sasaki; Lei Wang 031; Kazuo Ohta; Noboru Kunihiro (CT-RSA, 2008)

New Key-Recovery Attacks on HMAC/NMAC-MD4 and NMAC-MD5. - Lei Wang 031; Kazuo Ohta; Noboru Kunihiro (EUROCRYPT, 2008)

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

Sanitizable and Deletable Signature. - Tetsuya Izu; Noboru Kunihiro; Kazuo Ohta; Makoto Sano; Masahiko Takenaka (WISA, 2008)

Provably Secure Multisignatures in Formal Security Model and Their Optimality. - Yuichi Komano; Kazuo Ohta; Atsushi Shimbo; Shin-ichi Kawamura (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2008)

Improved Collision Search for Hash Functions: New Advanced Message Modification. - Yusuke Naito 001; Kazuo Ohta; Noboru Kunihiro (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2008)

Factorization of Square-Free Integers with High Bits Known. - Bagus Santoso; Noboru Kunihiro; Naoki Kanayama; Kazuo Ohta (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2008)

New Message Differences for Collision Attacks on MD4 and MD5. - Yu Sasaki; Lei Wang 031; Noboru Kunihiro; Kazuo Ohta (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2008)

Yet Another Sanitizable Signature from Bilinear Maps. - Tetsuya Izu; Noboru Kunihiro; Kazuo Ohta; Makoto Sano; Masahiko Takenaka (ARES, 2009)

A New Approach for Implementing the MPL Method toward Higher SPA Resistance. - Masami Izumi; Kazuo Sakiyama; Kazuo Ohta (ARES, 2009)

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

How to Confirm Cryptosystems Security: The Original Merkle-Damgård Is Still Alive! - Yusuke Naito 001; Kazuki Yoneyama; Lei Wang 031; Kazuo Ohta (ASIACRYPT, 2009)

Fault Analysis Attack against an AES Prototype Chip Using RSL. - Kazuo Sakiyama; Tatsuya Yagi; Kazuo Ohta (CT-RSA, 2009)

Security Evaluation of a DPA-Resistant S-Box Based on the Fourier Transform. - Yang Li 001; Kazuo Sakiyama; Shin-ichi Kawamura; Yuichi Komano; Kazuo Ohta (ICICS, 2009)

Bit-Free Collision: Application to APOP Attack. - Lei Wang 031; Yu Sasaki; Kazuo Sakiyama; Kazuo Ohta (IWSEC, 2009)

Secret Handshake: Strong Anonymity Definition and Construction. - Yutaka Kawai; Kazuki Yoneyama; Kazuo Ohta (IACR Cryptol. ePrint Arch., 2009)

How to Construct Cryptosystems and Hash Functions in Weakened Random Oracle Models. - Yusuke Naito 001; Lei Wang 031; Kazuo Ohta (IACR Cryptol. ePrint Arch., 2009)

How to Prove the Security of Practical Cryptosystems with Merkle-Damgård Hashing by Adopting Indifferentiability. - Yusuke Naito 001; Kazuki Yoneyama; Lei Wang 031; Kazuo Ohta (IACR Cryptol. ePrint Arch., 2009)

Security of Practical Cryptosystems Using Merkle-Damgard Hash Function in the Ideal Cipher Model. - Yusuke Naito 001; Kazuki Yoneyama; Lei Wang 031; Kazuo Ohta (IACR Cryptol. ePrint Arch., 2009)

Attribute-Based Encryption with Partially Hidden Ciphertext Policies. - Takashi Nishide; Kazuki Yoneyama; Kazuo Ohta (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2009)

Foreword. - Kazuo Ohta (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2009)

A New 'On the Fly' Identification Scheme: An Asymptoticity Trade-Off between ZK and Correctness. - Bagus Santoso; Kazuo Ohta (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2009)

Extended Password Recovery Attacks against APOP, SIP, and Digest Authentication. - Yu Sasaki; Lei Wang 031; Kazuo Ohta; Noboru Kunihiro (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2009)

