Kazuo Ohta

211 papers A* 22A 14B 18C 21Misc 17Journal 87Unranked 31
YearRankTypeTitle / Venue / Authors
2025 — conf
Revisiting Relations of Security Notions in Searchable Encryption.
APKC@AsiaCCS
Kazuki Sato, Takumi Amada, Kyoichi Asano, Yohei Watanabe, Mitsugu Iwamoto, Kazuo Ohta
2024 J jnl
More Efficient Two-Round Multi-Signature Scheme with Provably Secure Parameters for Standardized Elliptic Curves.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Kaoru Takemure, Yusuke Sakai, Bagus Santoso, Goichiro Hanaoka, Kazuo Ohta
2024 — conf
Multi-user Dynamic Searchable Encryption for Prefix-Fixing Predicates from Symmetric-Key Primitives.
SAC (1)
Takato Hirano, Yutaka Kawai, Yoshihiro Koseki, Satoshi Yasuda, Yohei Watanabe, Takumi Amada, Mitsugu Iwamoto, Kazuo Ohta
2023 J jnl
A Computationally Efficient Card-Based Majority Voting Protocol with Fewer Cards in the Private Model.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Yoshiki Abe, Takeshi Nakai, Yohei Watanabe, Mitsugu Iwamoto, Kazuo Ohta
2023 J jnl
More Efficient Two-Round Multi-Signature Scheme with Provably Secure Parameters.
IACR Cryptol. ePrint Arch.
Kaoru Takemure, Yusuke Sakai, Bagus Santoso, Goichiro Hanaoka, Kazuo Ohta
2022 J jnl
Efficient Card-Based Majority Voting Protocols.
New Gener. Comput.
Yoshiki Abe, Takeshi Nakai, Yoshihisa Kuroki, Shinnosuke Suzuki, Yuta Koga, Yohei Watanabe, Mitsugu Iwamoto, Kazuo Ohta
2022 — conf
Efficient Dynamic Searchable Encryption with Forward Privacy under the Decent Leakage.
CODASPY
Yohei Watanabe, Kazuma Ohara, Mitsugu Iwamoto, Kazuo Ohta
2022 J jnl
How to Make a Secure Index for Searchable Symmetric Encryption, Revisited.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Yohei Watanabe, Takeshi Nakai, Kazuma Ohara, Takuya Nojima, Yexuan Liu, Mitsugu Iwamoto, Kazuo Ohta
2022 — conf
Lightweight Authentication Using Noisy Key Derived from Physically Unclonable Function.
SecITC
Yuichi Komano, Mitsugu Iwamoto, Kazuo Ohta, Kazuo Sakiyama
2022 J jnl
Secure Computation for Threshold Functions with Physical Cards: Power of Private Permutations.
New Gener. Comput.
Takeshi Nakai, Satoshi Shirouchi, Yuuki Tokushige, Mitsugu Iwamoto, Kazuo Ohta
2021 J jnl
Achieving Pairing-Free Aggregate Signatures using Pre-Communication between Signers.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Kaoru Takemure, Yusuke Sakai, Bagus Santoso, Goichiro Hanaoka, Kazuo Ohta
2021 J jnl
How to Make a Secure Index for Searchable Symmetric Encryption, Revisited.
IACR Cryptol. ePrint Arch.
Yohei Watanabe, Takeshi Nakai, Kazuma Ohara, Takuya Nojima, Yexuan Liu, Mitsugu Iwamoto, Kazuo Ohta
2021 J jnl
How to Solve Millionaires' Problem with Two Kinds of Cards.
New Gener. Comput.
Takeshi Nakai, Yuto Misawa, Yuuki Tokushige, Mitsugu Iwamoto, Kazuo Ohta
2020 C conf
A Key Recovery Algorithm Using Random Key Leakage from AES Key Schedule.
ISITA
Tomoki Uemura, Yohei Watanabe, Yang Li, Noriyuki Miura, Mitsugu Iwamoto, Kazuo Sakiyama, Kazuo Ohta
2020 C conf
Achieving Pairing-Free Aggregate Signatures using Pre-Communication between Signers.
ProvSec
Kaoru Takemure, Yusuke Sakai, Bagus Santoso, Goichiro Hanaoka, Kazuo Ohta
2020 J jnl
Cryptanalysis of Aggregate Γ-Signature and Practical Countermeasures in Application to Bitcoin.
IACR Cryptol. ePrint Arch.
Goichiro Hanaoka, Kazuo Ohta, Yusuke Sakai, Bagus Santoso, Kaoru Takemure, Yunlei Zhao
2020 C conf
How to Detect Malicious Behaviors in a Card-Based Majority Voting Protocol with Three Inputs.
ISITA
Yoshiki Abe, Mitsugu Iwamoto, Kazuo Ohta
2019 — conf
Efficient Private PEZ Protocols for Symmetric Functions.
TCC (1)
Yoshiki Abe, Mitsugu Iwamoto, Kazuo Ohta
2019 J jnl
Efficient Private PEZ Protocols for Symmetric Functions.
IACR Cryptol. ePrint Arch.
Yoshiki Abe, Mitsugu Iwamoto, Kazuo Ohta
2019 J jnl
Multi-Party Computation for Modular Exponentiation Based on Replicated Secret Sharing.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Kazuma Ohara, Yohei Watanabe, Mitsugu Iwamoto, Kazuo Ohta
2019 J jnl
Proceedings of the 11th Asia-Europe Workshop on Concepts in Information Theory.
CoRR
A. J. Han Vinck, Kees A. Schouhamer Immink, Tadashi Wadayama, Van Khu Vu, Akiko Manada, Kui Cai, Shunsuke Horii, Yoshiki Abe, Mitsugu Iwamoto, Kazuo Ohta, Xingwei Zhong, Zhen Mei, Renfei Bu, Jos H. Weber, Vitaly Skachek, Hiroyoshi Morita, N. Hovhannisyan, Hiroshi Kamabe, Shan Lu, Hirosuke Yamamoto, Kengo Hashimoto, Øyvind Ytrehus, Shigeaki Kuzuoka, Mikihiko Nishiara, Han Mao Kiah, Jun Muramatsu, Shigeki Miyake
2019 J jnl
Shortening the Libert-Peters-Yung Revocable Group Signature Scheme by Using the Random Oracle Methodology.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Kazuma Ohara, Keita Emura, Goichiro Hanaoka, Ai Ishida, Kazuo Ohta, Yusuke Sakai
2019 J jnl
Single-Round Pattern Matching Key Generation Using Physically Unclonable Function.
