# Koji Nuida

# Personal Information

**Department of Mathematical Informatics, Graduate School of Information Science and TechnologyProfessor**

Room 354,Engineering Building 6, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656

Tel: 03-5841-6959 (ext. 26959)

Fax:

E-mail：nuida@mist.i.u-tokyo.ac.jp

## Biography

March 2001 | Bachelor (Science) Department of Mathematics, Faculty of Science, The University of Tokyo, Japan |
---|---|

March 2003 | M.S. (Mathematical Sciences) Graduate School of Mathematical Sciences, The University of Tokyo, Japan |

March 2006 | Ph.D. (Mathematical Sciences) Graduate School of Mathematical Sciences, The University of Tokyo, Japan |

April 2006 | National Institute of Advanced Industrial Science and Technology, post-doc researcher, Japan |

April 2007 | National Institute of Advanced Industrial Science and Technology, researcher |

March 2013 | National Institute of Advanced Industrial Science and Technology, senior researcher, Japan |

October 2014 | Japan Science and Technology Agency, PRESTO (additional; until March 2018) |

April 2018 | Associate Professor, Graduate School of Information Science and Technology, The University of Tokyo, Japan |

## Research Themes

The main subjects of my research are cryptography and information security technologies that are bases of security for various information technologies. Examples are as follows:

● Theory of cryptography

Designs and security analyses for cryptographic schemes, particularly aiming at realizing long-term security against future adversaries with highly advanced computational powers.

● Privacy-preserving data mining

Secure computation schemes that enable to utilize data while preserving the security/privacy, in various application areas.

● Fundamental mathematics

Mathematical theory including group theory and discrete mathematics, and their application to cryptography.

## Main paper and books

- Koji Nuida, Goichiro Hanaoka, "On the security of pseudorandomized information-theoretically secure schemes", IEEE Transactions on Information Theory, vol.59, no.1, pp.635-652, 2013.
- Koji Nuida, Kaoru Kurosawa, "(Batch) Fully Homomorphic Encryption over Integers for Non-Binary Message Spaces", in: EUROCRYPT 2015 (Part I), LNCS vol.9056, pp.537-555, 2015.
- Kana Shimizu, Koji Nuida, Gunnar Ratsch, "Efficient Privacy-Preserving String Search and an Application in Genomics", Bioinformatics, vol.32, no.11, pp.1652-1661, 2016.
- Robert B. Howlett, Bernhard Muhlherr, Koji Nuida, "Intrinsic Reflections and Strongly Rigid Coxeter Groups", Proceedings of the London Mathematical Society, vol.116, no.3, pp.534-574, 2018.