Patent ID: 11936675
Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
Field: Digital communication (Electrical engineering)
Classification: CPC H  G | IPC H

Claim 13:
14. An estimation device, comprising:
processing circuitry configured to
receive a device ID for identifying a device in a private network and an observation event that has occurred in the device as an input;
acquire, from a device information memory, attribute information of the device corresponding to the device ID;
estimate a risk that the device in the private network is subject to an attack, based on the acquired attribute information and the observation event; and
output a state transition diagram, wherein

to estimate the risk, the circuitry is configured to:
first calculate a first probability that the device is subject to unauthorized access from a public network;
second calculate a second probability, based on the first probability, that the device is subject to unauthorized access to the private network;
third calculate a third probability, based on the first probability, that the device is subject to unauthorized input to network provider of the private network, and
estimates the risk based on the second probability and the third probability, and

the state transition diagram illustrates a step-by-step process of estimating the risk, the state transition diagram including formulas for the first calculation, the second calculation, the third calculation and the estimation of the risk.