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:
Mar. 11, 2014
Filed:
Dec. 28, 2007
Josuke Matsuki, Yugawara, JP;
Masashi Takatsuki, Fujisawa, JP;
Yukihiro Shimmura, Fujisawa, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
The communications between terminals are encrypted, and even a gateway device is permitted to analyze the encrypted communications, thereby to incarnate censorship for the prevention of information leakage. A gateway deviceprepares a public key and a secret key in a pair on the basis of a public key encryption system, and distributes the public key to terminals-which are managed by the gateway device. The terminals-subject a communication packet to a prior-art common key encryption, and they thereafter encrypt a common key with the public key and bestow the encrypted common key on the packet. The gateway devicedecrypts the common key by using the secret key, censors the packet and returns the packet into a prior-art encrypted packet format, and it thereafter transfers the packet to a networkwhere opposite terminals-exist.