Keypad security

A computer program product for detecting an overlay on a device, the computer program product comprising one or more computer readable storage media having program instructions collectively stored on the one or more computer readable storage media, the program instructions executable to:

• monitor for a signal from at least one sensor in an array of sensors located in predetermined positions associated with a surface of the device;
• in response to the monitoring, detect the signal from the at least one sensor indicating activation of the at least one sensor;
• initiate a timer in response to the activation of the at least one sensor;
• determine a number of sensors activated in the array of sensors;
• determine whether the number of sensors activated exceeds a threshold sensor number;
• in response to a determination the number of sensors activated exceeds the threshold sensor number and a value of the timer exceeds a threshold timer value, determine a security action;
• and
• initiate the security action,
• wherein the device comprises a keypad and the keypad is included in an electronic door lock.

A system comprising:

• a processor, a computer readable memory, one or more computer readable storage media, and program instructions collectively stored on the one or more computer readable storage media, the program instructions executable to:
• monitor for a signal from at least one sensor in an array of sensors located in predetermined positions associated with a surface of a keypad, wherein each of the sensors is a magnetic field sensor;
• in response to the monitoring, detect the signal from the at least one sensor indicating activation of the at least one sensor;
• initiate a timer in response to the activation of the at least one sensor;
• determine a number of sensors activated in the array of sensors;
• determine whether the number of sensors activated exceeds a threshold sensor number;
• in response to a determination the number of sensors activated exceeds the threshold sensor number and a value of the timer exceeds a threshold timer value, determine a security action;
• and
• initiate the security action.