Secur. Commun. Networks
Yuichi Komano, Kazuo Ohta, Kazuo Sakiyama, Mitsugu Iwamoto, Ingrid Verbauwhede
2018 C conf
Card-Based Majority Voting Protocols with Three Inputs Using Three Cards.
ISITA
Yohei Watanabe, Yoshihisa Kuroki, Shinnosuke Suzuki, Yuta Koga, Mitsugu Iwamoto, Kazuo Ohta
2018 J jnl
Security Formalizations and Their Relationships for Encryption and Key Agreement in Information-Theoretic Cryptography.
IEEE Trans. Inf. Theory
Mitsugu Iwamoto, Kazuo Ohta, Junji Shikata
2017 — conf
Four Cards Are Sufficient for a Card-Based Three-Input Voting Protocol Utilizing Private Permutations.
ICITS
Takeshi Nakai, Satoshi Shirouchi, Mitsugu Iwamoto, Kazuo Ohta
2016 J jnl
A limitation on security evaluation of cryptographic primitives with fixed keys.
Secur. Commun. Networks
Yutaka Kawai, Goichiro Hanaoka, Kazuo Ohta, Noboru Kunihiro
2016 J jnl
Constructions of dynamic and non-dynamic threshold public-key encryption schemes with decryption consistency.
Theor. Comput. Sci.
Yusuke Sakai, Keita Emura, Jacob C. N. Schuldt, Goichiro Hanaoka, Kazuo Ohta
2016 B conf
Efficient Card-Based Cryptographic Protocols for Millionaires' Problem Utilizing Private Permutations.
CANS
Takeshi Nakai, Yuuki Tokushige, Yuto Misawa, Mitsugu Iwamoto, Kazuo Ohta
2016 B conf
Probabilistic Generation of Trapdoors: Reducing Information Leakage of Searchable Symmetric Encryption.
CANS
Kenichiro Hayasaka, Yutaka Kawai, Yoshihiro Koseki, Takato Hirano, Kazuo Ohta, Mitsugu Iwamoto
2016 J jnl
Shortening the Libert-Peters-Yung Revocable Group Signature Scheme by Using the Random Oracle Methodology.
IACR Cryptol. ePrint Arch.
Kazuma Ohara, Keita Emura, Goichiro Hanaoka, Ai Ishida, Kazuo Ohta, Yusuke Sakai
2016 Misc conf
Simple, Secure, and Efficient Searchable Symmetric Encryption with Multiple Encrypted Indexes.
IWSEC
Takato Hirano, Mitsuhiro Hattori, Yutaka Kawai, Nori Matsuda, Mitsugu Iwamoto, Kazuo Ohta, Yusuke Sakai, Tatsuji Munaka
2015 J jnl
A Silicon-Level Countermeasure Against Fault Sensitivity Analysis and Its Evaluation.
IEEE Trans. Very Large Scale Integr. Syst.
Sho Endo, Yang Li, Naofumi Homma, Kazuo Sakiyama, Kazuo Ohta, Daisuke Fujimoto, Makoto Nagata, Toshihiro Katashita, Jean-Luc Danger, Takafumi Aoki
2015 J jnl
A new method for enhancing variety and maintaining reliability of PUF responses and its evaluation on ASICs.
J. Cryptogr. Eng.
Dai Yamamoto, Kazuo Sakiyama, Mitsugu Iwamoto, Kazuo Ohta, Masahiko Takenaka, Kouichi Itoh, Naoya Torii
2015 Misc conf
Dynamic Threshold Public-Key Encryption with Decryption Consistency from Static Assumptions.
ACISP
Yusuke Sakai, Keita Emura, Jacob C. N. Schuldt, Goichiro Hanaoka, Kazuo Ohta
2014 B conf
A new model of Client-Server Communications under information theoretic security.
ITW
Mitsugu Iwamoto, Tsukasa Omino, Yuichi Komano, Kazuo Ohta
2014 B conf
An Automated Evaluation Tool for Improved Rebound Attack: New Distinguishers and Proposals of ShiftBytes Parameters for Grøstl.
CT-RSA
Yu Sasaki, Yuuki Tokushige, Lei Wang, Mitsugu Iwamoto, Kazuo Ohta
2014 C conf
Cheating on a visual secret sharing scheme under a realistic scenario.
ISITA
Pichanee Lumyong, Mitsugu Iwamoto, Kazuo Ohta
2014 — conf
Constant Rounds Almost Linear Complexity Multi-party Computation for Prefix Sum.
AFRICACRYPT
Kazuma Ohara, Kazuo Ohta, Koutarou Suzuki, Kazuki Yoneyama
2014 Misc conf
Improved Indifferentiable Security Analysis of PHOTON.
SCN
Yusuke Naito, Kazuo Ohta
2014 J jnl
Practical DFA Strategy for AES Under Limited-access Conditions.
J. Inf. Process.
Kazuo Sakiyama, Yang Li, Shigeto Gomisawa, Yu-ichi Hayashi, Mitsugu Iwamoto, Naofumi Homma, Takafumi Aoki, Kazuo Ohta
2014 J jnl
Practical improvements of side-channel attacks on AES: feedback from the 2nd DPA contest.
