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Log analyzing system and method

  • US 10,523,696 B2
  • Filed: 10/27/2017
  • Issued: 12/31/2019
  • Est. Priority Date: 11/01/2016
  • Status: Active Grant
First Claim
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1. A log analyzing system which analyzes a log of communications of a control device, the log analyzing system comprising:

  • a network device which receives a plurality of communication packets corresponding to the communications of the control device from a network; and

    a monitoring device which monitors the plurality of communication packets to the network device including reception times and reception sizes of the plurality of communication packets,wherein the monitoring device is programmed to;

    create time series data indicating respective reception times and receptions sizes of the plurality of communication packets,frequency convert the time series data to generate information of respective frequencies and strength of the plurality of communication packets based on the respective reception times and receptions sizes of the plurality of communication packets,extract an abnormal pattern by determining a difference between the frequency-converted time series data and a predetermined stable pattern representing communication in a state of no unauthorized access, andinverse frequency convert the extracted abnormal pattern to acquire one or more respective times and sizes of one or more abnormal communication packets among the plurality of communication packets, andoutput the one or more abnormal communication packets including the respective times and sizes thereof.

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