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:
Jun. 24, 1997
Filed:
Dec. 19, 1994
Applicant:
Inventors:
Yasutsugu Kuroda, Kawasaki, JP;
Hiroaki Kikuchi, Sagamihara, JP;
Assignee:
Fujitsu Limited, Kawasaki, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04L / ;
U.S. Cl.
CPC ...
380 30 ;
Abstract
A cryptographic information repeater installed in a system for transmitting information among a plurality of subscribers interconnected by a communication line. The repeater acts as a managing center for managing cryptokeys. Therefore, confidentiality can be effectively preserved because a common secret key is not shared by all the subscribers. When some subscriber withdraws or a new user enters, it is only necessary to update the database concentrated in the cryptographic information repeater. Therefore, if the number of subscribers increases, it will not be cumbersome to manage the data.