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:
Oct. 18, 2011
Filed:
Apr. 19, 2007
Akio Tajima, Tokyo, JP;
Akihiro Tanaka, Tokyo, JP;
Wakako Maeda, Tokyo, JP;
Seigo Takahashi, Tokyo, JP;
Akio Tajima, Tokyo, JP;
Akihiro Tanaka, Tokyo, JP;
Wakako Maeda, Tokyo, JP;
Seigo Takahashi, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
A secret communications system realizes point-to-multipoint or multipoint-to-multipoint connections of both quantum channels and classical channels. Multiple remote nodes are individually connected to a center node through optical fiber, and random-number strings Kto KN are individually generated and shared between the respective remote nodes and the center node. Encrypted communication is performed between each remote node and the center node by using the corresponding one of the shared random-number strings Kto KN as a cryptographic key. The center node is provided with a switch section for quantum channels and a switch section for classical channels. Switching control on each of these switch sections is performed independently of the other by a controller.