Information Mathematics Seminar

Seminar information archive ~07/24Next seminarFuture seminars 07/25~

Date, time & place Thursday 16:50 - 18:35 128Room #128 (Graduate School of Math. Sci. Bldg.)
Organizer(s) Toshiyuki Katsura

Seminar information archive

2024/02/08

16:50-18:35   Room #128 (Graduate School of Math. Sci. Bldg.)
Keita Kanno (QunaSys Inc.)
Current status of quantum computing and its applications (Japanese)
[ Abstract ]
In this seminar, current status and future prospects of quantum computing and its applications will be presented.

2024/01/25

16:50-18:35   Room #056 (Graduate School of Math. Sci. Bldg.)
Yasunari Suzuki (NTT)
Design and control of fault-tolerant quantum computer (Japanese)
[ Abstract ]
To demonstrate quantum computational advantage, we need quantum error-correction technology to reduce effective error rates to a small value. In this talk, we explain methods to fault-tolerantly control encoded logical information and methods to translate practical algorithms to basic operations.

2024/01/11

16:50-18:35   Room #128 (Graduate School of Math. Sci. Bldg.)
Yasunari Suzuki (MTT)
Introduction to quantum computation and quantum error correction (Japanese)
[ Abstract ]
To demonstrate quantum computational advantage, we need quantum error-correction technology to reduce effective error rates to a small value. In this talk, we introduce the basic theory of quantum computation and quantum error-correcting codes.

2023/12/21

16:50-18:35   Room #128 (Graduate School of Math. Sci. Bldg.)
Takashi Yamakawa (NTT)
Quantum Computing and Cryptography (Japanese)
[ Abstract ]
I explain several topics on quantum computing and cryptography including quantum money and verification of quantum computation based on cryptography.  

2023/12/14

16:50-18:35   Room #128 (Graduate School of Math. Sci. Bldg.)
Junichi Tomida (NTT)
Functional encryption and attribute-based encryption (Japanese)
[ Abstract ]
I will explain the basics and the recent progress of functional encryption and attribute-based encryption.

2023/12/07

16:50-18:35   Room #128 (Graduate School of Math. Sci. Bldg.)
Ryo Nishimaki (NTT)
Cryptographic Program Obfuscation and Its Applications (Japanese)
[ Abstract ]
I will explain what cryptographically secure program obfuscation is, how to achieve it, and its applications in this talk.

2023/11/16

16:50-18:35   Room #128 (Graduate School of Math. Sci. Bldg.)
Takuya Yamauchi (Tohoku Univ.)
Isogeny graphs on superspecial abelian varieties: Eigenvalues, Connection to Bruhat-Tits buildings, and Property (T) (Japanese)
[ Abstract ]
For each fixed integer $g\ge 2$,  a prime $p$, and all primes $\ell$  with $\ell\neq p$, we can consider finite regular directed graphs associated with the set of equivalence classes of $\ell$-marked principally polarized superspecial abelian varieties of dimension $g$ in characteristic $p$. In this talk, I will explain that we can study such graphs in terms of the corresponding Bruhat-Tits buildings. I also discuss the eigenvalues values of the random walk matrices in view of the theory of automorphic representations when $g=2$. This is a joint work with Y. Aikawa (Tokyo university) and R. Tanaka (Kyoto university).  

2023/11/09

16:50-18:35   Room #128 (Graduate School of Math. Sci. Bldg.)
Katsuyuki Takashima (Waseda Univ.)
Mathematical Aspects of Isogeny-Based Cryptography (Japanese)
[ Abstract ]
I will explain mathematical aspects of isogeny-based cryptography.

2023/11/02

16:50-18:35   Room #128 (Graduate School of Math. Sci. Bldg.)
Masaya Yasuda (Rikkyo Univ.)
Algorithms for solving lattice problems and their applications (Japanese)
[ Abstract ]
In this talk, I introduce lattice algorithms such as LLL and BKZ reduction algorithms,
which are mandatory for solving lattice problems. I also describe how to solve LWE and
NTRU problems using lattice algorithms. In addition, I describe an application of lattice
algorithms for solving the integer factorization problem.

