Kabushiki Kaisha Toshiba

Daiki Ishihara

Hiroyoshi Haruki

Fukutomo Nakanishi

Satoshi Aoki

A detection systemincludes a control deviceand a monitoring devicecommunicably connected to the control device. An acquisition unitA of the control deviceacquires a target's observation value by a sensor. A first-noise-output unitB outputs a first-noise-value changing with time and less than a resolution of the sensor. An integration unitC outputs an integrated value obtained by integrating the first-noise-value and the observation value. A transmission unitD transmits the integrated value to the monitoring device. A separation unitA of the monitoring deviceseparates the integrated value from the control deviceinto the observation value and the first-noise-value. A second-noise-output unitB outputs a second-noise-value as the first-noise-value. A detection unitC detects whether the integrated value is a replay attack using the spatial distance between the first-noise-value and the second-noise-value.

Detection system, detection method, and computer program product

An attack control device according to an embodiment is provided with a storage unit and one or more hardware processors configured to function as a selection unit, a determination unit, and a calculation unit. The storage unit associates and stores a normal communication data model representing a model of communication data of a normal system, with each network segment. The selection unit specifies the network segment based on the communication prediction data predicted upon execution of the attack scenario and selects the normal communication data model associated with the network segment. The determination unit determines the similarity degree between the normal communication data represented by the normal communication data model, and the communication prediction data. The calculation unit calculates an effectiveness degree of the attack scenario to be higher as the similarity degree is higher.

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Yokohama Kanagawa, Japan

Daiki Ishihara