Near-Collision Attacks on MD4: Applied to MD4-Based Protocols. - Lei Wang 031; Kazuo Ohta; Noboru Kunihiro (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2009)

A Strict Evaluation on the Number of Conditions for SHA-1 Collision Search. - Jun Yajima; Terutoshi Iwasaki; Yusuke Naito 001; Yu Sasaki; Takeshi Shimoyama; Thomas Peyrin; Noboru Kunihiro; Kazuo Ohta (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2009)

Leaky Random Oracle. - Kazuki Yoneyama; Satoshi Miyagawa; Kazuo Ohta (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2009)

Multiple Designated Verifiers Signatures Reconsidered. - Mebae Ushida; Tetsuya Izu; Masahiko Takenaka; Kazuo Ohta (ARES, 2010)

Non-full-active Super-Sbox Analysis: Applications to ECHO and Grøstl. - Yu Sasaki; Yang Li 001; Lei Wang 031; Kazuo Sakiyama; Kazuo Ohta (ASIACRYPT, 2010)

Fault Sensitivity Analysis. - Yang Li 001; Kazuo Sakiyama; Shigeto Gomisawa; Toshinori Fukunaga; Junko Takahashi; Kazuo Ohta (CHES, 2010)

Rigorous Security Requirements for Designated Verifier Signatures. - Kazuki Yoneyama; Mebae Ushida; Kazuo Ohta (Inscrypt, 2010)

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

Improved countermeasure against Address-bit DPA for ECC scalar multiplication. - Masami Izumi; Jun Ikegami; Kazuo Sakiyama; Kazuo Ohta (DATE, 2010)

Power Variance Analysis breaks a masked ASIC implementation of AES. - Yang Li 001; Kazuo Sakiyama; Lejla Batina; Daisuke Nakatsu; Kazuo Ohta (DATE, 2010)

Prototyping Platform for Performance Evaluation of SHA-3 Candidates. - 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; et al. (HOST, 2010)

A Generic Method for Reducing Ciphertext Length of Reproducible KEMs in the RO Model. - Yusuke Sakai 001; Goichiro Hanaoka; Kaoru Kurosawa; Kazuo Ohta (IWSEC, 2010)

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

Combination of SW Countermeasure and CPU Modification on FPGA against Power Analysis. - Daisuke Nakatsu; Yang Li 001; Kazuo Sakiyama; Kazuo Ohta (WISA, 2010)

Efficient Differential Fault Analysis for AES. - Shigeto Gomisawa; Yang Li 001; Junko Takahashi; Toshinori Fukunaga; Yu Sasaki; Kazuo Sakiyama; Kazuo Ohta (IACR Cryptol. ePrint Arch., 2010)

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

An Information Theoretic Perspective on the Differential Fault Analysis against AES. - Yang Li 001; Shigeto Gomisawa; Kazuo Sakiyama; Kazuo Ohta (IACR Cryptol. ePrint Arch., 2010)

Robust RFID Authentication Protocol with Formal Proof and Its Feasibility. - Miyako Ohkubo; Shin'ichiro Matsuo; Yoshikazu Hanatani; Kazuo Sakiyama; Kazuo Ohta (IACR Cryptol. ePrint Arch., 2010)

Extension of Secret Handshake Protocols with Multiple Groups in Monotone Condition. - Yutaka Kawai; Shotaro Tanno; Takahiro Kondo; Kazuki Yoneyama; Kazuo Ohta; Noboru Kunihiro (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2010)

On Clock-Based Fault Analysis Attack for an AES Hardware Using RSL. - Kazuo Sakiyama; Kazuo Ohta (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2010)

Practical Password Recovery Attacks on MD4 Based Prefix and Hybrid Authentication Protocols. - Yu Sasaki; Lei Wang 031; Kazuo Ohta; Kazumaro Aoki; Noboru Kunihiro (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2010)

Cryptanalysis of Two MD5-Based Authentication Protocols: APOP and NMAC. - Lei Wang 031; Kazuo Ohta; Yu Sasaki; Kazuo Sakiyama; Noboru Kunihiro (IEICE Trans. Inf. Syst., 2010)

