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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

Foreword. - Iwamura, Keiichi (IEICE Trans. Inf. Syst., 2019)

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

Anti-counterfeiting Using Irregularities of Magnetic Flux Density. - Kang, Hyunho; Iwamura, Keiichi (2015)

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

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

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

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

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

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

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

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

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

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

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

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

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

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

Proceedings of the 1st international workshop on Information hiding and its criteria for evaluation, IWIHC 2014, Kyoto, Japan, June 3, 2014 (ACM, 2014)

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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