Koga Hiroki 古賀弘樹

… Alternative Names

KOGA Hiroki 古賀弘樹

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Researcher Number	20272388
Other IDs
Affiliation (Current)	2025: 筑波大学, システム情報系, 教授
Affiliation (based on the past Project Information) *help	2018 – 2023: 筑波大学, システム情報系, 教授 2015 – 2016: 筑波大学, システム情報系, 教授 2011 – 2014: 筑波大学, システム情報系, 准教授 2007 – 2010: University of Tsukuba, 大学院・システム情報工学研究科, 准教授 2006: 筑波大学, 大学院システム情報工学研究科, 助教授 … More 2004 – 2005: 筑波大学, 大学院・システム情報工学研究科, 助教授 2003: 筑波大学, 機能工学系, 助教授 1999 – 2002: 筑波大学, 機能工学系, 講師 1995 – 1998: 東京大学, 大学院・工学系研究科, 助手 Less
Review Section/Research Field	Principal Investigator Fundamental theory of informatics / 情報通信工学 / Basic Section 60010:Theory of informatics-related / Theory of informatics Except Principal Investigator 情報通信工学 / 計測・制御工学 / Basic Section 12030:Basic mathematics-related / Communication/Network engineering
Keywords	Principal Investigator 符号化定理 / 秘密分散法 / 秘密鍵暗号 / 結託耐性符号 / 不正者特定 / 電子指紋符号 / 視覚暗号 / 一般情報源 / 容量公式 / 電子透かし … More / コンテンツ保護 / 情報理論 / (k,n)しきい値法 / 視覚復号型秘密分散法 / 情報スペクトル / 情報源符号化 / しきい値法 / 離散フーリエ変換 / 同時容量 / インタリーブ攻撃 / 結託体制符号 / 情報セキュリティ / 容量 / 著作権保護 / 電子指紋 / 確率的符号器 / 情報理論的安全性 / 情報理論的暗号理論 / (k, n)しきい値法 / 視覚複号型秘密分散法 / コントラスト最適化 / 乱数生成 / シャノン理論 / 同音異義符号化 / 一様乱数 / シャノンの暗号システム / 機密保持通信 / 秘密分散 / 認証符号 … More Except Principal Investigator 情報源符号化定理 / 多端子情報理論 / ロボット / inciedence matrix / multi-access / locally reparable code / multi-acces channel / BCH code / AMD code / multi-access channel / locally recoverable code / all-or-nothing transform / PIR scheme / aulti-access channel / group testing / differential privacy / locally repairable code / list decoding / fingerprinting / sparse / incidence matrix / アルゴリズム / 構成法 / 分散ストレージシステム / 多元接続通信 / 検査計画 / デジタル指紋 / 結合行列 / スパース / two-way channel / Slepian-Wolf system / multi-terminal information theory / Shannon theory / source coding theorem / Slepian-Wolfシステム / 双方向通信システム / Slepiun-Wolfシステム / シャノン理論 / Hyper-stable Block / Impedance Matching / Friction-free Robot / Gravity / Inertia-only Robot / Nonlinear Circuit / Impedance Control / Mechanical System / Robot / インピーダンス・マッチンング / 超安定ブロック / インピーダンス・マッチング / 慣性法則ロボット / 摩擦フリーロボット / 重力 / 非線形回路 / インピーダンス制御 / 機械系 / 情報セキュリティ / 反辞書法 / Move-To-Front法 / 多分木 / スプレイ / 木符号 / 乱数検定 / T-code / 放送型暗号 / Complexity / T-Code / 暗号システム / データ圧縮 / 同期系列 / 一般情報源 / FV 符号 / 符号木 / 共通情報量 / レイトひずみ理論 / 多端子通信システム / 三角形型通信システム / ロボットハンド / ロボットの腕 / 非線形制御 / 受動性 / インピーダンス概念 / 手先技量 / 非線形回路理論 Less

Mathematical analyses on one-bit secret sharing schemes and their extensionsPrincipal Investigator
- Principal Investigator
  
  古賀弘樹
- Project Period (FY)
  2023 – 2025
- Research Category
  
  Grant-in-Aid for Scientific Research (C)
- Review Section
  
  Basic Section 60010:Theory of informatics-related
- Research Institution
  University of Tsukuba
Construction of a Robust Algorithm for Identification of All Malicious Users of a Digital Fingerprinting Code and Characterization of the Joint CapacityPrincipal Investigator
- Principal Investigator
  
  Koga Hiroki
- Project Period (FY)
  2018 – 2021
- Research Category
  
  Grant-in-Aid for Scientific Research (C)
- Review Section
  
  Basic Section 60010:Theory of informatics-related
- Research Institution
  University of Tsukuba
Analysis and Construction of Combinatorial Structures with Sparse Incidence Matrices
- Principal Investigator
  