Yet Another Sanitizable and Deletable Signatures. - Tetsuya Izu; Masami Izumi; Noboru Kunihiro; Kazuo Ohta (AINA Workshops, 2011)

On the Power of Fault Sensitivity Analysis and Collision Side-Channel Attacks in a Combined Setting. - Amir Moradi 001; Oliver Mischke; Christof Paar; Yang Li 001; Kazuo Ohta; Kazuo Sakiyama (CHES, 2011)

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

(Second) Preimage Attacks on Step-Reduced RIPEMD/RIPEMD-128 with a New Local-Collision Approach. - Lei Wang 031; Yu Sasaki; Wataru Komatsubara; Kazuo Ohta; Kazuo Sakiyama (CT-RSA, 2011)

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

Fault Sensitivity Analysis Against Elliptic Curve Cryptosystems. - Hikaru Sakamoto; Yang Li 001; Kazuo Ohta; Kazuo Sakiyama (FDTC, 2011)

Revisit fault sensitivity analysis on WDDL-AES. - Yang Li 001; Kazuo Ohta; Kazuo Sakiyama (HOST, 2011)

Ciphertext-Policy Delegatable Hidden Vector Encryption and Its Application to Searchable Encryption in Multi-user Setting. - Mitsuhiro Hattori; Takato Hirano; Takashi Ito; Nori Matsuda; Takumi Mori; Yusuke Sakai 001; Kazuo Ohta (IMACC, 2011)

Security notions for information theoretically secure encryptions. - Mitsugu Iwamoto; Kazuo Ohta (ISIT, 2011)

Experimental Verification of Super-Sbox Analysis - Confirmation of Detailed Attack Complexity. - Yu Sasaki; Naoyuki Takayanagi; Kazuo Sakiyama; Kazuo Ohta (IWSEC, 2011)

Clockwise Collision Analysis - Overlooked Side-Channel Leakage Inside Your Measurements. - Yang Li 001; Daisuke Nakatsu; Qi Li; Kazuo Ohta; Kazuo Sakiyama (IACR Cryptol. ePrint Arch., 2011)

Power Analysis against a DPA-Resistant S-Box Implementation Based on the Fourier Transform. - Yang Li 001; Kazuo Sakiyama; Shin-ichi Kawamura; Kazuo Ohta (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2011)

Security of Cryptosystems Using Merkle-Damgård in the Random Oracle Model. - Yusuke Naito 001; Kazuki Yoneyama; Lei Wang 031; Kazuo Ohta (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2011)

How to Shorten a Ciphertext of Reproducible Key Encapsulation Mechanisms in the Random Oracle Model. - Yusuke Sakai 001; Goichiro Hanaoka; Kaoru Kurosawa; Kazuo Ohta (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2011)

Ultra-Wideband Array Antenna Utilizing Novel Scanning System with Tapped Delay Lines for Short Range Radar. - Fuminori Sakai; Kazuo Ohta; Kunio Sawaya (IEICE Trans. Commun., 2011)

An Efficient Authentication for Lightweight Devices by Perfecting Zero-Knowledgeness. - Bagus Santoso; Kazuo Ohta; Kazuo Sakiyama; Goichiro Hanaoka (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2011)

Universally Composable NBAC-Based Fair Voucher Exchange for Mobile Environments. - Kazuki Yoneyama; Masayuki Terada; Sadayuki Hongo; Kazuo Ohta (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2011)

Proxiable Designated Verifier Signature. - Mebae Ushida; Yutaka Kawai; Kazuki Yoneyama; Kazuo Ohta (J. Inf. Process., 2011)

Three-Subset Meet-in-the-Middle Attack on Reduced XTEA. - Yu Sasaki; Lei Wang 031; Yasuhide Sakai; Kazuo Sakiyama; Kazuo Ohta (AFRICACRYPT, 2012)

An Extension of Fault Sensitivity Analysis Based on Clockwise Collision. - Yang Li 001; Kazuo Ohta; Kazuo Sakiyama (Inscrypt, 2012)

