The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 28, 2026
Filed:
Dec. 21, 2022
National Institute of Information and Communications Technology, Tokyo, JP;
Hiroyuki Endo, Tokyo, JP;
Masahide Sasaki, Tokyo, JP;
Mikio Fujiwara, Tokyo, JP;
Masahiro Takeoka, Tokyo, JP;
Masato Koashi, Tokyo, JP;
Toshihiko Sasaki, Tokyo, JP;
Abstract
A sender system is equipped with an optical transmitter that transmits an encoded optical signal at a predetermined strength via an LOS communication channel, and a key distillator that generates a cryptographic key from a random bit sequence of the optical transmitter by a key distillation processing via the authenticated public communication channel. A legitimate receiver is equipped with an optical receiver that receives the optical signal from the optical transmitter via the LOS communication channel, and a key distillator that generates a cryptographic key from the random bit sequence from the optical receiver through a key distillation processing via the authenticated public communication channel.