  Miao Ying
- Project Period (FY)
  2018 – 2022
- Research Category
  
  Grant-in-Aid for Scientific Research (B)
- Review Section
  
  Basic Section 12030:Basic mathematics-related
- Research Institution
  University of Tsukuba
Developments of the Capacity Formula and Identification Algorithms for a Catch-All Digital Fingerprinting CodePrincipal Investigator
- Principal Investigator
  
  KOGA Hiroki
- Project Period (FY)
  2014 – 2016
- Research Category
  
  Grant-in-Aid for Scientific Research (C)
- Research Field
  
  Theory of informatics
- Research Institution
  University of Tsukuba
Construction and Performance Analysis of Digital Fingerprinting Code with Identifiability of All Malicious UsersPrincipal Investigator
- Principal Investigator
  
  KOGA Hiroki
- Project Period (FY)
  2011 – 2013
- Research Category
  
  Grant-in-Aid for Scientific Research (C)
- Research Field
  
  Fundamental theory of informatics
- Research Institution
  University of Tsukuba
Coding Theorems for Information-Theoretically Secure Systems with Stochastic EncodersPrincipal Investigator
- Principal Investigator
  
  KOGA Hiroki
- Project Period (FY)
  2008 – 2010
- Research Category
  
  Grant-in-Aid for Scientific Research (C)
- Research Field
  
  Fundamental theory of informatics
- Research Institution
  University of Tsukuba
Analysis of Coding Tree Characteristics and its Applications to Data Compression and Cryptosystems
- Principal Investigator
  
  YAMAMOTO Hirosuke
- Project Period (FY)
  2005 – 2008
- Research Category
  
  Grant-in-Aid for Scientific Research (B)
- Research Field
  
  Communication/Network engineering
- Research Institution
  The University of Tokyo
計算量的に効率のよい秘密分散法の実現に関する研究Principal Investigator
- Principal Investigator
  
  古賀弘樹
- Project Period (FY)
  2005 – 2007
- Research Category
  
  Grant-in-Aid for Young Scientists (B)
- Research Field
  
  Fundamental theory of informatics
- Research Institution
  University of Tsukuba
最適性をもつ視覚復号型秘密分散法の代数的な構成法に関する研究Principal Investigator
- Principal Investigator
  
  古賀弘樹
- Project Period (FY)
  2003 – 2004
- Research Category
  
  Grant-in-Aid for Young Scientists (B)
- Research Field
  
  Fundamental theory of informatics
- Research Institution
  University of Tsukuba
一般情報源を一様乱数に変換する方法およびその暗号への適用に関する研究Principal Investigator
- Principal Investigator
  
  古賀弘樹
- Project Period (FY)
  2001 – 2002
- Research Category
  
  Grant-in-Aid for Young Scientists (B)
- Research Field
  
  情報通信工学
- Research Institution
  University of Tsukuba
一般情報源をもつシャノンの暗号システムに対する符号化定理に関する研究Principal Investigator
- Principal Investigator
  
  古賀弘樹
- Project Period (FY)
  1999 – 2000
- Research Category
  
  Grant-in-Aid for Encouragement of Young Scientists (A)
- Research Field
  
  情報通信工学
- Research Institution
  University of Tsukuba
秘密鍵暗号系に基づく認証システムに関する符号化定理Principal Investigator
- Principal Investigator
  
  古賀弘樹
- Project Period (FY)
  1997 – 1998
- Research Category
  
  Grant-in-Aid for Encouragement of Young Scientists (A)
- Research Field
  
  情報通信工学
- Research Institution
  The University of Tokyo
Research on source coding theorems for a multi-terminal communication system with a two-way channel
- Principal Investigator
  
  YAMAMOTO Hirosuke
- Project Period (FY)
  1997 – 1998
- Research Category
  
  Grant-in-Aid for Scientific Research (C)
- Research Field
  
  情報通信工学
- Research Institution
  The University of Tokyo
三角形型通信システムに対するレイトひずみ理論に関する研究
- Principal Investigator
  
  YAMAMOTO Hirosuke
- Project Period (FY)
  1996
- Research Category
  
  Grant-in-Aid for Scientific Research (C)
- Research Field
  
  情報通信工学
- Research Institution
  The University of Tokyo
Control of Advanced Mechatronics Systems by Means of Nonlinear Circuit Theory
- Principal Investigator
  
  ARIMOTO Suguru
- Project Period (FY)
  1996
- Research Category
  
  Grant-in-Aid for Scientific Research (B)
- Research Field
  
  計測・制御工学
- Research Institution
  University of Tokyo
非線形回路理論の展開による手先技量の力学的理解と制御
- Principal Investigator
  
  ARIMOTO Suguru
- Project Period (FY)
  1995
- Research Category
  
  Grant-in-Aid for General Scientific Research (B)
- Research Field
  
  計測・制御工学
- Research Institution
  The University of Tokyo

[Journal Article] 視覚暗号の最近の進歩2023
- Author(s)
  古賀弘樹
- Journal Title
  
  電子情報通信学会学会誌/
  
  Volume: 106(1) Pages: 39-46
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-18H01133
[Journal Article] Optimal Basis Matrices of a Visual Cryptography Scheme with Meaningful Shares and Analysis of Its Security2021
- Author(s)
  K. Sekine and H. Koga
- Journal Title
  
