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Security guaranteed wireless communication under spatial and local Gaussian noise assumptions
Date: 2016/9/14             Browse: 579

Security guaranteed wireless communication under spatial and local Gaussian noise assumptions

Speaker: Masahito Hayashi

Time: Sep 14, 10:30am – 11:30am

Location: Room 410, Teaching Building


We consider wireless communication between Alice and Bob with additive Gaussian noise when the intermediate space between Alice and Bob is controlled by Eve. That is, Eve is allowed to inject artificial noise to Bob's detection. In this situation, using backward reconciliation, we propose a protocol to generate secure keys between Alice and Bob under the assumption that Eve's detector has a Gaussian noise and Eve is out of Alice's neighborhood.

Also, we give a necessarily and sufficient condition to generate the agreed secure keys via our protocol. In our protocol, leaked information is rigorously and quantitatively guaranteed even with finite block-length code. We also consider how Bob can improve their key generation rate by inserting artificial noise to Eve's observation. The preliminary version of this talk is available from   


Masahito Hayashi received the B.S. degree from the Faculty of Sciences in Kyoto University, Japan, in 1994 and the M.S. and Ph.D. degrees in Mathematics from Kyoto University, Japan, in 1996 and 1999, respectively.


He worked in Kyoto University as a Research Fellow of the Japan Society of the Promotion of Science (JSPS) from 1998 to 2000, and worked in the Laboratory for Mathematical Neuroscience, Brain Science Institute, RIKEN from 2000 to 2003, and worked in ERATO Quantum Computation and Information Project, Japan Science and Technology Agency (JST) as the Research Head from 2000 to 2006.

He also worked in the Superrobust Computation Project Information Science and Technology Strategic Core (21st Century COE by MEXT) Graduate School of Information Science and Technology, The University of Tokyo as Adjunct Associate Professor from 2004 to 2007.

In 2006, he published the book ``Quantum Information: An Introduction'' from Springer, whose revised version will been published as ``Quantum Information Theory: Mathematical Foundation''from Graduate Texts in Physics, Springer in 2016.

He worked in the Graduate School of Information Sciences, Tohoku University as Associate Professor from 2007 to 2012.

In 2012, he joined the Graduate School of Mathematics, Nagoya University as Professor.

He also worked in Centre for Quantum Technologies, National University of Singapore as Visiting Research Associate Professor from 2009 to 2012 and as Visiting Research Professor from 2012 to now.

In 2011, he received Information Theory Society Paper Award (2011) for Information-Spectrum Approach to Second-Order Coding Rate in Channel Coding.

In 2016, he received the Japan Academy Medal from the Japan Academy and the JSPS Prize from Japan Society for the Promotion of Science.


He is on the Editorial Board of International Journal of Quantum Information and International Journal On Advances in Security.

His research interests include classical and quantum information theory, classical and quantum statistical inference, and classical and quantum information security.



SIST-Seminar 16065