Introduction of Evangelists

Security Master/Chief Security Scientist Katsumi Takahashi
  • Security Master/Chief Security Scientist

    Katsumi Takahashi

    He studies information security and is interested in security problems related to big data/IoT, specifically with privacy concerns. He has developed systems including secure multi-party computation, personal-data anonymization, "Fine-grained encryption", "Cloud-managed-key Cryptographic Scheme", "privango" with NTT cryptography research team. Since he has joined NTT, he has been studying information processing technology. In the early days of World-Wide Web, he performed pioneering works on location-based search engines "i-Townpage", "Mobile Info Search", "kokono Search", and so on. He also contributes as a mediator between technology areas and social system areas, and worked for revising Japanese personal information protection law in 2015. Chief Security Scientist of Social Informatics Laboratories. Security Master. Ph.D.

    Books

    • Efficient Secure Three-Party Sorting with Applications to Data Analysis and Heavy Hitters (CCS 2022: 125-138, Hiroki Hamada, Dai ikarashi, Ryo Kikuchi, Katsumi Takahashi, Junichi Tomita, Gilad Asharov Bar-Ilan University, Ariel Nof Technion, Benny Pinkas Bar-Ilan University)
    • Anonymization and Utilization of Personal Data (Seibunsha, 2017, Ryota Osumi, Katsumi Takahashi)
    • Zipf Distribution Model for Quantifying Risk of Re-identification from Trajectory Data (Journal of Information Processing Vol. 24 No. 5, pp. 816-823, 2016, Hiroaki Kikuchi, Katsumi Takahashi)
    • Proposal and Implementation Evaluation of Error-Detectable Lightweight Three-Party Secure Function Calculation (IPSJ Transactions on Information Processing, Vol. 52, No. 9, pp. 2674-2685, 2011, Hiroshi Chida, Dai ikarashi, Hiroki Hamada, Katsumi Takahashi)
    • Geo-word centric association rule mining (International Conference on Mobile Data Management, pp. 273-280, 2005, Katsumi Takahashi, Iko Pramudiono, Masaru Kitsuregawa)
    • Experiments on query expansion for Internet yellow page services using Web log mining (International Conference on Very Large Data Bases (VLDB), pp. 1008-1018, 2002, Yusuke Ohura, Katsumi Takahashi, Iko Pramudiono, Masaru Kitsuregawa)
    • Mobile Information Retrieval (Tokyo Denki University Publishing, Intellectual Information Technology Information Retrieval and Agents on the Internet, Chapter 4, pp. 85-112, 2002, Katsumi Takahashi)
    • Collection, Structuring, and Retrieval Methods for Location-Oriented Information (IPSJ Transactions on Information Processing, Vol. 41, No. 7, pp. 1987-1998, 2000, Seiji Yokomichi, Katsumi Takahashi, Nobuyuki Miura, Kenichi Shima)
    • Integration of Structured Information Directory with Heterogeneous and Distributed Information -Information Integration Directory- (IEICE Transactions on Electronics, Vol. J81-D1 No. 5, pp. 443-450, 1998, Katsumi Takahashi, Nobuyuki Miura, Yoshiyasu Nishibe, Kenichi Shima)
    • Approximate String Matching Method Based on Kana Variations in Personal Names (IPSJ Transactions on Information Processing, Vol. 36, No. 8, pp. 1906-1915, 1995, Katsumi Takahashi, Kyoji Umemura)

    Awards

    • 2023 IPSJ Achievement Award
    • 2017 IPSJ 2016 Best Paper Award
    • 2017 SCIS Innovation Paper Award
    • 2016 IPSJ Fellow
    • 2016 NTT Security Master
    • 2012 IPSJ 2011 Best Paper Award
    • 2001 IPSJ 2000 Best Paper Award

    Academic Society Officers, etc.

    • 2021- Member, Next-Generation Medical Infrastructure Law Working Group, Cabinet Office
    • 2021- Member, Study Group on the Utilization and Privacy Protection of Viewing Data in the Broadcasting Field, Ministry of Internal Affairs and Communications
    • 2021- Member, Working Group on the Handling of User Information in Platform Services, Ministry of Internal Affairs and Communications
    • 2015-2016 Member, Privacy Protection Task Force Considering Amendments to the Personal Information Protection Act, Ministry of Internal Affairs and Communications
    • 2014-2015 Member, Study Group on the Handling of Location Information in Emergencies, Ministry of Internal Affairs and Communications
    • 2014-2015 Advisory Committee Member, Multi-Stakeholder Process for Infrastructure Development on Informationization and Serviceization of the Japanese Economy and Society - Investigation Project on the Utilization of Personal Data, Ministry of Economy, Trade and Industry
    • 2014- Member, Information Security Advisory Board, Ministry of Internal Affairs and Communications, General Working Group
    • 2013-2015 Board Member, Information Processing Society of Japan
    • 2013-2014 Member, Technical Study Group of the Personal Data Study Group, Cabinet Secretariat
    • 2012-2013 Member, Research Group on the Use and Distribution of Personal Data, Ministry of Internal Affairs and Communications
    • 2010-2013 Standard Officer, Information Processing Society of Japan, Information Standards Survey Committee
    • 2009 General Chair, Computer Security Symposium 2009

    Visiting Professors, etc.

    • 2022- Special Professor, National Institute of Informatics
    • 2021-2022 Research Fellow, National Institute of Informatics
    • 2016-2021 Visiting Professor, National Institute of Informatics
    • 2011-2016 Visiting Professor, Graduate School of Systems and Information Engineering, University of Tsukuba
    • 2011 Part-time Lecturer, Faculty of Social Systems Science, Chiba Institute of Technology
    • 2010 Part-time Lecturer, Graduate School of Engineering, Toyohashi University of Technology

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