US 11,658,988 B2
Dynamic physical watermarking for attack detection in cyber-physical systems
Masoud Abbaszadeh, Clifton Park, NY (US); Justin John, Niskayuna, NY (US); and Austars Raymond Schnore, Jr., Scotia (CA)
Assigned to GENERAL ELECTRIC COMPANY, Schenectady, NY (US)
Filed by General Electric Company, Schenectady, NY (US)
Filed on Sep. 9, 2021, as Appl. No. 17/470,311.
Application 17/470,311 is a continuation of application No. 16/144,136, filed on Sep. 27, 2018, granted, now 11,159,540.
Prior Publication US 2022/0086176 A1, Mar. 17, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. H04L 9/40 (2022.01); H04L 43/04 (2022.01)
CPC H04L 63/1416 (2013.01) [H04L 63/123 (2013.01); H04L 63/145 (2013.01); H04L 63/1425 (2013.01); H04L 63/1466 (2013.01); H04L 63/30 (2013.01); H04L 43/04 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A method for a system to protect a cyber-physical system having a plurality of system nodes including a plurality of monitoring nodes each generating a series of current monitoring node values over time that represent current operation of the cyber-physical system, the method comprising:
randomly injecting, by a computer processor of a watermarking computer platform, a watermarking signal into a unit set-point signal sent from a supervisory level controller to a unit level controller;
receiving current monitoring node values over time; and
generating a current watermarking feature vector based on the current monitoring node values.