High-Speed Implementation Methods for RSA Scheme. - Keiichi Iwamura; Tsutomu Matsumoto; Hideki Imai (EUROCRYPT, 1992)

Systolic-Arrays for Modular Exponentiation Using Montgomery Method (Extended Abstract). - Keiichi Iwamura; Tsutomu Matsumoto; Hideki Imai (EUROCRYPT, 1992)

A Design of Reed-Solomon Decoder with Systolic Array Structure. - Keiichi Iwamura; Yasunori Dohi; Hideki Imai (IEEE Trans. Computers, 1995)

Development of Benchmark Tool for Digital Watermarking. - Kosuke Kamiya; Takuma Mori; Keiichi Iwamura (IIH-MSP, 2008)

Information Hiding Method Utilizing Low Visible Natural Fiber Pattern for Printed Documents. - Kitahiro Kaneda; Kenji Hirano; Keiichi Iwamura; Seiichiro Hangai (IIH-MSP, 2008)

A Study of Information Hiding Performance Using Simple Dot Pattern with Different Tile Sizes. - Kitahiro Kaneda; Fumiya Nagai; Keiichi Iwamura; Seiichiro Hangai (IIH-MSP, 2008)

A Consideration of the Reliability of Registration and Attribute Exchange. - Yoshio Kakizaki; Keiichi Iwamura (ARES, 2010)

An Improvement of Robustness Against Physical Attacks and Equipment Independence in Information Hiding Based on the Artificial Fiber Pattern. - Kitahiro Kaneda; Yuki Fujii; Keiichi Iwamura; Seiichiro Hangai (ARES, 2010)

A New Fragile Watermarking Scheme and Its Security Evaluation. - Hajime Kubota; Keiichi Iwamura (CCNC, 2010)

Scalable authentication for various representations of JPEG 2000 images. - Masafumi Koide; Keiichi Iwamura (ICIP, 2010)

Fast Implementation of the Advanced Encryption Standard Using Atmega1281. - Kasumi Toriumi; Yoshio Kakizaki; Keiichi Iwamura (ARES, 2011)

Key Management Scheme Applicable to Various Topologies of Sensor Networks. - Hidetoshi Yukimaru; Yoshio Kakizaki; Keiichi Iwamura (ARES, 2011)

Selective Encryption Scheme and Mode to Avoid Generating Marker Codes in JPEG2000 Code Streams with Block Cipher. - Hiroki Ikeda; Keiichi Iwamura (AINA Workshops, 2011)

Information Hiding Based on the Artificial Fiber Pattern with Improved Robustness against Foregound Objects. - Kitahiro Kaneda; Yuta Kito; Keiichi Iwamura (IIH-MSP, 2011)

Information Hiding Based on a Single Dot Pattern Method with Improved Extraction and Robustness against Foreground Objects. - Kitahiro Kaneda; Yoshiaki Tachibana; Keiichi Iwamura (IIH-MSP, 2011)

Identifier Migration in OpenID. - Maeda Kazunari; Yoshio Kakizaki; Keiichi Iwamura (IMIS, 2011)

Identity Continuance in Single Sign-On with Authentication Server Failure. - Yoshio Kakizaki; Maeda Kazunari; Keiichi Iwamura (IMIS, 2011)

A New Tree-structure-specified Multisignature Scheme for a Document Circulation System. - Masaki Inamura; Keiichi Iwamura; Ryu Watanabe; Makoto Nishikawa; Toshiaki Tanaka (SECRYPT, 2011)

Proposal of a watermarking scheme using winding number and unneeded synchronism. - Hiroki Nishikawa; Yoshio Kakizaki; Keiichi Iwamura (ISITA, 2012)

An improvement of insertion/deletion/substitution error correction capabilities of LDPC codes using slide decoding. - Tooru Shigehiro; Hirohisa Yabe; Keiichi Iwamura (ISITA, 2012)

A Method for Resisting Averaging Attacks on Digital Watermarks and Use of This Method with Digital Watermarks. - Hiroki Nishikawa; Shingo Kuse; Keiichi Iwamura; Isao Echizen (NBiS, 2012)

Identifier Migration for Identity Continuance in Single Sign-On. - Yoshio Kakizaki; Maeda Kazunari; Keiichi Iwamura (J. Information Security, 2012)

Experiment of Geometrically Invariant and Unneeded Synchronism Watermarking Using Winding Number. - Hiroki Nishikawa; Yoshio Kakizaki; Keiichi Iwamura; Isao Echizen (AINA Workshops, 2013)