2023/10/19

16:50-18:35   Room #128 (Graduate School of Math. Sci. Bldg.)
Katsuyuki Takashima (Waseda Univ.)
Mathematical Aspects of Lattice-Based Cryptography (Japanese)
[ Abstract ]
I will explain mathematical aspects of lattice-based cryptography.

2023/10/05

16:50-18:35   Room #128 (Graduate School of Math. Sci. Bldg.)
Tatsuaki Okamoto (NTT)
Cryptography and Blockchain (Japanese)
[ Abstract ]
Explanation of cryptography and blockchain

2023/07/13

16:50-18:35   Room #128 (Graduate School of Math. Sci. Bldg.)
Tatsuaki Okamoto (NTT)
Fully Homorphic Encryption and Functional Encryption (Japanese)
[ Abstract ]
Explanation of fully homorphic encryption and functional encryption

2023/07/06

16:50-18:35   Room #128 (Graduate School of Math. Sci. Bldg.)
Tatsuaki Okamoto (NTT)
Cryptographic protocols (Japanese)
[ Abstract ]
Explanation of cryptographic protocols

2023/06/29

16:50-18:35   Room #128 (Graduate School of Math. Sci. Bldg.)
Tatsuaki Okamoto (NTT)
Zero-knowledge proofs (Japanese)
[ Abstract ]
Explanation of the theory of zero-knowledge proofs

2023/06/22

16:50-18:35   Room #128 (Graduate School of Math. Sci. Bldg.)
Tatsuaki Okamoto (NTT)
Lattice-based cryptography (Japanese)
[ Abstract ]
Explanation of lattice-based cryptography

2023/06/15

16:50-18:35   Room #128 (Graduate School of Math. Sci. Bldg.)
Tatsuaki Okamoto (NTT)
Cryptosystems based on elliptic curves (Japanese)
[ Abstract ]
Explanation of crypto-systems based on elliptic curves

2023/06/08

16:50-18:35   Room #128 (Graduate School of Math. Sci. Bldg.)
Tatsuaki Okamoto (NTT)
Security, construction and proof of digital signatures (Japanese)
[ Abstract ]
Explanation of security, construction and proof of digital signatures

2023/05/25

16:50-18:35   Room #128 (Graduate School of Math. Sci. Bldg.)
Tatsuaki Okamoto (NTT)
Security, construction, and proof of public-key encryption (2) (Japanese)
[ Abstract ]
Explanation of security, construction and proof of public-key encryption

2023/05/18

16:50-18:35   Room #128 (Graduate School of Math. Sci. Bldg.)
Tatsuaki Okamoto (NTT)
Security, construction, and proof of public-key encryption (1) (Japanese)
[ Abstract ]
Explanation on security, construction, and proof of public-key encryption

2023/05/11

16:50-18:35   Room #128 (Graduate School of Math. Sci. Bldg.)
Tatsuaki Okamoto (NTT)
The security definition and proof of symmetric key encryption and public key encryption (Japanese)
[ Abstract ]
Explanation of the security definition and proof of symmetric key encryption and public key encryption

2023/04/27

16:50-18:35   Room #128 (Graduate School of Math. Sci. Bldg.)
Tatsuaki Okamoto (NTT)
The basics of cryptography II (Japanese)
[ Abstract ]
Explanation of the basics of cryptography

2023/04/20

16:50-18:35   Room #128 (Graduate School of Math. Sci. Bldg.)
Tatsuaki Okamoto (NTT)
The basics of cryptography (Japanese)
[ Abstract ]
Explanation of the basics of cryptography

2023/04/13

16:50-18:35   Room #128 (Graduate School of Math. Sci. Bldg.)
Tatsuaki Okamoto (NTT)
Certification and signature
------Foundation of cryptography (Japanese)
[ Abstract ]
Explanation on certification and signature.

2023/04/06

16:50-18:35   Room #128 (Graduate School of Math. Sci. Bldg.)
Tatsuaki Okamoto (NTT)
The role of cryptography (Japanese)
[ Abstract ]
Explanation of the theory of cryptography

2023/01/19

16:50-18:35   Room #123 (Graduate School of Math. Sci. Bldg.)
Shintaro Narisada (KDDI Research, Inc.)
Code-based cryptography and its decoding algorithm (Japanese)
[ Abstract ]
This talk overviews code-based cryptography and its decoding algorithm called Information Set Decoding (ISD). All lectures will be given in Japanese.

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