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:
May. 26, 2009
Filed:
Apr. 04, 2005
Kei Karasawa, Tokyo, JP;
Katsunori Matsuura, Tokyo, JP;
Kei Karasawa, Tokyo, JP;
Katsunori Matsuura, Tokyo, JP;
Nippon Telegraph and Telephone Corporation, Tokyo, JP;
Abstract
When a packet is received from a counterpart apparatusconnected to the Internet, it is determined by a decryption determination partwhether to decrypt or bypass the received packet by referring to a filter information storage partbased on a sending source and sending destination IP addresses and port numbers and a protocol. If it is determined that decryption is to be performed, then the received packet is decrypted based on cryptographic communication channel information agreed in advance between the counterpart apparatusand a terminalwhich does not have an IPSec function, in a cryptographic communication channel information storage part, and sent to the terminal. The cryptographic communication channel information is used for establishing a packet communication channel in conformity with IPSec between the counterpart apparatusand the terminal, and includes an identification number, protocol information about whether encryption processing or signature processing, a cryptographic algorithm or key information, IP addresses and port numbers, and the like. The counterpart can use a transport mode.