J. Cryptogr. Eng.
Christophe Clavier, Jean-Luc Danger, Guillaume Duc, M. Abdelaziz Elaabid, Benoît Gérard, Sylvain Guilley, Annelie Heuser, Michael Kasper, Yang Li, Victor Lomné, Daisuke Nakatsu, Kazuo Ohta, Kazuo Sakiyama, Laurent Sauvage, Werner Schindler, Marc Stöttinger, Nicolas Veyrat-Charvillon, Matthieu Walle, Antoine Wurcker
2014 — conf
Privacy-preserving smart metering with verifiability for both billing and energy management.
AsiaPKC@AsiaCCS
Kazuma Ohara, Yusuke Sakai, Fumiaki Yoshida, Mitsugu Iwamoto, Kazuo Ohta
2014 B conf
Reset Indifferentiability from Weakened Random Oracle Salvages One-Pass Hash Functions.
ACNS
Yusuke Naito, Kazuki Yoneyama, Kazuo Ohta
2014 — conf
Secure (M+1) st-Price Auction with Automatic Tie-Break.
INTRUST
Takashi Nishide, Mitsugu Iwamoto, Atsushi Iwasaki, Kazuo Ohta
2014 J jnl
Security Formalizations and Their Relationships for Encryption and Key Agreement in Information-Theoretic Cryptography.
CoRR
Mitsugu Iwamoto, Kazuo Ohta, Junji Shikata
2014 — conf
Single-Chip Implementation and Evaluation of Passive UHF RFID Tag with Hash-Based Mutual Authentication.
RFIDSec Asia
Yang Li, Shugo Mikami, Dai Watanabe, Kazuo Ohta, Kazuo Sakiyama
2013 J jnl
A New Type of Fault-Based Attack: Fault Behavior Analysis.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Yang Li, Kazuo Ohta, Kazuo Sakiyama
2013 J jnl
Ciphertext-Policy Delegatable Hidden Vector Encryption and Its Application.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Mitsuhiro Hattori, Takato Hirano, Takashi Ito, Nori Matsuda, Takumi Mori, Yusuke Sakai, Kazuo Ohta
2013 — conf
Exploring the Relations between Fault Sensitivity and Power Consumption.
COSADE
Yang Li, Sho Endo, Nicolas Debande, Naofumi Homma, Takafumi Aoki, Thanh-Ha Le, Jean-Luc Danger, Kazuo Ohta, Kazuo Sakiyama
2013 C conf
Meet-in-the-Middle Preimage Attacks Revisited - New Results on MD5 and HAVAL.
SECRYPT
Yu Sasaki, Wataru Komatsubara, Yasuhide Sakai, Lei Wang, Mitsugu Iwamoto, Kazuo Sakiyama, Kazuo Ohta
2013 J jnl
Variety enhancement of PUF responses using the locations of random outputting RS latches.
J. Cryptogr. Eng.
Dai Yamamoto, Kazuo Sakiyama, Mitsugu Iwamoto, Kazuo Ohta, Masahiko Takenaka, Kouichi Itoh
2013 — conf
Yet Another Fault-Based Leakage in Non-uniform Faulty Ciphertexts.
FPS
Yang Li, Yu-ichi Hayashi, Arisa Matsubara, Naofumi Homma, Takafumi Aoki, Kazuo Ohta, Kazuo Sakiyama
2012 C conf
An Efficient Countermeasure against Fault Sensitivity Analysis Using Configurable Delay Blocks.
FDTC
Sho Endo, Yang Li, Naofumi Homma, Kazuo Sakiyama, Kazuo Ohta, Takafumi Aoki
2012 Misc conf
An Extension of Fault Sensitivity Analysis Based on Clockwise Collision.
Inscrypt
Yang Li, Kazuo Ohta, Kazuo Sakiyama
2012 Misc conf
Boomerang Distinguishers for Full HAS-160 Compression Function.
IWSEC
Yu Sasaki, Lei Wang, Yasuhiro Takasaki, Kazuo Sakiyama, Kazuo Ohta
2012 J jnl
Fair and Consistent Hardware Evaluation of Fourteen Round Two SHA-3 Candidates.
IEEE Trans. Very Large Scale Integr. Syst.
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
2012 — ch.
Fault Injection and Key Retrieval Experiments on an Evaluation Board.
Fault Analysis in Cryptography
Junko Takahashi, Toshinori Fukunaga, Shigeto Gomisawa, Yang Li, Kazuo Sakiyama, Kazuo Ohta
2012 J jnl
Information-Theoretic Approach to Optimal Differential Fault Analysis.
IEEE Trans. Inf. Forensics Secur.
Kazuo Sakiyama, Yang Li, Mitsugu Iwamoto, Kazuo Ohta
2012 Misc conf
Key-Dependent Weakness of AES-Based Ciphers under Clockwise Collision Distinguisher.
ICISC
Toshiki Nakasone, Yang Li, Yu Sasaki, Mitsugu Iwamoto, Kazuo Ohta, Kazuo Sakiyama
2012 J jnl
Meet-in-the-Middle (Second) Preimage Attacks on Two Double-Branch Hash Functions RIPEMD and RIPEMD-128.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Lei Wang, Yu Sasaki, Wataru Komatsubara, Kazuo Sakiyama, Kazuo Ohta
2012 J jnl
New Fault-Based Side-Channel Attack Using Fault Sensitivity.
IEEE Trans. Inf. Forensics Secur.
Yang Li, Kazuo Ohta, Kazuo Sakiyama
2012 C conf
New Truncated Differential Cryptanalysis on 3D Block Cipher.
ISPEC
Takuma Koyama, Lei Wang, Yu Sasaki, Kazuo Sakiyama, Kazuo Ohta
2012 — conf
On the Security of Dynamic Group Signatures: Preventing Signature Hijacking.
Public Key Cryptography
Yusuke Sakai, Jacob C. N. Schuldt, Keita Emura, Goichiro Hanaoka, Kazuo Ohta
2012 J jnl
On the Security of Dynamic Group Signatures: Preventing Signature Hijacking.
IACR Cryptol. ePrint Arch.
Yusuke Sakai, Jacob C. N. Schuldt, Keita Emura, Goichiro Hanaoka, Kazuo Ohta
2012 Misc conf
Polynomial-Advantage Cryptanalysis of 3D Cipher and 3D-Based Hash Function.
