Monitoring presence of authorized user during user session based upon mobile computing device motion

A computerized method for monitoring a presence of an authorized user of a mobile computing device during a user session based upon motion of the mobile computing device, the method comprising:

• entering, by the mobile computing device, a first operational mode based upon a user session established by a user;
• generating, by the mobile computing device, a first motion signature corresponding to motion of the mobile computing device generated by an involuntary physical movement particular to the user, wherein the first motion signature is based upon (i) first samples of first motion data obtained from a first sensor responsive to a first motion of the mobile computing device during the user session, and (ii) first samples of second motion data obtained from a second sensor responsive to a second motion of the mobile computing device during the user session;
• obtaining, by the mobile computing device, first samples of third motion data from a third sensor, the first samples of motion data corresponding to an altitude of the mobile computing device,
• wherein the first samples of third motion data are captured upon establishing the user session;
• determining, by the mobile computing device, a change in the altitude of the mobile computing device based upon second samples of third motion data obtained from the third sensor subsequent to obtaining the first samples of third motion data;
• generating, by the mobile computing device, an updated first motion signature based upon updated samples of first motion data and updated samples of second motion data, wherein the updated samples of first and second motion data are obtained subsequent to detecting the altitude change;
• generating, by the mobile computing device, a second motion signature based upon (i) second samples of first motion data obtained from the first sensor, and (ii) second samples of second motion data obtained from the second sensor;
• comparing, by the mobile computing device, the updated first motion signature and the second motion signature;
• and
• entering, by the mobile computing device, a second operational mode if a difference between the updated first motion signature and the updated motion signature exceeds a predetermined threshold.

A computer program product, tangibly embodied in a non-transitory computer readable storage device, for monitoring a presence of an authorized user of a mobile computing device during a user session based upon motion of the mobile computing device, the computer program product including instructions operable to cause the mobile computing device to:

• enter a first operational mode based upon a user session established by the user;
• generate a first motion signature data structure comprising (i) a first plurality of first motion statistics based upon an analysis of a plurality of first samples of first motion data obtained from a first sensor at predetermined intervals of time upon establishing the user session, and (ii) a first plurality of second motion statistics based upon an analysis of a plurality of first samples of second motion data obtained from a second sensor at predetermined intervals of time upon establishing the user session, the first motion signature corresponding to motion of the mobile computing device generated by an involuntary physical movement particular to the user;
• generate a second motion signature data structure comprising (i) a second plurality of first motion statistics based upon an analysis of a plurality of second samples of first motion data obtained from the first sensor at predetermined intervals of time beginning subsequent to capturing the plurality of first samples of first motion, and (ii) a second plurality of second motion statistics based upon an analysis of a plurality of second samples of second motion data obtained from the second sensor at predetermined intervals of time beginning subsequent to capturing the plurality of first samples of first motion;
• and
• enter a second operational mode if a difference between data of the first motion signature data structure and data of the second motion signature data structure exceeds a predetermined threshold.

A computer program product, tangibly embodied in a non-transitory computer readable storage device, for monitoring a presence of an authorized user of a mobile computing device during a user session based upon motion of the mobile computing device, the computer program product including instructions operable to cause the mobile computing device to:

• enter a first operational mode based upon a user session established by the user;
• generate a first motion signature corresponding to motion of the mobile computing device generated by an involuntary physical movement particular to the user, wherein the first motion signature is based upon (i) first samples of first motion data obtained from a first sensor responsive to a first motion of the mobile computing device during the user session, and (ii) first samples of second motion data obtained from a second sensor responsive to a second motion of the mobile computing device during the user session;
• obtain first samples of third motion data from a third sensor, the first samples of third motion data corresponding to an altitude of the mobile computing device,
• wherein the first samples of third motion data are captured upon establishing the user session;
• determine a change in the altitude of the mobile computing device based upon second samples of third motion data obtained from the third sensor subsequent to obtaining the first samples of third motion data;
• generate an updated first motion signature based upon updated samples of first motion data and updated samples of second motion data, wherein the updated samples of first and second motion data are obtained subsequent to detecting the altitude change;
• generate a second motion signature based upon (i) second samples of first motion data obtained from the first sensor, and (ii) second samples of second motion data obtained from the second sensor;
• compare the updated first motion signature and the updated motion signature;
• and
• enter a second operational mode if a difference between the updated first motion signature and the second motion signature exceeds a predetermined threshold.