Secret Sharing Scheme Suitable for Cloud Computing. - Satoshi Takahashi; Keiichi Iwamura (AINA, 2013)

A storage-saving secret sharing scheme suitable for sensor networks. - Yoshihide Nagai; Hyunho Kang; Keiichi Iwamura (GCCE, 2013)

Secret sharing scheme for cloud computing using IDs. - Satoshi Takahashi; Shiro Kobayashi; Hyunho Kang; Keiichi Iwamura (GCCE, 2013)

Content Approval Systems with Expansions of a New Pair-Connected-Structured Aggregate Signature Scheme. - Masaki Inamura; Keiichi Iwamura (Int. J. E Entrepreneurship Innov., 2013)

Watermarking based on the difference of discrete cosine transform coefficients and an error-correcting code. - Hyunho Kang; Keiichi Iwamura (IWIHC@AsiaCCS, 2014)

A Zero-Watermarking-Like Steganography and Potential Applications. - Hirokazu Ishizuka; Isao Echizen; Keiichi Iwamura; Kouichi Sakurai (IIH-MSP, 2014)

A New Approach to Reversible Watermarking. - Toshiki Ito; Ryo Sugimura; Hyunho Kang; Keiichi Iwamura; Kitahiro Kaneda; Isao Echizen (IIH-MSP, 2014)

Novel Proposal and Evaluation of Information Extraction Method from Artificial Fiber Pattern Using a Camera. - Kitahiro Kaneda; Tomoki Inui; Keiichi Iwamura; Isao Echizen (IIH-MSP, 2014)

A Study of Equipment Dependence of a Single-Dot Pattern Method for an Information-Hiding by Applying an Error-Correcting Code. - Kitahiro Kaneda; Hiroyasu Kitazawa; Keiichi Iwamura; Isao Echizen (IIH-MSP, 2014)

Mathematical Simulation Model and Its Evaluation for Artificial Fiber Patterns. - Kitahiro Kaneda; Kenta Kawabata; Keiichi Iwamura; Isao Echizen (IIH-MSP, 2014)

Image Protection System with Steganography and Authentication. - Hyunho Kang; Keiichi Iwamura (IIH-MSP, 2014)

Surveillance Camera System to Achieve Privacy Protection and Crime Prevention. - Kento Kobayashi; Keiichi Iwamura; Kitahiro Kaneda; Isao Echizen (IIH-MSP, 2014)

Evaluation of a Zero-Watermarking-Type Steganography. - Hirokazu Ishizuka; Isao Echizen; Keiichi Iwamura; Kouichi Sakurai (IWDW, 2014)

Anti-counterfeiting Using Irregularities of Magnetic Flux Density. - Hyunho Kang; Keiichi Iwamura (CIT/IUCC/DASC/PICom, 2015)

Evaluation of Matching Accuracy of Template Matching Using a Steganography Algorithm. - Hirokazu Ishizuka; Kouichi Sakurai; Isao Echizen; Keiichi Iwamura (CANDAR, 2015)

Surveillance Camera System Balancing Privacy Protection and Effective Surveillance Image Use. - Kent Kobayashi; Masaki Inamura; Kitahiro Kaneda; Keiichi Iwamura; Isao Echizen (ICE-B, 2015)

Content Control Scheme to Realize Right Succession and Edit Control. - Katsuma Koga; Masaki Inamura; Kitahiro Kaneda; Keiichi Iwamura (ICE-B, 2015)

Audio Watermarking Using Different Wavelet Filters. - Toshiki Ito; Hyunho Kang; Keiichi Iwamura; Kitahiro Kaneda; Isao Echizen (IWDW, 2015)

Mosaic-based Privacy-protection with Reversible Watermarking. - Yuichi Kusama; Hyunho Kang; Keiichi Iwamura (SIGMAP, 2015)

Information Hiding Method Using Best DCT and Wavelet Coefficients and ItsWatermark Competition. - Hyunho Kang; Keiichi Iwamura (Entropy, 2015)

Tightly-Secure Identity-Based Structured Aggregate Signature Scheme under the Computational Diffie-Hellman Assumption. - Tomoya Iwasaki; Naoto Yanai; Masaki Inamura; Keiichi Iwamura (AINA, 2016)

Geometric group key-sharing scheme. - Jun Hamasaki; Ryo Kaneko; Keiichi Iwamura (GCCE, 2016)