  IEICE Trans. Fundamentals
  
  Volume: E104.A Issue: 9 Pages: 1235-1244
- DOI
  10.1587/transfun.2020DMP0010
- NAID
  130008081883
- ISSN
  0916-8508, 1745-1337
- Year and Date
  2021-09-01
- Language
  English
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-18K11151, KAKENHI-PROJECT-18H01133
[Journal Article] Coding Theorems on Digital Fingerprinting Coding under Informed and Uninformed Setups2021
- Author(s)
  Hiroki Koga
- Journal Title
  
  Proceedings of 2021 IEEE Information Theory Workshop (ITW 2021)
  
  Pages: 1-6
- DOI
  10.1109/itw48936.2021.9611451
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-18K11151
[Journal Article] Coding Theorems on the Simple Capacity for Digital Fingerprinting Codes2020
- Author(s)
  Hiroki Koga
- Journal Title
  
  IEICE Proceeding Series
  
  Volume: 65 Pages: 61-65
- DOI
  10.34385/proc.65.A01-13
- NAID
  230000012551
- ISSN
  2188-5079
- Year and Date
  2020-10-18
- Language
  English
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-18K11151
[Journal Article] An Ideal Secret Sharing Scheme Realizing an Access Structure Based on a Finite Projective Plane of Order 32020
- Author(s)
  Yohei Ookawa and Hiroki Koga
- Journal Title
  
  Proceedings of 2020 International Symposium on Information Theory
  
  Pages: 852-857
- DOI
  10.1109/isit44484.2020.9174121
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-18K11151
[Journal Article] A Lower Bound on the Joint Capacity of Digital Fingerprinting Codes Using Score Functions Based on Log-Likelihood Ratio2018
- Author(s)
  Hiroki Koga
- Journal Title
  
  Proceedings of 2018 IEEE International Symposium on Information Theory
  
  Pages: 1136-1140
- DOI
  10.1109/isit.2018.8437922
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-18K11151
[Journal Article] New Fundamental Properties on a Secret-key Cryptosystem under Guessing Secrecy Criteria2016
- Author(s)
  Shota Kamiya and Hiroki Koga
- Journal Title
  
  Proceedings of 2016 Information Theory and its Applications
  
  Volume: -
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-26330003
[Journal Article] A Higher Order Analysis of the Joint Capacity of Digital FIngerprinting Codes against the Interleaving Attack2016
- Author(s)
  Hiroki Koga and Kaoru Itabashi
- Journal Title
  
  Proceedings of the 4th ACM Workshop on Information Hiding and Multimedia Security
  
  Volume: - Pages: 23-28
- DOI
  10.1145/2909827.2930788
- Peer Reviewed / Acknowledgement Compliant
- Data Source
  KAKENHI-PROJECT-26330003
[Journal Article] A Higher Order Analysis of the Joint Capacity of Digital Fingerprinting Codes against the Interleaving Attack2016
- Author(s)
  Hiroki Koga and Kaoru Itabashi
- Journal Title
  
  Proceedings of ACM Workshop on Information Hiding and Multimedia Security
  
  Volume: --
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-26330003
[Journal Article] On a Partition of a Finite Set and its Relationships to Encoding Tasks and the Renyi Entropy2015
- Author(s)
  Hiroki Koga
- Journal Title
  
  Proceedings of 2015 IEEE International Symposium on Information Theory
  
  Volume: -- Pages: 1452-1456
- DOI
  10.1109/isit.2015.7282696
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-26330003
[Journal Article] On the capacity and the zero-error capacity of k-resilient AND anti-collusion codes2014
- Author(s)
  Hiroki Koga
- Journal Title
  
  2014 IEEE Information Theory Workshop
  
  Volume: 1 Pages: 177-181
- DOI
  10.1109/itw.2014.6970816
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-26330003
[Journal Article] Characterization of the Smooth Renyi Entropy Using Majorization2013
- Author(s)
  H. Koga
- Journal Title
  
  Proc. 2013 IEEE Information Theory Workshop
  
  Pages: 604-608
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-23500004
[Journal Article] Characterization of the Smooth Renyi Entropy Using Majorization2013
- Author(s)
  Hiroki Koga
- Journal Title
  
  Proceedings of 2013 IEEE Information Theory Workshop
  
  Volume: なし Pages: 1-5
- DOI
  10.1109/itw.2013.6691332
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-23500004
[Journal Article] On the Role of Mutual Information between the Shares in a Robust Secret Sharing Scheme2012
- Author(s)
  H. Koga and K. Koyano
- Journal Title
  
  Proc. 2012 International Symposium on Information Theory
  
  Pages: 260-265
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-23500004
[Journal Article] On the Role of Mutual Information between the Shares in a Robust Secret Sharing Scheme2012
- Author(s)
  H. Koga and K. Koyano
- Journal Title
  