IWSEC
Lei Wang, Yu Sasaki, Kazuo Sakiyama, Kazuo Ohta
2012 — conf
Three-Subset Meet-in-the-Middle Attack on Reduced XTEA.
AFRICACRYPT
Yu Sasaki, Lei Wang, Yasuhide Sakai, Kazuo Sakiyama, Kazuo Ohta
2012 J jnl
Toward Effective Countermeasures against an Improved Fault Sensitivity Analysis.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Yang Li, Kazuo Ohta, Kazuo Sakiyama
2011 B conf
(Second) Preimage Attacks on Step-Reduced RIPEMD/RIPEMD-128 with a New Local-Collision Approach.
CT-RSA
Lei Wang, Yu Sasaki, Wataru Komatsubara, Kazuo Ohta, Kazuo Sakiyama
2011 — conf
A Study on Computational Formal Verification for Practical Cryptographic Protocol: The Case of Synchronous RFID Authentication.
Financial Cryptography Workshops
Yoshikazu Hanatani, Miyako Ohkubo, Shin'ichiro Matsuo, Kazuo Sakiyama, Kazuo Ohta
2011 J jnl
An Efficient Authentication for Lightweight Devices by Perfecting Zero-Knowledgeness.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Bagus Santoso, Kazuo Ohta, Kazuo Sakiyama, Goichiro Hanaoka
2011 C conf
Ciphertext-Policy Delegatable Hidden Vector Encryption and Its Application to Searchable Encryption in Multi-user Setting.
IMACC
Mitsuhiro Hattori, Takato Hirano, Takashi Ito, Nori Matsuda, Takumi Mori, Yusuke Sakai, Kazuo Ohta
2011 J jnl
Clockwise Collision Analysis - Overlooked Side-Channel Leakage Inside Your Measurements.
IACR Cryptol. ePrint Arch.
Yang Li, Daisuke Nakatsu, Qi Li, Kazuo Ohta, Kazuo Sakiyama
2011 Misc conf
Experimental Verification of Super-Sbox Analysis - Confirmation of Detailed Attack Complexity.
IWSEC
Yu Sasaki, Naoyuki Takayanagi, Kazuo Sakiyama, Kazuo Ohta
2011 C conf
Fault Sensitivity Analysis Against Elliptic Curve Cryptosystems.
FDTC
Hikaru Sakamoto, Yang Li, Kazuo Ohta, Kazuo Sakiyama
2011 J jnl
How to Shorten a Ciphertext of Reproducible Key Encapsulation Mechanisms in the Random Oracle Model.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Yusuke Sakai, Goichiro Hanaoka, Kaoru Kurosawa, Kazuo Ohta
2011 A conf
On the Power of Fault Sensitivity Analysis and Collision Side-Channel Attacks in a Combined Setting.
CHES
Amir Moradi, Oliver Mischke, Christof Paar, Yang Li, Kazuo Ohta, Kazuo Sakiyama
2011 J jnl
Power Analysis against a DPA-Resistant S-Box Implementation Based on the Fourier Transform.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Yang Li, Kazuo Sakiyama, Shin-ichi Kawamura, Kazuo Ohta
2011 J jnl
Proxiable Designated Verifier Signature.
Inf. Media Technol.
Mebae Ushida, Yutaka Kawai, Kazuki Yoneyama, Kazuo Ohta
2011 J jnl
Proxiable Designated Verifier Signature.
J. Inf. Process.
Mebae Ushida, Yutaka Kawai, Kazuki Yoneyama, Kazuo Ohta
2011 — conf
Revisit fault sensitivity analysis on WDDL-AES.
HOST
Yang Li, Kazuo Ohta, Kazuo Sakiyama
2011 J jnl
Security Notions for Information Theoretically Secure Encryptions
CoRR
Mitsugu Iwamoto, Kazuo Ohta
2011 B conf
Security notions for information theoretically secure encryptions.
ISIT
Mitsugu Iwamoto, Kazuo Ohta
2011 J jnl
Security of Cryptosystems Using Merkle-Damgård in the Random Oracle Model.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Yusuke Naito, Kazuki Yoneyama, Lei Wang, Kazuo Ohta
2011 C conf
Security of Practical Cryptosystems Using Merkle-Damgård Hash Function in the Ideal Cipher Model.
ProvSec
Yusuke Naito, Kazuki Yoneyama, Lei Wang, Kazuo Ohta
2011 J jnl
Ultra-Wideband Array Antenna Utilizing Novel Scanning System with Tapped Delay Lines for Short Range Radar.
IEICE Trans. Commun.
Fuminori Sakai, Kazuo Ohta, Kunio Sawaya
2011 A conf
Uniqueness Enhancement of PUF Responses Based on the Locations of Random Outputting RS Latches.
CHES
Dai Yamamoto, Kazuo Sakiyama, Mitsugu Iwamoto, Kazuo Ohta, Takao Ochiai, Masahiko Takenaka, Kouichi Itoh
2011 J jnl
Universally Composable NBAC-Based Fair Voucher Exchange for Mobile Environments.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Kazuki Yoneyama, Masayuki Terada, Sadayuki Hongo, Kazuo Ohta
2011 — conf
Yet Another Sanitizable and Deletable Signatures.
AINA Workshops
Tetsuya Izu, Masami Izumi, Noboru Kunihiro, Kazuo Ohta
2010 Misc conf
A Generic Method for Reducing Ciphertext Length of Reproducible KEMs in the RO Model.
IWSEC
Yusuke Sakai, Goichiro Hanaoka, Kaoru Kurosawa, Kazuo Ohta
2010 — conf
An Evaluation of the Sieving Device YASD for 1024-Bit Integers.
NBiS
Naoyuki Hirota, Tetsuya Izu, Noboru Kunihiro, Kazuo Ohta
2010 J jnl
An Information Theoretic Perspective on the Differential Fault Analysis against AES.
IACR Cryptol. ePrint Arch.