Proactive secret sharing scheme suitable for asymmetric secret sharing scheme. - Naoto Kaneko; Keiichi Iwamura (GCCE, 2016)

Best embedding direction for spread spectrum-based video watermarking. - Natsuki Kokui; Hyunho Kang; Keiichi Iwamura; Isao Echizen (GCCE, 2016)

Privacy-protected video surveillance in crowded environments using robust watermarking. - Yuichi Kusama; Hyunho Kang; Keiichi Iwamura; Isao Echizen (GCCE, 2016)

Image watermarking using the differences between two wavelet filters. - YuFeng Yan; Hyunho Kang; Keiichi Iwamura; Isao Echizen (GCCE, 2016)

Content Protection Scheme to Realize Edit Control Including Diversion Control and Composition Control. - Tatsuya Fujimoto; Keiichi Iwamura; Masaki Inamura (ICE-B, 2016)

Secrecy Computation without Changing Polynomial Degree in Shamir's (K, N) Secret Sharing Scheme. - Takeshi Shingu; Keiichi Iwamura; Kitahiro Kaneda (DCNET, 2016)

Secret Sharing Scheme and Key Sharing Scheme Suitable for Clustered Sensor Networks. - Shinichi Goto; Keiichi Iwamura; Yuji Suga; Kitahiro Kaneda (WINSYS, 2016)

Security Evaluation on Secret Computation without Changing the Polynomial Degree. - Ken Aoi; Takeshi Shingu; Keiichi Iwamura (AINA Workshops, 2017)

Improvement of Communication Traffic and Security of Proactive Secret Sharing Schemes and Combination Proactive Secret Sharing Scheme with an Asymmetric Secret Sharing Scheme. - Naoto Kaneko; Keiichi Iwamura (AINA Workshops, 2017)

Searchable encryption of image based on secret sharing scheme. - Ahmad Akmal Aminuddin Mohd Kamal; Keiichi Iwamura; Hyunho Kang (APSIPA, 2017)

Geometric group key-sharing scheme using euclidean distance. - Jun Hamasaki; Keiichi Iwamura (CCNC, 2017)

Direct challenge ring oscillator PUF (DC-ROPUF) with novel response selection. - Masataka Ikeda; Hyunho Kang; Keiichi Iwamura (GCCE, 2017)

Deployment of Contents Protection Scheme using Digital Signature. - Daichi Tanaka; Keiichi Iwamura; Masaki Inamura; Kitahiro Kaneda (ICE-B, 2017)

Digital Watermarking Scheme Based on Machine Learning for the IHC Evaluation Criteria. - Ryo Sakuma; Hyunho Kang; Keiichi Iwamura; Isao Echizen (IIH-MSP (1), 2017)

Conditionally Secure Multiparty Computation using Secret Sharing Scheme for n < 2k-1 (Short Paper). - Ahmad Akmal Aminuddin Mohd Kamal; Keiichi Iwamura (PST, 2017)

Conditionally Secure Secrecy Computation using Secret Sharing Scheme for n<2k-1 (full paper). - Ahmad Akmal Aminuddin Mohd Kamal; Keiichi Iwamura (IACR Cryptol. ePrint Arch., 2017)

Information Hiding and Its Criteria for Evaluation. - Keiichi Iwamura; Masaki Kawamura; Minoru Kuribayashi; Motoi Iwata; Hyunho Kang; Seiichi Gohshi; Akira Nishimura (IEICE Trans. Inf. Syst., 2017)

Provably Secure Structured Signature Schemes with Tighter Reductions. - Naoto Yanai; Tomoya Iwasaki; Masaki Inamura; Keiichi Iwamura (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2017)

Detection of Human Motion Gestures Using Machine Learning for Actual Emergency Situations. - Ryohei Niiuchi; Hyunho Kang; Keiichi Iwamura (GCCE, 2018)

New Approach for Embedding Secret Information into Fiber Materials. - Naoya Noguchi; Kitahiro Kaneda; Keiichi Iwamura; Isao Echizen (GCCE, 2018)

Geometric Pairwise Key-Sharing Scheme. - Koki Nishigami; Keiichi Iwamura (SecITC, 2018)

Searchable Encryption Using Secret-Sharing Scheme for Multiple Keyword Search Using Conjunctive and Disjunctive Searching. - Ahmad Akmal Aminuddin Mohd Kamal; Keiichi Iwamura (DASC/PiCom/DataCom/CyberSciTech, 2019)