  Proc. 2012 International Symposium on Information Theory and its Applications
  
  Volume: DVD
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-23500004
[Journal Article] A Digital Fingerprinting Code Based on a Projective Plane with Identifiability of All Malicious Users2011
- Author(s)
  Hiroki Koga, Yusuke Minami
- Journal Title
  
  IECIE Trans. Fundamentals vol.E94-A
  
  Pages: 223-232
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-20500004
[Journal Article] A Digital Fingerprinting Code Based on a Projective Plane with Identifi ability of All Malicious Users2011
- Author(s)
  Hiroki Koga, Yusuke Minami
- Journal Title
  
  IEICE Trans.on Fundamentals.
  
  Volume: E94-A Pages: 223-232
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-20500004
[Journal Article] Four Limits in Probability and Their Roles in Source Coding2011
- Author(s)
  Hiroki Koga
- Journal Title
  
  IEICE Trans. Fundamentals
  
  Volume: E94-A Issue: 11 Pages: 2073-2082
- DOI
  10.1587/transfun.E94.A.2073
- NAID
  10030191410
- ISSN
  0916-8508, 1745-1337
- Language
  English
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-23500004
[Journal Article] A Simple Secret Sharing Scheme Using a Key and its Security against Substitution of Shares2010
- Author(s)
  Hiroki Koga
- Journal Title
  
  Proc.2010 IEEE International Symposium on Information Theory
  
  Volume: CD-ROM Pages: 2483-2487
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-20500004
[Journal Article] Two Generalizations of a Coding Theorem for a (2, 2)-Threshold Scheme with a Cheater2010
- Author(s)
  Hiroki Koga
- Journal Title
  
  Proc.2010 International Symposium on Information Theory and its Applications
  
  Volume: CD-ROM Pages: 678-683
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-20500004
[Journal Article] Two Generalizations of a Coding Theorem for a (2,2)-Threshold Scheme with a Cheater2010
- Author(s)
  Hiroki Koga
- Journal Title
  
  Proc.2010 International Symposium on Information Theory and its Applications, Taichung
  
  Pages: 678-683
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-20500004
[Journal Article] A Simple Secret Sharing Scheme Using a Key and its Security against Substitution of Shares2010
- Author(s)
  Hiroki Koga
- Journal Title
  
  Proc.International Symposium on Information Theory Austin
  
  Pages: 2483-2487
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-20500004
[Journal Article] New Coding Theorems for Fixed-Length Source Coding and Shannon's Cipher System with a General Source2008
- Author(s)
  Hiroki Koga
- Journal Title
  
  Proc. International Symposium on Information Theory and its Applications
  
  Pages: 251-256
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-20500004
[Journal Article] Coding Theoremson the Threshold Scheme for a General Source2008
- Author(s)
  Hiroki koga
- Journal Title
  
  IEEE Transactions on Information Theony vol.54,n06(To appear)
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-17700005
[Journal Article] New Coding Theorems for Fixed-Length Source Coding and Shannon's Cipher System with a General Source2008
- Author(s)
  Hiroki Koga
- Journal Title
  
  Proc.International Symposium on Information Theory and its Applications Auckland
  
  Pages: 251-256
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-20500004
[Journal Article] Basic Properties of Complete Complementary Codes Using the DFT Matrices and Kronecker Products2008
- Author(s)
  Yi Jin and Hiroki Koga
- Journal Title
  
  Proc. International Symposium on Information Theory and its Applications
  
  Pages: 887-892
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-20500004
[Journal Article] Basic Properties of Complete Complementary Codes Using the DFT Matrices and Kronecker Products2008
- Author(s)
  Yi Jin, Hiroki Koga
- Journal Title
  
  Pro.International Symposium on Information Theory and its Applications Auckland
  
  Pages: 887-892
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-20500004
[Journal Article] Proposal of an Asyrptotically Contrast-Ideal (t_rn)-Threshold Visual Secret Sharing Scheme2006
- Author(s)
  H.Koga, E.Veda
- Journal Title
  
  Proc.2006 IEEE International Symposium on Information Theory
  
  Pages: 912-916
- Data Source
  KAKENHI-PROJECT-17700005
[Journal Article] Baste Properties of the(tu)-Threshold Visual : Secret sharing, Scheme with Perfect Recorstruction of Black Pixels2006
- Author(s)
  H.Koga, E.Veda
- Journal Title
  
  Desigus, Codes, and Cryptography vol.40,no.2
  
  Pages: 81-102
- Data Source
  KAKENHI-PROJECT-17700005
[Journal Article] Asymptotic properties on the codeword lengths of optimal FV cods for general sources2005
- Author(s)
  H. Koga, H. Yamamoto
- Journal Title
  
