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:
Dec. 31, 2019
Filed:
Oct. 27, 2017
Hitachi, Ltd., Tokyo, JP;
Hiroki Uchiyama, Tokyo, JP;
Akifumi Yato, Tokyo, JP;
Satoshi Ohkubo, Tokyo, JP;
Kohhei Yamaguchi, Tokyo, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
Proposed are a log analyzing system and a log analyzing method capable of more effectively defending a control system from unauthorized access. The log analyzing system which analyzes a communication log of a control device comprises a network device which receives a communication packet corresponding to the communication log from a network, and a monitoring device which monitors communication to the network device, wherein the monitoring device obtains a difference between a communication pattern of the communication packet and a stable pattern, which is a pattern of a communication in a state of no unauthorized access, restores the communication packet based on the difference, and notifies the restored communication packet.