Yang Li, Shigeto Gomisawa, Kazuo Sakiyama, Kazuo Ohta
2010 Misc conf
Combination of SW Countermeasure and CPU Modification on FPGA against Power Analysis.
WISA
Daisuke Nakatsu, Yang Li, Kazuo Sakiyama, Kazuo Ohta
2010 J jnl
Cryptanalysis of Two MD5-Based Authentication Protocols: APOP and NMAC.
IEICE Trans. Inf. Syst.
Lei Wang, Kazuo Ohta, Yu Sasaki, Kazuo Sakiyama, Noboru Kunihiro
2010 J jnl
Efficient Differential Fault Analysis for AES.
IACR Cryptol. ePrint Arch.
Shigeto Gomisawa, Yang Li, Junko Takahashi, Toshinori Fukunaga, Yu Sasaki, Kazuo Sakiyama, Kazuo Ohta
2010 J jnl
Evaluation of Hardware Performance for the SHA-3 Candidates Using SASEBO-GII.
IACR Cryptol. ePrint Arch.
Kazuyuki Kobayashi, Jun Ikegami, Shin'ichiro Matsuo, Kazuo Sakiyama, Kazuo Ohta
2010 J jnl
Extension of Secret Handshake Protocols with Multiple Groups in Monotone Condition.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Yutaka Kawai, Shotaro Tanno, Takahiro Kondo, Kazuki Yoneyama, Kazuo Ohta, Noboru Kunihiro
2010 A conf
Fault Sensitivity Analysis.
CHES
Yang Li, Kazuo Sakiyama, Shigeto Gomisawa, Toshinori Fukunaga, Junko Takahashi, Kazuo Ohta
2010 A conf
Improved countermeasure against Address-bit DPA for ECC scalar multiplication.
DATE
Masami Izumi, Jun Ikegami, Kazuo Sakiyama, Kazuo Ohta
2010 B conf
Improving Efficiency of an ‘On the Fly' Identification Scheme by Perfecting Zero-Knowledgeness.
CT-RSA
Bagus Santoso, Kazuo Ohta, Kazuo Sakiyama, Goichiro Hanaoka
2010 B conf
Multiple Designated Verifiers Signatures Reconsidered.
ARES
Mebae Ushida, Tetsuya Izu, Masahiko Takenaka, Kazuo Ohta
2010 A conf
Non-full-active Super-Sbox Analysis: Applications to ECHO and Grøstl.
ASIACRYPT
Yu Sasaki, Yang Li, Lei Wang, Kazuo Sakiyama, Kazuo Ohta
2010 J jnl
On Clock-Based Fault Analysis Attack for an AES Hardware Using RSL.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Kazuo Sakiyama, Kazuo Ohta
2010 A conf
Power Variance Analysis breaks a masked ASIC implementation of AES.
DATE
Yang Li, Kazuo Sakiyama, Lejla Batina, Daisuke Nakatsu, Kazuo Ohta
2010 J jnl
Practical Password Recovery Attacks on MD4 Based Prefix and Hybrid Authentication Protocols.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Yu Sasaki, Lei Wang, Kazuo Ohta, Kazumaro Aoki, Noboru Kunihiro
2010 — conf
Prototyping Platform for Performance Evaluation of SHA-3 Candidates.
HOST
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
2010 — conf
Proxiable Designated Verifier Signature.
ICETE (Selected Papers)
Mebae Ushida, Yutaka Kawai, Kazuki Yoneyama, Kazuo Ohta
2010 C conf
Proxiable Designated Verifier Signature.
SECRYPT
Mebae Ushida, Kazuo Ohta, Yutaka Kawai, Kazuki Yoneyama
2010 Misc conf
Rigorous Security Requirements for Designated Verifier Signatures.
Inscrypt
Kazuki Yoneyama, Mebae Ushida, Kazuo Ohta
2010 J jnl
Robust RFID Authentication Protocol with Formal Proof and Its Feasibility.
IACR Cryptol. ePrint Arch.
Miyako Ohkubo, Shin'ichiro Matsuo, Yoshikazu Hanatani, Kazuo Sakiyama, Kazuo Ohta
2010 — conf
Universally Composable NBAC-Based Fair Voucher Exchange for Mobile Environments.
IWSEC (Short Papers)
Kazuki Yoneyama, Masayuki Terada, Sadayuki Hongo, Kazuo Ohta
2009 J jnl
A New 'On the Fly' Identification Scheme: An Asymptoticity Trade-Off between ZK and Correctness.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Bagus Santoso, Kazuo Ohta
2009 B conf
A New Approach for Implementing the MPL Method toward Higher SPA Resistance.
ARES
Masami Izumi, Kazuo Sakiyama, Kazuo Ohta
2009 J jnl
A Strict Evaluation on the Number of Conditions for SHA-1 Collision Search.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Jun Yajima, Terutoshi Iwasaki, Yusuke Naito, Yu Sasaki, Takeshi Shimoyama, Thomas Peyrin, Noboru Kunihiro, Kazuo Ohta
2009 B conf
Algorithmic Tamper Proof (ATP) Counter Units for Authentication Devices Using PIN.
ACNS
Yuichi Komano, Kazuo Ohta, Hideyuki Miyake, Atsushi Shimbo
2009 J jnl
Attribute-Based Encryption with Partially Hidden Ciphertext Policies.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Takashi Nishide, Kazuki Yoneyama, Kazuo Ohta
2009 Misc conf
Bit-Free Collision: Application to APOP Attack.
IWSEC
Lei Wang, Yu Sasaki, Kazuo Sakiyama, Kazuo Ohta
2009 J jnl
Extended Password Recovery Attacks against APOP, SIP, and Digest Authentication.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Yu Sasaki, Lei Wang, Kazuo Ohta, Noboru Kunihiro
2009 B conf
Fault Analysis Attack against an AES Prototype Chip Using RSL.
CT-RSA
Kazuo Sakiyama, Tatsuya Yagi, Kazuo Ohta
2009 J jnl
Foreword.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Kazuo Ohta
2009 A conf
How to Confirm Cryptosystems Security: The Original Merkle-Damgård Is Still Alive!