  IEICE Transactions on Fundamentals vol.51, no.4
  
  Pages: 1546-1555
- Peer Reviewed
- Data Source
  KAKENHI-PROJECT-17360174
[Journal Article] Goding Theorems on the Threshold Schome for a General Source2005
- Author(s)
  Hiroki Koga
- Journal Title
  
  Proc.2005 IEEE Information Theory Workshop on Theory and Practice in Information-Theoretic Cryptography
  
  Pages: 67-72
- Data Source
  KAKENHI-PROJECT-17700005
[Journal Article] On an Upper Bound of the Secrecy Capacits for a General Wiretop Channel2005
- Author(s)
  Hiroki Koga, Naoki Sato
- Journal Title
  
  Proc.2005 IEEE International Symposium on Information Theory
  
  Pages: 1641-1645
- Data Source
  KAKENHI-PROJECT-17700005
[Journal Article] Coding theorems on Secret Sharing Schemes for a General Source with the Strong Converse Proputy2004
- Author(s)
  H.Koga, T.Ooishi
- Journal Title
  
  Proc.of 2004 International Symposium an Information Theory and Its Applications
  
  Pages: 1104-1109
- Data Source
  KAKENHI-PROJECT-15700006
[Journal Article] The Optimal (t,n)-Threshold Visual Secret Sharing Scheme with Perfect Reconstruction of Black Pixels2004
- Author(s)
  H.Koga, E.Ueda
- Journal Title
  