Secret Verification Method Suitable for the Asymmetric Secret Sharing Scheme. - Takato Imai; Keiichi Iwamura (ICETE (1), 2019)

Content Protection Method to Control Editing by Billing. - Tomohiro Kobayashi; Keiichi Iwamura; Masaki Inamura (ICETE (1), 2019)

Efficient Geometric Group Key-sharing Scheme. - Koki Nishigami; Keiichi Iwamura (ICETE (1), 2019)

Implementation of a Digital Signature in Backward-Compatible QR Codes Using Subcell Division and Double Encoding. - Nobuyuki Teraura; Isao Echizen; Keiichi Iwamura (IMIS, 2019)

Fast Secrecy Computation with Multiplication Under the Setting of $k le N<2k-1$ using Secret Sharing Scheme. - Keiichi Iwamura; Ahmad Akmal Aminuddin Mohd Kamal (IACR Cryptol. ePrint Arch., 2019)

Secure Pairwise Key Sharing using Geometric Group Key Sharing Method (Full Paper). - Shogo Ochiai; Keiichi Iwamura; Ahmad Akmal Aminuddin Mohd Kamal (IACR Cryptol. ePrint Arch., 2019)

Detecting Discrete Cosine Transform-Based Digital Watermarking Insertion Area Using Deep Learning. - Sayoko Kakikura; Hyunho Kang; Keiichi Iwamura; Naoto Kawamura (AICCC, 2020)

Video Tampering Detection based on High-Frequency Features using Machine Learning. - Hiroki Ueda; Hyunho Kang; Keiichi Iwamura (AICCC, 2020)

A QR Symbol with ECDSA for Both Public and Secret Areas using Rhombic Sub-cells. - Nobuyuki Teraura; Isao Echizen; Keiichi Iwamura (APSIPA, 2020)

Secure Pairwise Key Sharing using Geometric Group Key Sharing Method. - Shogo Ochiai; Keiichi Iwamura; Ahmad Akmal Aminuddin Mohd Kamal (CCNC, 2020)

An AODV-Based Communication-Efficient Secure Routing Protocol for Large Scale Ad-Hoc Networks. - Yuma Shibasaki; Koya Sato; Keiichi Iwamura (CCNC, 2020)

Secure and Efficient Outsourcing of Matrix Multiplication based on Secret Sharing Scheme using only One Server. - Masashi Yamane; Keiichi Iwamura (CCNC, 2020)

Data Augmentation For Deep Learning Using Generative Adversarial Networks. - Daiki Yorioka; Hyunho Kang; Keiichi Iwamura (GCCE, 2020)

New Approach to Dishonest-Majority Secure Multiparty Computation for Malicious Adversaries when n < 2k - 1. - Shogo Ochiai; Keiichi Iwamura (CANDAR (Workshops), 2020)

A Content Protection Method That Allows Commissioning of Editing Control Processing to a Third Party using a Proxy Signature. - Tomohiro Kobayashi; Keiichi Iwamura; Masaki Inamura (ICETE (3), 2020)

Secure Comparison and Interval Test Protocols based on Three-party MPC. - Wataru Fujii; Keiichi Iwamura; Masaki Inamura (ICISSP, 2020)

Implementation of Digital Signature on QR Symbol by Area Division Using Rhombic Sub-cells. - Nobuyuki Teraura; Isao Echizen; Keiichi Iwamura (IMIS, 2020)

Foreword. - Keiichi Iwamura (IEICE Trans. Inf. Syst., 2020)

A Supply Chain Management System to Prevent Counterfeiting and Trace Different Transactions Instead of using PUF Device. - Yusuke Abe; Kosei Arisaka; Kitahiro Kaneda; Keiichi Iwamura (ICE-B, 2021)

Improvement of Secure Multi-Party Multiplication of (k, n) Threshold Secret Sharing Using Only N = k Servers. - Ahmad Akmal Aminuddin Mohd Kamal; Keiichi Iwamura (ICISSP, 2021)

Implementation of Secondary Available Digital Content Protection Schemes using Identity-based Signatures. - Nozomi Nagashima; Masaki Inamura; Keiichi Iwamura (ICISSP, 2021)

Secure Computation by Secret Sharing using Input Encrypted with Random Number. - Keiichi Iwamura; Ahmad Akmal Aminuddin Mohd Kamal (SECRYPT, 2021)