An Efficient Countermeasure against Fault Sensitivity Analysis Using Configurable Delay Blocks. - Sho Endo; Yang Li 001; Naofumi Homma; Kazuo Sakiyama; Kazuo Ohta; Takafumi Aoki (FDTC, 2012)

Key-Dependent Weakness of AES-Based Ciphers under Clockwise Collision Distinguisher. - Toshiki Nakasone; Yang Li 001; Yu Sasaki; Mitsugu Iwamoto; Kazuo Ohta; Kazuo Sakiyama (ICISC, 2012)

New Truncated Differential Cryptanalysis on 3D Block Cipher. - Takuma Koyama; Lei Wang 031; Yu Sasaki; Kazuo Sakiyama; Kazuo Ohta (ISPEC, 2012)

Polynomial-Advantage Cryptanalysis of 3D Cipher and 3D-Based Hash Function. - Lei Wang 031; Yu Sasaki; Kazuo Sakiyama; Kazuo Ohta (IWSEC, 2012)

Boomerang Distinguishers for Full HAS-160 Compression Function. - Yu Sasaki; Lei Wang 031; Yasuhiro Takasaki; Kazuo Sakiyama; Kazuo Ohta (IWSEC, 2012)

On the Security of Dynamic Group Signatures: Preventing Signature Hijacking. - Yusuke Sakai 001; Jacob C. N. Schuldt; Keita Emura; Goichiro Hanaoka; Kazuo Ohta (IACR Cryptol. ePrint Arch., 2012)

Toward Effective Countermeasures against an Improved Fault Sensitivity Analysis. - Yang Li 001; Kazuo Ohta; Kazuo Sakiyama (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2012)

Meet-in-the-Middle (Second) Preimage Attacks on Two Double-Branch Hash Functions RIPEMD and RIPEMD-128. - Lei Wang 031; Yu Sasaki; Wataru Komatsubara; Kazuo Sakiyama; Kazuo Ohta (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2012)

New Fault-Based Side-Channel Attack Using Fault Sensitivity. - Yang Li 001; Kazuo Ohta; Kazuo Sakiyama (IEEE Trans. Inf. Forensics Secur., 2012)

Information-Theoretic Approach to Optimal Differential Fault Analysis. - Kazuo Sakiyama; Yang Li 001; Mitsugu Iwamoto; Kazuo Ohta (IEEE Trans. Inf. Forensics Secur., 2012)

Fair and Consistent Hardware Evaluation of Fourteen Round Two SHA-3 Candidates. - Miroslav Knezevic; Kazuyuki Kobayashi; Jun Ikegami; Shin'ichiro Matsuo; Akashi Satoh; Ünal Koçabas; Junfeng Fan; Toshihiro Katashita; Takeshi Sugawara 001; Kazuo Sakiyama; Ingrid Verbauwhede; Kazuo Ohta; et al. (IEEE Trans. Very Large Scale Integr. Syst., 2012)

Fault Injection and Key Retrieval Experiments on an Evaluation Board. - Junko Takahashi; Toshinori Fukunaga; Shigeto Gomisawa; Yang Li 001; Kazuo Sakiyama; Kazuo Ohta (Fault Analysis in Cryptography, 2012)

Exploring the Relations between Fault Sensitivity and Power Consumption. - Yang Li 001; Sho Endo; Nicolas Debande; Naofumi Homma; Takafumi Aoki; Thanh-Ha Le; Jean-Luc Danger; Kazuo Ohta; Kazuo Sakiyama (COSADE, 2013)

Yet Another Fault-Based Leakage in Non-uniform Faulty Ciphertexts. - Yang Li 001; Yu-ichi Hayashi; Arisa Matsubara; Naofumi Homma; Takafumi Aoki; Kazuo Ohta; Kazuo Sakiyama (FPS, 2013)

Meet-in-the-Middle Preimage Attacks Revisited - New Results on MD5 and HAVAL. - Yu Sasaki; Wataru Komatsubara; Yasuhide Sakai; Lei Wang 031; Mitsugu Iwamoto; Kazuo Sakiyama; Kazuo Ohta (SECRYPT, 2013)

