744 Motooka, Nishi-ku

Fukuoka 819-0395, Japan

TEL (Office): +81-92-802-4402

FAX (Office): +81-92-802-4405

##### IMI(Institute of Mathematics for Industry)

# Detail of Academic Staffs

## TAKAGI, Tsuyoshi/ Professor

TAKAGI, Tsuyoshi（Professor） Cryptography has become one of the most important areas in information technology. With cryptography it is possible to construct many security protocols which are the basic infrastructure for secure communications like SSL, IPsec, SSH,... Two inevitable concepts for these attractive applications are public-key cryptosystem and digital signature. Interestingly, the security of these concepts are underpinned by the difficulty of mathematical problems, for examples, a factoring problem, a discrete logarithm problem over elliptic curves, and lattice theory. Once the underlying problem is broken, the whole system using the problem is no longer secure. One of the main research subjects is to investigate the security of these problems and its implication to cryptographic protocols.

Keyword | Cryptography, Information Security, Computational Number Theory |

Division | Laboratory of Mathematical Design for Advanced Cryptography ,Laboratory of Advanced Software in Mathematics (concurrent) |

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