  Proc.of 4-th Asian-European Workshop or Information Theory
  
  Pages: 45-48
- NAID
  10014281283
- Data Source
  KAKENHI-PROJECT-15700006
[Presentation] 1ビットの秘密情報に対するしきい値型秘密分散法の構成とその離散フーリエ変換を用いた安全性解析2024
- Author(s)
  柿島拓斗，古賀弘樹
- Organizer
  電子情報通信学会　情報理論研究会
- Data Source
  KAKENHI-PROJECT-23K10979
[Presentation] 異なるサイズのキャッシュメモリをもつ符号化キャッシュ方式の達成可能レートについて2024
- Author(s)
  永谷亮人，古賀弘樹
- Organizer
  電子情報通信学会　情報理論研究会
- Data Source
  KAKENHI-PROJECT-23K10979
[Presentation] On the Optimal Relative Difference of Superimposed All the Shares for a (t, n)-Threshold Visual Cryptography Scheme (Recent Result Session)2023
- Author(s)
  Hiroki Koga
- Organizer
  2023 IEEE International Symposium on Information Theory
- Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-23K10979
[Presentation] 複数のアクセス構造をもつ最適な視覚暗号の構成について2022
- Author(s)
  五百木来樹，古賀弘樹
- Organizer
  電子情報通信学会情報理論研究会
- Data Source
  KAKENHI-PROJECT-18H01133
[Presentation] シェアの回転により複数の秘密画像を復元できる視覚暗号の最適な構成法2021
- Author(s)
  関根恭平，古賀弘樹
- Organizer
  電子情報通信学会情報理論研究会
- Data Source
  KAKENHI-PROJECT-18H01133
[Presentation] 1ビットの秘密情報に対する秘密分散法に同値な条件とその拡張2021
- Author(s)
  岡村亮，古賀弘樹
- Organizer
  電子情報通信学会　情報理論研究会
- Data Source
  KAKENHI-PROJECT-18K11151
[Presentation] Coding theorems on the simple capacity for digital fingerprinting codes2020
- Author(s)
  H. Koga
- Organizer
  2020 International Symposium on Information Theory and Its Applications (ISITA 2020)
- Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-18H01133
[Presentation] Optimal basis matrices of a visual cryptography scheme with meaningful shares and analysis of its security2020
- Author(s)
  K. Sekine, H. Koga
- Organizer
  2020 International Symposium on Information Theory and Its Applications (ISITA 2020)
- Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-18H01133
[Presentation] New constructions of an evolving 2-threshold scheme based on binary or D-ary prefix codes2020
- Author(s)
  R. Okamura, H. Koga
- Organizer
  2020 International Symposium on Information Theory and Its Applications (ISITA 2020)
- Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-18H01133
[Presentation] An ideal secret sharing scheme realizing an access structure based on a finite projective plane of order 32020
- Author(s)
  Y. Okawa, H. Koga
- Organizer
  2020 IEEE International Symposium on Information Theory (ISIT2020)
- Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-18H01133
[Presentation] あるEvolving型アクセス構造のクラスに対する秘密分散法の最適性について2019
- Author(s)
  古賀弘樹
- Organizer
  第41回情報理論とその応用シンポジウム
- Data Source
  KAKENHI-PROJECT-18H01133
[Presentation] 参加者が多いいくつかのアクセス構造に対する秘密分散法の最悪情報レートについて2019
- Author(s)
  久留嵩史，古賀弘樹
- Organizer
  電子情報通信学会　情報理論研究会 IT2018-120
- Data Source
  KAKENHI-PROJECT-18H01133
[Presentation] 電子指紋符号の同時ユニバーサル容量の下界の導出2019
- Author(s)
  古賀弘樹
- Organizer
  第11回シャノン理論ワーウショップ
- Data Source
  KAKENHI-PROJECT-18K11151
[Presentation] 電子指紋符号の単純容量に関する符号化定理2019
- Author(s)
  古賀弘樹
- Organizer
  電子情報通信学会情報理論研究会
- Data Source
  KAKENHI-PROJECT-18K11151
[Presentation] 拡張型視覚暗号における整数計画法を用いた最適な基本行列の構成2019
- Author(s)
  関根恭平, 古賀弘樹
- Organizer
  第42回情報理論とその応用シンポジウム2019
- Data Source
  KAKENHI-PROJECT-18H01133
[Presentation] 位数３の有限射影平面に基づくアクセス構造に対する理想的な秘密分散法2019
- Author(s)
  大川耀平, 古賀弘樹
- Organizer
  第42回情報理論とその応用シンポジウム2019
- Data Source
  KAKENHI-PROJECT-18H01133
[Presentation] A construction of the (4,n)-threshold visual cryptography using a 3-design2018
- Author(s)
  Koutaro Okada, Hiroki Koga
- Organizer
  The 2018 International Symposium on Information Theory and Its Applications (ISITA2018)
- Data Source
  KAKENHI-PROJECT-18H01133
[Presentation] 混合型の攻撃に対する電子指紋符号の同時容量の評価2018
- Author(s)
  關根達也，古賀弘樹
- Organizer
  電子情報通信学会情報理論研究会
- Data Source
  KAKENHI-PROJECT-18K11151
[Presentation] A construction of secret sharing schemes with threshold 3 for countably infinite participants2018
- Author(s)
  Takashi Hisatome, Hiroki Koga
- Organizer
  The 2018 International Symposium on Information Theory and Its Applications (ISITA2018)
- Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-18H01133
[Presentation] インタリーブ攻撃に対する電子指紋符号の同時容量の評価2016
- Author(s)
  古賀弘樹，板橋薫
- Organizer
  電子情報通信学会情報理論研究会
- Place of Presentation
  電気通信大学（東京都調布市）
- Year and Date
  2016-03-10
- Data Source
  KAKENHI-PROJECT-26330003
[Presentation] 連続分布に基づき符号語が生成される電子指紋符号の容量の下界について2015
- Author(s)
  古賀弘樹，板橋薫
- Organizer
  電子情報通信学会情報理論研究会
- Place of Presentation
  京都国際交流会館（京都府京都市）
- Year and Date
  2015-05-21
- Data Source
  KAKENHI-PROJECT-26330003
[Presentation] 定常性を仮定しない確率的な電子指紋符号の性能に関する一考察2014
- Author(s)
  金井紘平，古賀弘樹
- Organizer
  電子情報通信学会
- Place of Presentation
  名古屋大学
- Data Source
  KAKENHI-PROJECT-23500004
[Presentation] 定常性を仮定しない確率的な電子指紋符号の性能に関する一考察2014
- Author(s)
  金井紘平, 古賀弘樹
- Organizer
  電子情報通信学会情報理論研究会
- Place of Presentation
  名古屋大学, 愛知県
- Year and Date
  2014-03-11
- Data Source
  KAKENHI-PROJECT-23500004
[Presentation] 不正者の対称性のもとでの確率的な電子指紋符号に対する符号化定理2013
- Author(s)
  古賀弘樹，児矢野和也
- Organizer
  電子情報通信学会
- Place of Presentation
  芦原温泉　まつや千千
- Data Source
  KAKENHI-PROJECT-23500004
[Presentation] (k,n)しきい値法における多数決を用いた不正検出方式とその性能評価2013
