Patent ID: 11876811
Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
Field: Digital communication (Electrical engineering)
Classification: CPC H  G | IPC H

Claim 0:
1. A detection method executed in a detection system comprising a sensor and a controller, the detection method comprising:
a state estimation process of the controller calculating, using sensor data indicating a state of a control target outputted from the sensor and a control input to control the state of the control target, an estimate of the state of the control target;
a calculation process of the controller calculating the control input to which colored noise in a predetermined frequency band is added, according to the estimate of the state of the control target which has been calculated; and
responsive to the state estimate process and the calculation process, detecting an attack using past sensor data when a difference between the estimate of the state of the control target and an output of the calculation process exceeds a predetermined threshold.