



Author: suuri1
Lab. 1: Takagi
Personal Information
Department of Mathematical Informatics,
Graduate School of Information Science and Technology
Professor
Room 343,Engineering Building 6, 731 Hongo, Bunkyoku, Tokyo, 1138656
Tel: 0358416940 (ext. 26940)
Fax:
Email：takagi@mist.i.utokyo.ac.jp
Biography
March 1995  M.Sc., Graduate School of Mathematics, Nagoya University, Japan 

April 1995  Researcher, NTT Laboratories, Tokyo 
October 1997  Guest researcher, Department of Computer Science, Technische Universitaet Darmstadt, Germany 
October 1998  Researcher, NTT Laboratories, Germany 
January 2001  PhD with honors, Department of Computer Science, Technische Universitaet Darmstadt, Germany 
July 2002  Assistant Professor, Department of Computer Science, Technische Universitaet Darmstadt, Germany 
April 2005  Associate Professor, School of Systems Information Science, Future University Hakodate, Japan 
April 2008  Professor, School of Systems Information Science, Future University Hakodate, Japan 
April 2010  Professor, Faculty of Mathematics, Kyushu University, Japan 
April 2011  Professor, Institute of Mathematics for Industry, Kyushu University, Japan 
April 2017  Professor, Graduate School of Information Science and Technology, The University of Tokyo, Japan 
Research Themes
We investigate the theory and practice of cryptography which underpins the security of our information society.
● Cryptography
We study postquantum cryptography based on the mathematical problems (such as coding theory, lattice theory, multivariate polynomials, graph theory, etc), which are computationally intractable even in the era of quantum computing.
● Information Security
We are engaged in the development of new efficient cryptographic algorithms and implementation secure against physical attacks, which can be used in our life, for example, copyright protection, electronic voting, cryptocurrency, and so on.
Main paper and books
 Tsuyoshi Takagi (Ed), “PostQuantum Cryptography – 7th International Workshop, PQCrypto 2016,” LNCS 9606, Springer 2016.
 Kaoru Kurosawa, Tsuyoshi Takagi, “OneWayness Equivalent to General Factoring,” IEEE Transactions on Information Theory, Vol.55, No.9, pp.42494262, 2009.
 Tsuyoshi Takagi, “A Fast RSAType PublicKey Primitive Modulo pkq,” IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences, Vol.E87A, No.1, pp.94100, 2004.