- Author(s)
  島崎憲明，古賀弘樹
- Organizer
  電子情報通信学会　情報理論研究会
- Place of Presentation
  関西学院大学
- Data Source
  KAKENHI-PROJECT-23500004
[Presentation] 不正者の対称性のもとでの電子指紋符号に対する符号化定理2013
- Author(s)
  古賀弘樹，児矢野和也
- Organizer
  電子情報通信学会　情報理論研究会
- Place of Presentation
  まつや千千
- Data Source
  KAKENHI-PROJECT-23500004
[Presentation] 不正者の対称性のもとでの確率的な電子指紋符号に対する符号化定理2013
- Author(s)
  古賀弘樹, 児矢野和也
- Organizer
  電子情報通信学会情報理論研究会
- Place of Presentation
  あわら温泉まつや千千, 福井県
- Year and Date
  2013-05-24
- Data Source
  KAKENHI-PROJECT-23500004
[Presentation] 確率的攻撃モデルにおけるBoneh-Shaw 符号の不正者追跡アルゴリズム2012
- Author(s)
  金井紘平, 古賀弘樹
- Organizer
  電子情報通信学会情報理論研究会
- Place of Presentation
  豊田工業大学, 愛知県
- Year and Date
  2012-07-19
- Data Source
  KAKENHI-PROJECT-23500004
[Presentation] 確率的攻撃モデルにおけるBoneh-Shaw符号の不正者追跡アルゴリズム2012
- Author(s)
  金井紘平，古賀弘樹
- Organizer
  電子情報通信学会　情報理論研究会
- Place of Presentation
  豊田工業大学
- Data Source
  KAKENHI-PROJECT-23500004
[Presentation] なりすまし攻撃を検出できる(k,n)しきい値法の構成とその最適性2012
- Author(s)
  古賀弘樹
- Organizer
  電子情報学会2012年総合大会
- Place of Presentation
  岡山大学（岡山県）
- Data Source
  KAKENHI-PROJECT-23500004
[Presentation] 4種類の確率的極限と情報源符号化2011
- Author(s)
  古賀弘樹
- Organizer
  電子情報通信学会情報理論研究会
- Place of Presentation
  奈良学セミナーハウス
- Year and Date
  2011-01-18
- Data Source
  KAKENHI-PROJECT-20500004
[Presentation] 4種類の確率的極限と情報源符号化2011
- Author(s)
  古賀弘樹
- Organizer
  電子情報通信学会情報理論研究会,IT2010-60
- Place of Presentation
  国際奈良学セミナーハウス
- Year and Date
  2011-01-18
- Data Source
  KAKENHI-PROJECT-20500004
[Presentation] 情報スペクトルの幅と固定長符号化の最悪冗長度2011
- Author(s)
  古賀弘樹, 有村光晴, 岩田賢一
- Organizer
  電子情報通信学会情報理論研究会
- Place of Presentation
  大阪大学吹田キャンパス
- Year and Date
  2011-03-03
- Data Source
  KAKENHI-PROJECT-20500004
[Presentation] 確率的電子指紋符号の性能に関する情報理論的考察2011
- Author(s)
  児矢野和也, 古賀弘樹
- Organizer
  第34回情報理論とその応用シンポジウム
- Place of Presentation
  鶯宿温泉ホテル森の風, 岩手県
- Year and Date
  2011-12-02
- Data Source
  KAKENHI-PROJECT-23500004
[Presentation] 情報スペクトルの幅と固定長符号の最悪冗長度2011
- Author(s)
  古賀弘樹, 有村光晴, 岩田賢一
- Organizer
  電子情報通信学会情報理論研究会,IT2010-83
- Place of Presentation
  大阪大学
- Year and Date
  2011-03-03
- Data Source
  KAKENHI-PROJECT-20500004
[Presentation] 確率的電子指紋符号の性能に関する情報理論的考察2011
- Author(s)
  児矢野和也，古賀弘樹
- Organizer
  情報理論とその応用シンポジウム
- Place of Presentation
  ホテル森の風（岩手県）
- Data Source
  KAKENHI-PROJECT-23500004
[Presentation] On the Necessary Conditions for Identification of all the Malicious Users by a Digital Watermarking Code Based on a Projective Plane2010
- Author(s)
  Hiroki Koga
- Organizer
  第33回情報理論とその応用シンポジウム
- Place of Presentation
  信州松代ロイヤルホテル
- Year and Date
  2010-12-01
- Data Source
  KAKENHI-PROJECT-20500004
[Presentation] On the Necessary Conditions for Identification of all the Malicious Users by a Digital Watermarking Code Based on a Projective Plane2010
- Author(s)
  古賀弘樹
- Organizer
  第33回情報理論とその応用シンポジウム予稿集,pp.426-431
- Place of Presentation
  信州松代ロイヤルホテル
- Year and Date
  2010-12-01
- Data Source
  KAKENHI-PROJECT-20500004
[Presentation] AND攻撃に耐性をもつ詰託耐性符号の容量について2010
- Author(s)
  古賀弘樹
- Organizer
  電子情報通信学会情報理論研究会
- Place of Presentation
  信州大学
- Year and Date
  2010-03-05
- Data Source
  KAKENHI-PROJECT-20500004
[Presentation] AND攻撃に耐性をもつ結託耐性符号の容量について2010
- Author(s)
  古賀弘樹
- Organizer
  電子情報通信学会情報理論研究会,IT2009-110
- Place of Presentation
  信州大学
- Year and Date
  2010-03-05
- Data Source
  KAKENHI-PROJECT-20500004
[Presentation] BIBDを用いた結託耐性符号の基礎的性質2009
- Author(s)
  南祐典・古賀弘樹
- Organizer
  第32回情報理論とその応用シンポジウム
- Place of Presentation
  ホテルかめ福(山口県)
- Year and Date
  2009-12-03
- Data Source
  KAKENHI-PROJECT-20500004
[Presentation] 不正者全員を特定できるアフィン平面を利用した結託耐性符号の一構成法2009
- Author(s)
  南佑典, 古賀弘樹
- Organizer
  2009年暗号と情報セキュリティシンポジウム,IDI-1
- Place of Presentation
  大津プリンスホテル
- Year and Date
  2009-01-20
- Data Source
  KAKENHI-PROJECT-20500004
[Presentation] 情報スペクトル的手法の発展とその秘密分散法への応用(招待講演)2009
- Author(s)
  古賀弘樹
- Organizer
  電子情報通信学会情報理論研究会
- Place of Presentation
  ホテルかめ福(山口県)
- Year and Date
  2009-12-01
- Data Source
  KAKENHI-PROJECT-20500004
[Presentation] BIBDを用いた結託耐性符号の基礎的性質2009
- Author(s)
  南佑典, 古賀弘樹
- Organizer
  第32回情報理論とその応用シンポジウム予稿集,pp.532-537
- Place of Presentation
  山口湯田温泉ホテルかめ福
- Year and Date
  2009-12-03
- Data Source
  KAKENHI-PROJECT-20500004
[Presentation] 不正者全員を特定できるアフィン平面を利用した結託耐性符号の一構成法2009
- Author(s)
  南佑典、古賀弘樹
- Organizer
  2009年暗号と情報セキュリティシンポジウム
- Place of Presentation
  大津プリンスホテル (滋賀県大津市)
- Year and Date
  2009-01-20
- Data Source
  KAKENHI-PROJECT-20500004
[Presentation] 情報スペクトル的手法の発展とその秘密分散法への応用2009
- Author(s)
  古賀弘樹
- Organizer
  電子情報通信学会情報理論研究会,IT2009-47,(招待講演)
- Place of Presentation
  山口湯田温泉ホテルかめ福
- Year and Date
  2009-12-01
- Data Source
  KAKENHI-PROJECT-20500004
[Presentation] 複数,画像と復元できる視覚復号型(2,2)秘密分散法,提案2007
- Author(s)
  坂本木志・古賀弘樹
- Organizer
  電子情報通信学会情報理論研究会
- Place of Presentation
  神戸大学
- Year and Date
  2007-07-20
- Data Source
  KAKENHI-PROJECT-17700005
[Presentation] 連続分布に基づき符号語が生成される電子指紋符号の容量の下界について
- Author(s)
  板橋薫，古賀弘樹
- Organizer
  電子情報通信学会　情報理論研究会
- Place of Presentation
  京都市国際交流会館（京都）
- Year and Date
  2015-05-21 – 2015-05-22
- Data Source
  KAKENHI-PROJECT-26330003

