Wireless secret key agreement system on magnetic fluctuation for wireless charging system.

2021 Fiscal Year Final Research Report

• Project/Area Number: 17K14680
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Communication/Network engineering
• Research Institution: Kanazawa Institute of Technology (2019-2021); Toyohashi University of Technology (2017-2018)
• Principal Investigator: Sakai Naoki 金沢工業大学, 電気・光・エネルギー応用研究センター, 研究員 (10736177)
• Project Period (FY): 2017-04-01 – 2022-03-31
• Keywords: 近傍電磁界 / 無線秘密鍵共有システム / 磁界結合方式 / ワイヤレス電力伝送 / フレネル界

Outline of Final Research Achievements

This work proposes the wireless secret key agreement (WSA) system for a wireless charging system based on magnetic coupling and evaluates the secrecy of the proposed approach.
Evaluation 1: we evaluate the secrecy of the received power fluctuation generated by the WSA system. Evaluation 2: we evaluate wiretapping tolerance of the secret key.
Result 1: the WSA system generated the received power fluctuation that occurred by changing randomly for the connection between the RF source and a transmitting coil in 4x4 transmitting coils. The received power fluctuation is high secrecy. Result 2: the WSA system is added an illegal receiver. We generated the secret key from the received power fluctuation of a legal receiver and evaluated the wiretapping tolerance of the secret key. High wiretapping tolerance was obtained by adjusting the number of connections between the power source and the transmitting coils.

Free Research Field

マイクロ波

Academic Significance and Societal Importance of the Research Achievements

本研究の成果は磁界ゆらぎという物理現象を情報の暗号化に活用できる可能性が高いことを、世界で初めて示したことが学術的に意義深いといえる。また、計算機や数学の進歩によらない新しい暗号化技術の可能性を示すという点において、情報化社会にとっても重要な知見である。