High-speed Retrieval and Authenticity Judgment using Unclonable Printed Code. - Kazuaki Sugai; Kitahiro Kaneda; Keiichi Iwamura (SIGMAP, 2021)

(Server-Aided) Two-Party Multiplication of Encrypted Shares Using (k, n) Threshold Secret Sharing With N ≥ k Servers. - Ahmad Akmal Aminuddin Mohd Kamal; Keiichi Iwamura (IEEE Access, 2021)

Secure Computation by Secret Sharing Using Input Encrypted with Random Number (Full Paper). - Keiichi Iwamura; Ahmad Akmal Aminuddin Mohd Kamal (IACR Cryptol. ePrint Arch., 2021)

Improvement of Secure Multi-Party Multiplication of (k, n) Threshold Secret Sharing Using Only N=k Servers (Revised Version). - Ahmad Akmal Aminuddin Mohd Kamal; Keiichi Iwamura (IACR Cryptol. ePrint Arch., 2021)

Searchable encryption using secret sharing scheme that realizes direct search of encrypted documents and disjunctive search of multiple keywords. - Ahmad Akmal Aminuddin Mohd Kamal; Keiichi Iwamura (J. Inf. Secur. Appl., 2021)

TTP-Aided Secure Computation using Secret Sharing With Only One Computing Server. - Keiichi Iwamura; Ahmad Akmal Aminuddin Mohd Kamal; Masaki Inamura (AsiaCCS, 2022)

Performance of Federated Learning with Local Differential Privacy: Federation or Individualƒ. - Yuta Kakizaki; Koya Sato; Keiichi Iwamura (CCNC, 2022)

A Decentralized Machine Learning Scheme with Input Perturbation-Based Differential Privacy. - Masakazu Okamoto; Koya Sato; Keiichi Iwamura (CCNC, 2022)

Round Color 2D Symbol with Display Area and Secret Data Area for Business-to-Consumer Applications. - Nobuyuki Teraura; Isao Echizen; Keiichi Iwamura (GCCE, 2022)

Proposal and Evaluation of a Method for Secure Division Sum Using the Secret Sharing Scheme by Rounding Off Real Numbers. - Yunosuke Noso; Keiichi Iwamura; Masaki Inamura (CANDARW, 2022)

Print to Scan Resistant Watermarking based on Green Noise Diffusion Method using Machine Learning. - Yoshi Michael Cho; Hiroyuki Imada; Naoto Kawamura; Hyunho Kang; Keiichi Iwamura (ICACT, 2022)

Collusion Resistant Watermarking for Deep Learning Models Protection. - Sayoko Kakikura; Hyunho Kang; Keiichi Iwamura (ICACT, 2022)

Improvement of Privacy Prevented Person Tracking System using Artificial Fiber Pattern. - Hiroki Urakawa; Kitahiro Kaneda; Keiichi Iwamura (SIGMAP, 2022)

Simple Approach to Realizing Verifiable Secret Sharing for Secure Cloud System. - Keiichi Iwamura; Ahmad Akmal Aminuddin Mohd Kamal (IEEE Access, 2022)

TTP-Aided Secure Computation Using (k, n) Threshold Secret Sharing With a Single Computing Server. - Keiichi Iwamura; Ahmad Akmal Aminuddin Mohd Kamal (IEEE Access, 2022)

A Communication-Efficient Secure Routing Protocol for IoT Networks. - Yuma Shibasaki; Keiichi Iwamura; Koya Sato (Sensors, 2022)

TTP-Aided Searchable Encryption of Documents Using Threshold Secret Sharing. - Ahmad Akmal Aminuddin Mohd Kamal; Keiichi Iwamura (ICISSP, 2023)

Communication-Efficient Secure Computation of Encrypted Inputs Using (k, n) Threshold Secret Sharing. - Keiichi Iwamura; Ahmad Akmal Aminuddin Mohd Kamal (IEEE Access, 2023)

Privacy preserving multi-party multiplication of polynomials based on (k,n) threshold secret sharing. - Ahmad Akmal Aminuddin Mohd Kamal; Keiichi Iwamura (ICT Express, 2023)

Secure User Authentication With Information Theoretic Security Using Secret Sharing-Based Secure Computation. - Keiichi Iwamura; Ahmad Akmal Aminuddin Mohd Kamal (IEEE Access, 2025)

Improving the security of asymmetric secret sharing scheme and its new applications. - Keiichi Iwamura; Ahmad Akmal Aminuddin Mohd Kamal (J. Inf. Secur. Appl., 2025)