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.:

US 7602915 B1

Expired

Date of Patent:

Oct. 13, 2009

Filed:

Apr. 28, 2005

Communication system having plurality of nodes sharing a common cipher key, cipher key dispatching apparatus for use in the system, and anti-theft apparatus utilizing information derived from cipher key utilization

Applicant:

Takahiro Iwamura, Nishio, JP;

Inventor:

Takahiro Iwamura, Nishio, JP;

Assignee:

DENSO CORPORATION, Kariya, JP;

Attorney:

Posz Law Group, PLC

Primary Examiner:

Kambiz Zand

Assistant Examiner:

Monjour Rahim

Int. Cl.

CPC ...

H04L 9/00 (2006.01);

U.S. Cl.

CPC ...

Abstract

A communication system has a plurality of nodes that perform encrypted communication via a LAN, each using an identical common cipher key. The common cipher key is replaced at fixed or irregular intervals, by being transmitted from a main node in a broadcast mode via the LAN to respective secondary nodes that are to share the key. When the key is successfully received by a secondary node, it returns a confirmation signal. The system can be configured such that a notification list of secondary nodes for which key acquisition has been confirmed is transmitted to all of the secondary nodes.

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Iwamura, Takahiro. (2009). Communication system having plurality of nodes sharing a common cipher key, cipher key dispatching apparatus for use in the system, and anti-theft apparatus utilizing information derived from cipher key utilization (U.S. Patent No. 7602915). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/7602915

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