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. 18, 2019
Filed:
Mar. 22, 2017
Toshiba Digital Solutions Corporation, Kawasaki-shi, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota-shi, JP;
Koji Yura, Yokohama, JP;
Takeshi Kitamura, Kawasaki, JP;
Hideki Goto, Minato-ku, JP;
Tomokazu Moriya, Setagaya-ku, JP;
TOSHIBA DIGITAL SOLUTIONS CORPORATION, Kawasaki-shi, JP;
TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota-shi, JP;
Abstract
A network monitoring device according to an embodiment monitors a message that is periodically transmitted in a network in which a message identified by an identifier is transmitted and received, and includes a reception time recording unit and an unauthorized-transmission determination unit. The reception time recording unit records a reception time in association with the identifier, every time a message to be monitored is received. The unauthorized-transmission determination unit determines presence of an unauthorized transmission on the received message to be to be monitored, based on a latest reception time T, an m previous reception time T, a message transmission period F, and a constant σ determined in advance, in a period from the reception time Tto the reception time T, every time the message to be monitored is received.