Group key agreement over free-space optical links

Hiroyuki Endo, Mikio Fujiwara, Mitsuo Kitamura, Orie Tsuzuki, Ryosuke Shimizu, Masahiro Takeoka, Masahide Sasaki

研究成果: Article査読

抄録

Free-space optical (FSO) communications can offer secure connectivity thanks to the high directionality of the laser beam and the line-of-sight configuration. These security advantages are employed to realize high-speed key establishment between two distant parties, which is provably secure against an eavesdropper with unlimited computational resources. Besides, a well-maintained laser beam divergence allows group key agreement (GKA) among multiple parties. Here, we propose a novel method of GKA over FSO link—FSO-GKA. After numerically characterizing fundamental behaviors, we present a proof-of-concept demonstration of FSO-GKA using a 7.8-km terrestrial link. We achieve a group key rate of roughly 8 Mbps over a 58dB-loss channel based on 10-MHz on-off keying. We also investigate information leakage risks under several atmospheric conditions, which provides the basis for security certification of FSO-GKA. Our proposed scheme shows a new way to construct high-speed key exchange platforms.

本文言語English
ページ(範囲)2525-2543
ページ数19
ジャーナルOSA Continuum
3
9
DOI
出版ステータスPublished - 2020 9 15
外部発表はい

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 原子分子物理学および光学
  • 電子工学および電気工学

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