ASIACRYPT
Yusuke Naito, Kazuki Yoneyama, Lei Wang, Kazuo Ohta
2009 J jnl
How to Construct Cryptosystems and Hash Functions in Weakened Random Oracle Models.
IACR Cryptol. ePrint Arch.
Yusuke Naito, Lei Wang, Kazuo Ohta
2009 J jnl
How to Prove the Security of Practical Cryptosystems with Merkle-Damgård Hashing by Adopting Indifferentiability.
IACR Cryptol. ePrint Arch.
Yusuke Naito, Kazuki Yoneyama, Lei Wang, Kazuo Ohta
2009 J jnl
Leaky Random Oracle.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Kazuki Yoneyama, Satoshi Miyagawa, Kazuo Ohta
2009 J jnl
Near-Collision Attacks on MD4: Applied to MD4-Based Protocols.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Lei Wang, Kazuo Ohta, Noboru Kunihiro
2009 C conf
Secret Handshake: Strong Anonymity Definition and Construction.
ISPEC
Yutaka Kawai, Kazuki Yoneyama, Kazuo Ohta
2009 J jnl
Secret Handshake: Strong Anonymity Definition and Construction.
IACR Cryptol. ePrint Arch.
Yutaka Kawai, Kazuki Yoneyama, Kazuo Ohta
2009 C conf
Security Evaluation of a DPA-Resistant S-Box Based on the Fourier Transform.
ICICS
Yang Li, Kazuo Sakiyama, Shin-ichi Kawamura, Yuichi Komano, Kazuo Ohta
2009 J jnl
Security of Practical Cryptosystems Using Merkle-Damgard Hash Function in the Ideal Cipher Model.
IACR Cryptol. ePrint Arch.
Yusuke Naito, Kazuki Yoneyama, Lei Wang, Kazuo Ohta
2009 B conf
Yet Another Sanitizable Signature from Bilinear Maps.
ARES
Tetsuya Izu, Noboru Kunihiro, Kazuo Ohta, Makoto Sano, Masahiko Takenaka
2008 A conf
A strict evaluation method on the number of conditions for the SHA-1 collision search.
AsiaCCS
Jun Yajima, Terutoshi Iwasaki, Yusuke Naito, Yu Sasaki, Takeshi Shimoyama, Noboru Kunihiro, Kazuo Ohta
2008 B conf
Attribute-Based Encryption with Partially Hidden Encryptor-Specified Access Structures.
ACNS
Takashi Nishide, Kazuki Yoneyama, Kazuo Ohta
2008 Misc conf
Extension of Secret Handshake Protocols with Multiple Groups in Monotone Condition.
WISA
Yutaka Kawai, Shotaro Tanno, Takahiro Kondo, Kazuki Yoneyama, Noboru Kunihiro, Kazuo Ohta
2008 J jnl
Factorization of Square-Free Integers with High Bits Known.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Bagus Santoso, Noboru Kunihiro, Naoki Kanayama, Kazuo Ohta
2008 J jnl
Improved Collision Search for Hash Functions: New Advanced Message Modification.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Yusuke Naito, Kazuo Ohta, Noboru Kunihiro
2008 C conf
Leaky Random Oracle (Extended Abstract).
ProvSec
Kazuki Yoneyama, Satoshi Miyagawa, Kazuo Ohta
2008 A* conf
New Key-Recovery Attacks on HMAC/NMAC-MD4 and NMAC-MD5.
EUROCRYPT
Lei Wang, Kazuo Ohta, Noboru Kunihiro
2008 J jnl
New Message Differences for Collision Attacks on MD4 and MD5.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Yu Sasaki, Lei Wang, Noboru Kunihiro, Kazuo Ohta
2008 — conf
Password Recovery on Challenge and Response: Impossible Differential Attack on Hash Function.
AFRICACRYPT
Yu Sasaki, Lei Wang, Kazuo Ohta, Noboru Kunihiro
2008 J jnl
Provably Secure Multisignatures in Formal Security Model and Their Optimality.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Yuichi Komano, Kazuo Ohta, Atsushi Shimbo, Shin-ichi Kawamura
2008 Misc conf
Sanitizable and Deletable Signature.
WISA
Tetsuya Izu, Noboru Kunihiro, Kazuo Ohta, Makoto Sano, Masahiko Takenaka
2008 B conf
Security of MD5 Challenge and Response: Extension of APOP Password Recovery Attack.
CT-RSA
Yu Sasaki, Lei Wang, Kazuo Ohta, Noboru Kunihiro
2007 Misc conf
A New Strategy for Finding a Differential Path of SHA-1.
ACISP
Jun Yajima, Yu Sasaki, Yusuke Naito, Terutoshi Iwasaki, Takeshi Shimoyama, Noboru Kunihiro, Kazuo Ohta
2007 C conf
A Sanitizable Signature Scheme with Aggregation.
ISPEC
Tetsuya Izu, Noboru Kunihiro, Kazuo Ohta, Masahiko Takenaka, Takashi Yoshioka
2007 J jnl
Constant-Round Multiparty Computation for Interval Test, Equality Test, and Comparison.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Takashi Nishide, Kazuo Ohta
2007 J jnl
Improved Collision Attacks on MD4 and MD5.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Yu Sasaki, Yusuke Naito, Noboru Kunihiro, Kazuo Ohta
2007 C conf
Modeling Agreement Problems in the Universal Composability Framework.
ICICS
Masayuki Terada, Kazuki Yoneyama, Sadayuki Hongo, Kazuo Ohta
2007 — conf
Multiparty Computation for Interval, Equality, and Comparison Without Bit-Decomposition Protocol.
Public Key Cryptography
Takashi Nishide, Kazuo Ohta
2007 A* conf
New Message Difference for MD4.
