Ibaraki University's
Center for Information Technology

Associate Professor

OHTAKI Yasuhiro

Other affiliation / position

  1. Graduate School of Science and Engineering (Engineering) Department of Computer and Information Sciences 准教授


  1. Ibaraki University, Reseach Associate 1994/04-2001/03
  2. Ibaraki University, Lecturer 2001/04-2009/03
  3. Ibaraki University, Associate Professor 2009/04-Present

Academic background

  1. University of Tsukuba Third Cluster of College 情報学類 1989
  2. University of Tsukuba Graduate School, Division of Engineering 電子・情報工学 Doctor course 1994 Completed

Academic degrees

  1. 博士(工学) University of Tsukuba

Current state of research and teaching activities


Research Areas

  1. Fundamental Informatics
  2. Computer System Network

Subject of research

  1. Searchable Encryption 2006-Present
  2. Encrypted Audit Log 2003-2006
  3. Electric Intelectual Property Management System 1994-Present


  1. Academic Information Literacy Miyuki Uno, Yasuhiro Ohtaki, Hiroshi Noguchi, Hiromasa Habuchi 学術図書出版 2015/03/20 978-4-7806-0429-0


  1. Research paper (international conference proceedings) Joint Transition of Information Studies on Japanese Secondary Education - Meta Text Analysis of the Government Course Guidelines, 2018 Yuki Watanabe, Masanao Kobayashi, Noboru Nakamichi, Rieko Inaba, Shinya Watanabe, Takashi Hasuike, Takeo Tatsumi, Tomoharu Ugawa, Yasuhiro Ohtaki, Yoshifumi Yamamoto, Kei Onishi, Toshio Matsuura, Hiroshi Ishikawa Conference Proceedings of Hawaii International Conference on Education 2018 1706-1708 2018/01
  2. Research paper (scientific journal) Joint A university information system made robust against natural disasters by taking advantage of remotely distributed campuses Hiroshi Noguchi,Yasuhiro Ohtaki,Masaru Kamada International Journal of Space-Based and Situated Computing InderScience 6/ 3, 147-154 2016/11 2044-4893 10.1504/IJSSC.2016.080281
  3. Deployment of Single Sign-On Environment for Office365 and Shibboleth with multi factor authentication Hiroshi Noguchi, Yasuhiro Ohtaki, Yukio Takahashi, Masaru Kamada Journal for Academic Computing and Networking 20, 82-89 2016/09
  4. Research paper (research society, symposium materials, etc.) Study of future strategy ICT center - Better quality of services in the case of Ibaraki University – Hiroshi Noguchi, Yasuhiro Ohtaki, Masaru Kamada, Masanori Itaba, Satoru Ozawa Proceedings of International Symposium on ICT in Development 2015 2015/11
  5. Research paper (international conference proceedings) Joint Design and Practice of File Backup System Taking Advantage of Remotely Distributed Campuses Hiroshi Noguchi, Yasuhiro Ohtaki, Masaru Kamada Proceedings of the 4th International Workshop on Web Services and Social Media (WSSM-2015) 2015/09/02

Research presentations

  1. Oral presentation(general) 柱状回転体を用いたCAPTCHAの提案 第32回暗号と情報セキュリティシンポジウム 2015/01/23
  2. Oral presentation(general) Forward Privacyを考慮した動的な検索可能暗号 第32回暗号と情報セキュリティシンポジウム 2015/01/23
  3. Oral presentation(general) A Proposal of CAPTCHA Using Rotating Prismatic Objects ISCIU10 2014/11/15
  4. Oral presentation(general) Practical Dynamic SSE with Forward Privacy ISCIU10 2014/11/15
  5. Oral presentation(general) How to Update Documents Verifiably in Symmetric Searchable Encryption Crytography and Network Security 2013 ecture Notes in Computer Science 2013/11/01

Intellectual property rights

  1. アクセスログ管理方法 特願2003-126244 2003/05/01
  2. Patent 検索システム、検索方法および検索プログラム 特願2013-45246 2013/03/07 特開2014-174661 2014/09/22 6095057 2017/02/24
  3. Patent 検索システム、検索方法および検索プログラム 特願2012-20691 2012/02/02 特開2013-161154 2013/08/19 5970193 2016/07/15

Alloted class

  1. プログラミング言語処理系
  2. エンタープライズソフトウェア工学演習
  3. 情報工学実験
  4. Network Program Design
  5. 並列分散プログラミング

Memberships of academic societies

  1. 電子情報通信学会
  2. 情報処理学会
  3. IEEE

Committee Career

  1. 電子情報通信学会Fundamentals Review誌編集委員会 編集委員 2015/05/25-2017/05/24
  2. 独立行政法人大学入試センター 教科第一委員会委員 2015/04/01-2017/03/31
  3. 電子情報通信学会 情報セキュリティ研究専門委員会委員 2013/05/25-Present
  4. 電子情報通信学会 東京支部評議員 2007/04-2009/03