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

A mobile device adapted to be carried by a person to be authenticated and to perform wireless communication with a control device configured to execute authentication processing for authenticating the person as a user of a controlled device, the mobile device comprising:

• a receiver configured to receive a radio signal wirelessly transmitted from the control device;
• 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 the control device,
• wherein the acceleration sensor and the determination processing by the processor are in a standby state until the mobile device receives the radio signal from the control device, so that the determination processing is activated in response to reception of the radio signal by the receiver.

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 processor configured to define a time period as time between a first time point at which the acceleration signal satisfies a prescribed condition and a second time point at which the acceleration signal satisfies the prescribed condition again before a prescribed time period is elapsed from the first time point, and to execute determination processing for determining whether the person is walking based on a feature quantity associated with the waveform portion of the acceleration signal within the time period;
• 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 prescribed condition includes an acceleration represented by the acceleration signal that changes from a first value more than a first threshold to a second value less than the first threshold, and an amount of change in the acceleration per unit time that exceeds a second threshold;
• and
• wherein the feature quantity includes at least one of:
• a time length between specific points in the waveform portion;
• a value of the acceleration at a specific point in the waveform portion;
• a difference between values of the acceleration at the specific points in the waveform portion;
• a statistic value of the acceleration at the specific point in the waveform portion;
• a difference between statistic values of the acceleration at the specific points in the waveform portion;
• and
• an amount of change in the acceleration per unit time between the specific points in the waveform portion.

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:
• define a time period as time between a first time point at which the acceleration signal satisfies a prescribed condition and a second time point at which the acceleration signal satisfies the prescribed condition again before a prescribed time period is elapsed from the first time point;
• to execute determination processing for determining whether the person is walking based on a feature quantity associated with the waveform portion of the acceleration signal within the time period;
• 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 prescribed condition includes an acceleration represented by the acceleration signal that changes from a first value more than a first threshold to a second value less than the first threshold, and an amount of change in the acceleration per unit time that exceeds a second threshold;
• and
• wherein the feature quantity includes at least one of:
• a time length between specific points in the waveform portion;
• a value of the acceleration at a specific point in the waveform portion;
• a difference between values of the acceleration at the specific points in the waveform portion;
• a statistic value of the acceleration at the specific point in the waveform portion;
• a difference between statistic values of the acceleration at the specific points in the waveform portion;
• and
• an amount of change in the acceleration per unit time between the specific points in the waveform portion.

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:
• define a time period as time between a first time point at which the acceleration signal satisfies a prescribed condition and a second time point at which the acceleration signal satisfies the prescribed condition again before a prescribed time period is elapsed from the first time point;
• to execute determination processing for determining whether the person is walking based on a feature quantity associated with the waveform portion of the acceleration signal within the time period;
• and to output a result of the determination processing to a control device configured to execute authentication processing for authenticating, by way of the mobile device, the person as a user of a controlled device,
• wherein the prescribed condition includes an acceleration represented by the acceleration signal that changes from a first value more than a first threshold to a second value less than the first threshold, and an amount of change in the acceleration per unit time that exceeds a second threshold;
• and
• wherein the feature quantity includes at least one of:
• a time length between specific points in the waveform portion;
• a value of the acceleration at a specific point in the waveform portion;
• a difference between values of the acceleration at the specific points in the waveform portion;
• a statistic value of the acceleration at the specific point in the waveform portion;
• a difference between statistic values of the acceleration at the specific points in the waveform portion;
• and
• an amount of change in the acceleration per unit time between the specific points in the waveform portion.

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;
• define a time period as time between a first time point at which the acceleration signal satisfies a prescribed condition and a second time point at which the acceleration signal satisfies the prescribed condition again before a prescribed time period is elapsed from the first time point;
• execute determination processing for determining whether the person is walking based on a feature quantity associated with the waveform portion of the acceleration signal within the time period;
• and
• output a result of the determination processing to a control device configured to execute authentication processing for authenticating, by way of the mobile device, the person as a user of a controlled device,
• wherein the prescribed condition includes an acceleration represented by the acceleration signal that changes from a first value more than a first threshold to a second value less than the first threshold, and an amount of change in the acceleration per unit time that exceeds a second threshold;
• and
• wherein the feature quantity includes at least one of:
• a time length between specific points in the waveform portion;
• a value of the acceleration at a specific point in the waveform portion;
• a difference between values of the acceleration at the specific points in the waveform portion;
• a statistic value of the acceleration at the specific point in the waveform portion;
• a difference between statistic values of the acceleration at the specific points in the waveform portion;
• and
• an amount of change in the acceleration per unit time between the specific points in the waveform portion.