1. YAMAMOTO Hirosuke (30136212)

# of Collaborated Projects: 4 results

# of Collaborated Products: 1 results
2. ARIMOTO Suguru (00029399)

# of Collaborated Projects: 3 results

# of Collaborated Products: 0 results
3. ARIMURA Mitsuharu (80313427)

# of Collaborated Projects: 2 results

# of Collaborated Products: 0 results
4. NANIWA Tomohide (40231493)

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results
5. Miao Ying (10302382)

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results
6. 小川朋宏 (00323527)

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results
7. 三嶋美和子 (00283284)

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results
8. 盧暁南 (10805683)

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results
9. LU SHAN (30755385)

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results
10. 神保雅一 (50103049)

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results
11. 澤正憲 (50508182)

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results
12. 鎌部浩 (80169614)

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results
13. HAMANO Kenji

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results
14. TANGUCHI Elliot

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results
15. SUIMON Yoshiyuki

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results
16. TASHIRO Yusuke

# of Collaborated Projects: 1 results

# of Collaborated Products: 0 results

Koga Hiroki 古賀 弘樹

KOGA Hiroki 古賀 弘樹

Research Projects

Research Products

Co-Researchers

Mathematical analyses on one-bit secret sharing schemes and their extensionsPrincipal Investigator

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Construction of a Robust Algorithm for Identification of All Malicious Users of a Digital Fingerprinting Code and Characterization of the Joint CapacityPrincipal Investigator

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Analysis and Construction of Combinatorial Structures with Sparse Incidence Matrices

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Developments of the Capacity Formula and Identification Algorithms for a Catch-All Digital Fingerprinting CodePrincipal Investigator

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Construction and Performance Analysis of Digital Fingerprinting Code with Identifiability of All Malicious UsersPrincipal Investigator

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Coding Theorems for Information-Theoretically Secure Systems with Stochastic EncodersPrincipal Investigator

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Analysis of Coding Tree Characteristics and its Applications to Data Compression and Cryptosystems

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計算量的に効率のよい秘密分散法の実現に関する研究Principal Investigator

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最適性をもつ視覚復号型秘密分散法の代数的な構成法に関する研究Principal Investigator

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一般情報源を一様乱数に変換する方法およびその暗号への適用に関する研究Principal Investigator

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一般情報源をもつシャノンの暗号システムに対する符号化定理に関する研究Principal Investigator

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秘密鍵暗号系に基づく認証システムに関する符号化定理Principal Investigator

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Research on source coding theorems for a multi-terminal communication system with a two-way channel

Principal Investigator

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Koga Hiroki 古賀弘樹

KOGA Hiroki 古賀弘樹