Shun Kojima

Project Research Associate, Institute of Industrial Science, The University of Tokyo *Profile is at the time of the award.

2024Inamori Research GrantsScience & Engineering

Research topics
Development of physical layer secret key generation for visible light communication systems
Keyword
Summary
In recent years, visible light communication systems have been attracting attention as a solution to the problem of tight frequency resources due to the increasing demand for high-speed, large-capacity communications. To realize visible light communications, lightweight and reliable security technology is imperative. Therefore, this research aims to realize robust and high-speed visible light communications by introducing a lightweight and information-theoretically secure physical layer secret key generation method that uses propagation path information as a random source.

Message

I want to contribute to the realization and development of next-generation technologies by researching to address various social issues with innovative and challenging ideas.

Outline of Research Achievments

In this study, we conducted theoretical analysis and performance evaluation of physical-layer secret-key generation to establish a lightweight, highly reliable security foundation for visible-light communication systems. Using an indoor visible light communication model, we evaluated the reciprocity of channel state information observed between a legitimate transmitter and receiver, its decorrelation from an eavesdropper’s observation, and the achievable secret key capacity. These analyses provided fundamental insights into the applicability of physical-layer secret-key generation to visible-light communication. Furthermore, we demonstrated the possibility of enhancing the randomness required for key generation by forming artificial multipath propagation channels using intelligent reflecting surfaces, thereby improving key generation performance.


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