Authentication system, mobile device, processing device, and non-transitory computer-readable medium

1. An authentication system, comprising:

a mobile device adapted to be carried by a person to be authenticated;

an acceleration sensor installed in the mobile device and configured to output an acceleration signal corresponding to acceleration applied to the mobile device;

a processing device configured to execute determination processing for determining whether the person is walking based on the acceleration signal; and

a control device configured to control an operation of a controlled device based on a result of the determination processing and a result of authentication processing for authenticating, by way of the mobile device, the person as a user of the controlled device,

wherein the processing device is configured to shorten a prescribed time period in a case where an amount of change in the acceleration falls below a threshold while the determination processing is executed; and

wherein the processing device is configured to determine that the person is not walking in a case where the prescribed time period is elapsed.

2. The authentication system according to claim 1 ,

wherein in a case where a determination that the person is walking is validated by the processing device, the control of the controlled device based on the authentication processing is disabled.

3. The authentication system according to claim 1 ,

wherein the processing device is installed in the mobile device.

4. An authentication system, comprising:

a mobile device adapted to be carried by a person to be authenticated;

an acceleration sensor installed in the mobile device and configured to output an acceleration signal corresponding to acceleration applied to the mobile device;

a processing device configured to execute determination processing for determining whether the person is walking based on the acceleration signal; and

a control device configured to control an operation of a controlled device based on a result of the determination processing and a result of authentication processing for authenticating, by way of the mobile device, the person as a user of the controlled device,

wherein the processing device is configured to determine that the person is not walking in a case where an amount of change in the acceleration falls below a threshold before a prescribed time period elapses while the determination processing is executed;

wherein in a case where same determinations as to whether the person is walking are made M times while the determination processing is repeated N times, the processing device validates the determination; and

wherein N is an integer that is no less than 2, and M is an integer that is no less than 2 and no more than N.

5. A mobile device adapted to be carried by a person to be authenticated, comprising:

an acceleration sensor configured to output an acceleration signal corresponding to acceleration applied to the mobile device; and

a processor configured to execute determination processing for determining whether the person is walking based on the acceleration signal, and to output a result of the determination processing to a control device configured to execute authentication processing for authenticating the person as a user of a controlled device,

wherein the processor is configured to shorten a prescribed time period in a case where an amount of change in the acceleration falls below a threshold while the determination processing is executed; and

wherein the processor is configured to determine that the person is not walking in a case where the prescribed time period is elapsed.

6. A processing device, comprising:

a reception interface configured to accept an acceleration signal corresponding to acceleration applied to a mobile device adapted to be carried by a person to be authenticated from an acceleration sensor installed in the mobile device; and

a processor configured to execute determination processing for determining whether the person is walking based on the acceleration signal, and to output a result of the determination processing to a control device configured to execute authentication processing for authenticating the person as a user of a controlled device,

wherein the processor is configured to shorten a prescribed time period in a case where an amount of change in the acceleration falls below a threshold while the determination processing is executed; and

wherein the processor is configured to determine that the person is not walking in a case where the prescribed time period is elapsed.

7. A non-transitory computer-readable medium having stored a computer program adapted to be executed by a processor of a processing device and configured to, when executed, cause the processing device to:

accept an acceleration signal corresponding to acceleration applied to a mobile device adapted to be carried by a person to be authenticated from an acceleration sensor installed in the mobile device;

execute determination processing for determining whether the person is walking based on the acceleration signal;

shorten a prescribed time period in a case where an amount of change in the acceleration falls below a threshold while the determination processing is executed;

determine that the person is not walking in a case where the prescribed time period is elapsed; and

output a result of the determination processing to a control device configured to execute authentication processing for authenticating the person as a user of a controlled device.