FSE
Yu Sasaki, Lei Wang, Kazuo Ohta, Noboru Kunihiro
2007 J jnl
Provably Secure Untraceable Electronic Cash against Insider Attacks.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Yoshikazu Hanatani, Yuichi Komano, Kazuo Ohta, Noboru Kunihiro
2007 J jnl
Ring Signatures: Universally Composable Definitions and Constructions.
Inf. Media Technol.
Kazuki Yoneyama, Kazuo Ohta
2007 A conf
Ring signatures: universally composable definitions and constructions.
AsiaCCS
Kazuki Yoneyama, Kazuo Ohta
2007 — conf
Secure Cross-Realm Client-to-Client Password-Based Authenticated Key Exchange Against Undetectable On-Line Dictionary Attacks.
AAECC
Kazuki Yoneyama, Haruki Ota, Kazuo Ohta
2007 J jnl
The quantum fourier transform on a linear nearest neighbor architecture.
Quantum Inf. Comput.
Yasuhiro Takahashi, Noboru Kunihiro, Kazuo Ohta
2007 J jnl
Toward the Fair Anonymous Signatures: Deniable Ring Signatures.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Yuichi Komano, Kazuo Ohta, Atsushi Shimbo, Shin-ichi Kawamura
2007 J jnl
Universally Composable Client-to-Client General Authenticated Key Exchange.
Inf. Media Technol.
Haruki Ota, Kazuki Yoneyama, Shinsaku Kiyomoto, Toshiaki Tanaka, Kazuo Ohta
2007 J jnl
Universally Composable Hierarchical Hybrid Authenticated Key Exchange.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Haruki Ota, Kazuki Yoneyama, Shinsaku Kiyomoto, Toshiaki Tanaka, Kazuo Ohta
2006 — conf
Factorization of Square-Free Integers with High Bits Known.
VIETCRYPT
Bagus Santoso, Noboru Kunihiro, Naoki Kanayama, Kazuo Ohta
2006 J jnl
Forest Structure Dependency of the Relation Between L-Band Sigma
IEEE Trans. Geosci. Remote. Sens.
Manabu Watanabe, Masanobu Shimada, Ake Rosenqvist, Takeo Tadono, Masayuki Matsuoka, Shakil Ahmad Romshoo, Kazuo Ohta, Ryoichi Furuta, Kazuki Nakamura, Toshifumi Moriyama
2006 C conf
Formal Security Model of Multisignatures.
ISC
Yuichi Komano, Kazuo Ohta, Atsushi Shimbo, Shin-ichi Kawamura
2006 J jnl
How to Construct Sufficient Condition in Searching Collisions of MD5.
IACR Cryptol. ePrint Arch.
Yu Sasaki, Yusuke Naito, Jun Yajima, Takeshi Shimoyama, Noboru Kunihiro, Kazuo Ohta
2006 — conf
How to Construct Sufficient Conditions for Hash Functions.
VIETCRYPT
Yu Sasaki, Yusuke Naito, Jun Yajima, Takeshi Shimoyama, Noboru Kunihiro, Kazuo Ohta
2006 A conf
Improved Collision Search for SHA-0.
ASIACRYPT
Yusuke Naito, Yu Sasaki, Takeshi Shimoyama, Jun Yajima, Noboru Kunihiro, Kazuo Ohta
2006 J jnl
Maurer-Yacobi ID-Based Key Distribution Revisited.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Noboru Kunihiro, Wataru Abe, Kazuo Ohta
2006 J jnl
Message Modification for Step 21-23 on SHA-0.
IACR Cryptol. ePrint Arch.
Yusuke Naito, Yu Sasaki, Takeshi Shimoyama, Jun Yajima, Noboru Kunihiro, Kazuo Ohta
2006 A conf
Problems on the MR micropayment schemes.
AsiaCCS
Masahiro Mambo, Moisés Salinas-Rosales, Kazuo Ohta, Noboru Kunihiro
2006 — conf
Provably Secure Electronic Cash Based on Blind Multisignature Schemes.
Financial Cryptography
Yoshikazu Hanatani, Yuichi Komano, Kazuo Ohta, Noboru Kunihiro
2006 J jnl
Taxonomical Security Consideration of OAEP Variants.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Yuichi Komano, Kazuo Ohta
2006 B conf
Toward the Fair Anonymous Signatures: Deniable Ring Signatures.
CT-RSA
Yuichi Komano, Kazuo Ohta, Atsushi Shimbo, Shin-ichi Kawamura
2006 J jnl
Visual Secret Sharing Schemes for Multiple Secret Images Allowing the Rotation of Shares.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Mitsugu Iwamoto, Lei Wang, Kazuki Yoneyama, Noboru Kunihiro, Kazuo Ohta
2005 Misc conf
Analysis on the Clockwise Transposition Routing for Dedicated Factoring Devices.
WISA
Tetsuya Izu, Noboru Kunihiro, Kazuo Ohta, Takeshi Shimoyama
2005 Misc conf
Improved Collision Attack on MD4 with Probability Almost 1.
ICISC
Yusuke Naito, Yu Sasaki, Noboru Kunihiro, Kazuo Ohta
2005 J jnl
Improved Collision Attack on MD4.
IACR Cryptol. ePrint Arch.
Yusuke Naito, Yu Sasaki, Noboru Kunihiro, Kazuo Ohta
2005 J jnl
Improved Collision Attack on MD5.
IACR Cryptol. ePrint Arch.
Yu Sasaki, Yusuke Naito, Noboru Kunihiro, Kazuo Ohta
2005 — conf
On the Security of Probabilistic Multisignature Schemes and Their Optimality.
Mycrypt
Yuichi Komano, Kazuo Ohta, Atsushi Shimbo, Shin-ichi Kawamura
2005 J jnl
Solutions to Security Problems of Rivest and Shamir's PayWord Scheme.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Norio Adachi, Satoshi Aoki, Yuichi Komano, Kazuo Ohta
2004 J jnl
Efficient Universal Padding Schemes for Multiplicative Trapdoor One-way Permutation.
IACR Cryptol. ePrint Arch.