Ciphertext-Policy Delegatable Hidden Vector Encryption and Its Application. - Mitsuhiro Hattori; Takato Hirano; Takashi Ito; Nori Matsuda; Takumi Mori; Yusuke Sakai 001; Kazuo Ohta (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2013)

A New Type of Fault-Based Attack: Fault Behavior Analysis. - Yang Li 001; Kazuo Ohta; Kazuo Sakiyama (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2013)

Variety enhancement of PUF responses using the locations of random outputting RS latches. - Dai Yamamoto; Kazuo Sakiyama; Mitsugu Iwamoto; Kazuo Ohta; Masahiko Takenaka; Kouichi Itoh (J. Cryptogr. Eng., 2013)

Reset Indifferentiability from Weakened Random Oracle Salvages One-Pass Hash Functions. - Yusuke Naito 001; Kazuki Yoneyama; Kazuo Ohta (ACNS, 2014)

Constant Rounds Almost Linear Complexity Multi-party Computation for Prefix Sum. - Kazuma Ohara; Kazuo Ohta; Koutarou Suzuki; Kazuki Yoneyama (AFRICACRYPT, 2014)

Privacy-preserving smart metering with verifiability for both billing and energy management. - Kazuma Ohara; Yusuke Sakai 001; Fumiaki Yoshida; Mitsugu Iwamoto; Kazuo Ohta (AsiaPKC@AsiaCCS, 2014)

An Automated Evaluation Tool for Improved Rebound Attack: New Distinguishers and Proposals of ShiftBytes Parameters for Grøstl. - Yu Sasaki; Yuuki Tokushige; Lei Wang 031; Mitsugu Iwamoto; Kazuo Ohta (CT-RSA, 2014)

Secure (M+1) st-Price Auction with Automatic Tie-Break. - Takashi Nishide; Mitsugu Iwamoto; Atsushi Iwasaki; Kazuo Ohta (INTRUST, 2014)

Cheating on a visual secret sharing scheme under a realistic scenario. - Pichanee Lumyong; Mitsugu Iwamoto; Kazuo Ohta (ISITA, 2014)

A new model of Client-Server Communications under information theoretic security. - Mitsugu Iwamoto; Tsukasa Omino; Yuichi Komano; Kazuo Ohta (ITW, 2014)

Single-Chip Implementation and Evaluation of Passive UHF RFID Tag with Hash-Based Mutual Authentication. - Yang Li 001; Shugo Mikami; Dai Watanabe; Kazuo Ohta; Kazuo Sakiyama (RFIDSec Asia, 2014)

Improved Indifferentiable Security Analysis of PHOTON. - Yusuke Naito 001; Kazuo Ohta (SCN, 2014)

Practical improvements of side-channel attacks on AES: feedback from the 2nd DPA contest. - Christophe Clavier; Jean-Luc Danger; Guillaume Duc; M. Abdelaziz Elaabid; Benoît Gérard; Sylvain Guilley; Annelie Heuser; Michael Kasper; Yang Li 001; Victor Lomné; Daisuke Nakatsu; Kazuo Ohta; et al. (J. Cryptogr. Eng., 2014)

Practical DFA Strategy for AES Under Limited-access Conditions. - Kazuo Sakiyama; Yang Li 001; Shigeto Gomisawa; Yu-ichi Hayashi; Mitsugu Iwamoto; Naofumi Homma; Takafumi Aoki; Kazuo Ohta (J. Inf. Process., 2014)

Dynamic Threshold Public-Key Encryption with Decryption Consistency from Static Assumptions. - Yusuke Sakai 001; Keita Emura; Jacob C. N. Schuldt; Goichiro Hanaoka; Kazuo Ohta (ACISP, 2015)

A new method for enhancing variety and maintaining reliability of PUF responses and its evaluation on ASICs. - Dai Yamamoto; Kazuo Sakiyama; Mitsugu Iwamoto; Kazuo Ohta; Masahiko Takenaka; Kouichi Itoh; Naoya Torii (J. Cryptogr. Eng., 2015)

A Silicon-Level Countermeasure Against Fault Sensitivity Analysis and Its Evaluation. - Sho Endo; Yang Li 001; Naofumi Homma; Kazuo Sakiyama; Kazuo Ohta; Daisuke Fujimoto; Makoto Nagata; Toshihiro Katashita; Jean-Luc Danger; Takafumi Aoki (IEEE Trans. Very Large Scale Integr. Syst., 2015)

Probabilistic Generation of Trapdoors: Reducing Information Leakage of Searchable Symmetric Encryption. - Kenichiro Hayasaka; Yutaka Kawai; Yoshihiro Koseki; Takato Hirano; Kazuo Ohta; Mitsugu Iwamoto (CANS, 2016)

Efficient Card-Based Cryptographic Protocols for Millionaires' Problem Utilizing Private Permutations. - Takeshi Nakai; Yuuki Tokushige; Yuto Misawa; Mitsugu Iwamoto; Kazuo Ohta (CANS, 2016)

Simple, Secure, and Efficient Searchable Symmetric Encryption with Multiple Encrypted Indexes. - Takato Hirano; Mitsuhiro Hattori; Yutaka Kawai; Nori Matsuda; Mitsugu Iwamoto; Kazuo Ohta; Yusuke Sakai 001; Tatsuji Munaka (IWSEC, 2016)

A limitation on security evaluation of cryptographic primitives with fixed keys. - Yutaka Kawai; Goichiro Hanaoka; Kazuo Ohta; Noboru Kunihiro (Secur. Commun. Networks, 2016)

Constructions of dynamic and non-dynamic threshold public-key encryption schemes with decryption consistency. - Yusuke Sakai 001; Keita Emura; Jacob C. N. Schuldt; Goichiro Hanaoka; Kazuo Ohta (Theor. Comput. Sci., 2016)

Four Cards Are Sufficient for a Card-Based Three-Input Voting Protocol Utilizing Private Permutations. - Takeshi Nakai; Satoshi Shirouchi; Mitsugu Iwamoto; Kazuo Ohta (ICITS, 2017)

Card-Based Majority Voting Protocols with Three Inputs Using Three Cards. - Yohei Watanabe 001; Yoshihisa Kuroki; Shinnosuke Suzuki; Yuta Koga; Mitsugu Iwamoto; Kazuo Ohta (ISITA, 2018)

Security Formalizations and Their Relationships for Encryption and Key Agreement in Information-Theoretic Cryptography. - Mitsugu Iwamoto; Kazuo Ohta; Junji Shikata (IEEE Trans. Inf. Theory, 2018)

Proceedings of the 11th Asia-Europe Workshop on Concepts in Information Theory. - A. J. Han Vinck; Kees A. Schouhamer Immink; Tadashi Wadayama; Van Khu Vu; Akiko Manada; Kui Cai 001; Shunsuke Horii; Yoshiki Abe; Mitsugu Iwamoto; Kazuo Ohta; Xingwei Zhong; Zhen Mei; et al. (CoRR, 2019)

Efficient Private PEZ Protocols for Symmetric Functions. - Yoshiki Abe; Mitsugu Iwamoto; Kazuo Ohta (IACR Cryptol. ePrint Arch., 2019)

Shortening the Libert-Peters-Yung Revocable Group Signature Scheme by Using the Random Oracle Methodology. - Kazuma Ohara; Keita Emura; Goichiro Hanaoka; Ai Ishida; Kazuo Ohta; Yusuke Sakai 001 (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2019)

Multi-Party Computation for Modular Exponentiation Based on Replicated Secret Sharing. - Kazuma Ohara; Yohei Watanabe 001; Mitsugu Iwamoto; Kazuo Ohta (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2019)

Single-Round Pattern Matching Key Generation Using Physically Unclonable Function. - Yuichi Komano; Kazuo Ohta; Kazuo Sakiyama; Mitsugu Iwamoto; Ingrid Verbauwhede (Secur. Commun. Networks, 2019)