Yuichi Komano, Kazuo Ohta
2004 J jnl
OAEP-ES - Methodology of Universal Padding Technique.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Yuichi Komano, Kazuo Ohta
2004 C conf
Taxonomic Consideration to OAEP Variants and Their Security.
ICICS
Yuichi Komano, Kazuo Ohta
2004 C conf
Tight correlations between forest parameters and backscattering coefficient derived by the L-band airborne SAR (PiSAR).
IGARSS
Manabu Watanabe, Masanobu Shimada, Ake Rosenqvist, Shakil Ahmad Romshoo, Kazuo Ohta, Takeo Tadono, Masayuki Matsuoka, Ryoichi Furuta
2003 J jnl
A Quantum Algorithm Using NMR Computers to Break Secret-Key Cryptosystems.
New Gener. Comput.
Kazuo Ohta, Tetsuo Nishino, Seiya Okubo, Noboru Kunihiro
2003 A* conf
Efficient Universal Padding Techniques for Multiplicative Trapdoor One-Way Permutation.
CRYPTO
Yuichi Komano, Kazuo Ohta
2003 B conf
The Security Problems of Rivest and Shamir's PayWord Scheme.
CEC
Norio Adachi, Yuichi Komano, Satoshi Aoki, Kazuo Ohta
2001 A* conf
Accountable-subgroup multisignatures: extended abstract.
CCS
Silvio Micali, Kazuo Ohta, Leonid Reyzin
1998 B conf
A Strategy for Constructing Fast Round Functions with Practical Security Against Differential and Linear Cryptanalysis.
Selected Areas in Cryptography
Masayuki Kanda, Youichi Takashima, Tsutomu Matsumoto, Kazumaro Aoki, Kazuo Ohta
1998 A ed.
Advances in Cryptology - ASIACRYPT '98, International Conference on the Theory and Applications of Cryptology and Information Security, Beijing, China, October 18-22, 1998, Proceedings
ASIACRYPT
Kazuo Ohta, Dingyi Pei
1998 A* conf
On Concrete Security Treatment of Signatures Derived from Identification.
CRYPTO
Kazuo Ohta, Tatsuaki Okamoto
1997 C conf
On strict estimation method of provable security against differential and linear cryptanalysis.
ICICS
Yasuyoshi Kaneko, Shiho Moriai, Kazuo Ohta
1997 — conf
Remarks on Blind Decryption.
ISW
Kazuo Ohta
1995 A* conf
Improving the Search Algorithm for the Best Linear Expression.
CRYPTO
Kazuo Ohta, Shiho Moriai, Kazumaro Aoki
1994 A* conf
How to Simultaneously Exchange Secrets by General Assumptions.
CCS
Tatsuaki Okamoto, Kazuo Ohta
1994 A* conf
Linear Cryptanalysis of the Fast Data Encipherment Algorithm.
CRYPTO
Kazuo Ohta, Kazumaro Aoki
1993 A* conf
Differential Attack on Message Authentication Codes.
CRYPTO
Kazuo Ohta, Mitsuru Matsui
1992 — conf
A Practical Secret Voting Scheme for Large Scale Elections.
AUSCRYPT
Atsushi Fujioka, Tatsuaki Okamoto, Kazuo Ohta
1992 A* conf
Secure Bit Commitment Function against Divertibility.
EUROCRYPT
Kazuo Ohta, Tatsuaki Okamoto, Atsushi Fujioka
1991 A conf
A Digital Multisignature Scheme Based on the Fiat-Shamir Scheme.
ASIACRYPT
Kazuo Ohta, Tatsuaki Okamoto
1991 A* conf
A Switching Closure Test to Analyze Cryptosystems.
CRYPTO
Hikaru Morita, Kazuo Ohta, Shoji Miyaguchi
1991 A* conf
Direct Zero Knowledge Proofs of Computational Power in Five Rounds.
EUROCRYPT
Tatsuaki Okamoto, David Chaum, Kazuo Ohta
1991 A* conf
Interactive Bi-Proof Systems and Undeniable Signature Schemes.
EUROCRYPT
Atsushi Fujioka, Tatsuaki Okamoto, Kazuo Ohta
1991 A conf
Results of Switching-Closure-Test on FEAL (Extended Abstract).
ASIACRYPT
Hikaru Morita, Kazuo Ohta, Shoji Miyaguchi
1991 A* conf
Universal Electronic Cash.
CRYPTO
Tatsuaki Okamoto, Kazuo Ohta
1990 A* conf
Confirmation that Some Hash Functions Are Not Collision Free.
EUROCRYPT
Shoji Miyaguchi, Kazuo Ohta, Masahiko Iwata
1990 A* conf
How to Utilize the Randomness of Zero-Knowledge Proofs.
CRYPTO
Tatsuaki Okamoto, Kazuo Ohta
1990 J jnl
Identity-based conference key distribution systems.
Syst. Comput. Jpn.
Kenji Koyama, Kazuo Ohta
1990 — conf
Meet-in-the-Middle Attack on Digital Signature Schemes.
AUSCRYPT
Kazuo Ohta, Kenji Koyama
1990 A* conf
Membership Authentication for Hierarchical Multigroups Using the Extended Fiat-Shamir Scheme.
EUROCRYPT
Kazuo Ohta, Tatsuaki Okamoto, Kenji Koyama
1989 A* conf
Disposable Zero-Knowledge Authentications and Their Applications to Untraceable Electronic Cash.
CRYPTO
Tatsuaki Okamoto, Kazuo Ohta
1989 A* conf
Divertible Zero Knowledge Interactive Proofs and Commutative Random Self-Reducibility.
EUROCRYPT
Tatsuaki Okamoto, Kazuo Ohta
1988 A* conf
A Modification of the Fiat-Shamir Scheme.
CRYPTO
Kazuo Ohta, Tatsuaki Okamoto
1988 A* conf
Security of Improved Identity-Based Conference Key Distribution Systems.
EUROCRYPT
Kenji Koyama, Kazuo Ohta
1987 A* conf
Identity-based Conference Key Distribution Systems.
CRYPTO
Kenji Koyama, Kazuo Ohta