How to Detect Malicious Behaviors in a Card-Based Majority Voting Protocol with Three Inputs. - Yoshiki Abe; Mitsugu Iwamoto; Kazuo Ohta (ISITA, 2020)

A Key Recovery Algorithm Using Random Key Leakage from AES Key Schedule. - Tomoki Uemura; Yohei Watanabe 001; Yang Li 001; Noriyuki Miura; Mitsugu Iwamoto; Kazuo Sakiyama; Kazuo Ohta (ISITA, 2020)

Cryptanalysis of Aggregate Γ-Signature and Practical Countermeasures in Application to Bitcoin. - Goichiro Hanaoka; Kazuo Ohta; Yusuke Sakai 001; Bagus Santoso; Kaoru Takemure; Yunlei Zhao (IACR Cryptol. ePrint Arch., 2020)

Achieving Pairing-Free Aggregate Signatures using Pre-Communication between Signers. - Kaoru Takemure; Yusuke Sakai 001; Bagus Santoso; Goichiro Hanaoka; Kazuo Ohta (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2021)

How to Solve Millionaires' Problem with Two Kinds of Cards. - Takeshi Nakai; Yuto Misawa; Yuuki Tokushige; Mitsugu Iwamoto; Kazuo Ohta (New Gener. Comput., 2021)

Efficient Dynamic Searchable Encryption with Forward Privacy under the Decent Leakage. - Yohei Watanabe 001; Kazuma Ohara; Mitsugu Iwamoto; Kazuo Ohta (CODASPY, 2022)

Lightweight Authentication Using Noisy Key Derived from Physically Unclonable Function. - Yuichi Komano; Mitsugu Iwamoto; Kazuo Ohta; Kazuo Sakiyama (SecITC, 2022)

Efficient Card-Based Majority Voting Protocols. - Yoshiki Abe; Takeshi Nakai; Yoshihisa Kuroki; Shinnosuke Suzuki; Yuta Koga; Yohei Watanabe 001; Mitsugu Iwamoto; Kazuo Ohta (New Gener. Comput., 2022)

Secure Computation for Threshold Functions with Physical Cards: Power of Private Permutations. - Takeshi Nakai; Satoshi Shirouchi; Yuuki Tokushige; Mitsugu Iwamoto; Kazuo Ohta (New Gener. Comput., 2022)

How to Make a Secure Index for Searchable Symmetric Encryption, Revisited. - Yohei Watanabe 001; Takeshi Nakai; Kazuma Ohara; Takuya Nojima; Yexuan Liu; Mitsugu Iwamoto; Kazuo Ohta (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2022)

More Efficient Two-Round Multi-Signature Scheme with Provably Secure Parameters. - Kaoru Takemure; Yusuke Sakai 001; Bagus Santoso; Goichiro Hanaoka; Kazuo Ohta (IACR Cryptol. ePrint Arch., 2023)

A Computationally Efficient Card-Based Majority Voting Protocol with Fewer Cards in the Private Model. - Yoshiki Abe; Takeshi Nakai; Yohei Watanabe 001; Mitsugu Iwamoto; Kazuo Ohta (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2023)

Multi-user Dynamic Searchable Encryption for Prefix-Fixing Predicates from Symmetric-Key Primitives. - Takato Hirano; Yutaka Kawai; Yoshihiro Koseki; Satoshi Yasuda; Yohei Watanabe 001; Takumi Amada; Mitsugu Iwamoto; Kazuo Ohta (SAC (1), 2024)

More Efficient Two-Round Multi-Signature Scheme with Provably Secure Parameters for Standardized Elliptic Curves. - Kaoru Takemure; Yusuke Sakai 001; Bagus Santoso; Goichiro Hanaoka; Kazuo Ohta (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2024)

Revisiting Relations of Security Notions in Searchable Encryption. - Kazuki Sato; Takumi Amada; Kyoichi Asano; Yohei Watanabe 001; Mitsugu Iwamoto; Kazuo Ohta (APKC@AsiaCCS, 2025)