Systems and methods to secure short-range proximity signals

A method for securely proving the location of a device, comprising:

• transmitting a time-varying and location-dependent short range signal from a beacon at a location;
• receiving data related to the short range signal from a device;
• and
• securely determining that the device is in the location by determining if the received data is consistent with data expected to be received from a device currently located in the location.

A system comprising:

• a device comprising:
• a receiver capable of receiving a short-range signal from a beacon at a location;
• a processor capable of obtaining data from the short-range signal, wherein the data is location-dependent and time-dependent;
• and
• a transmitter capable of communicating information related to the obtained data to a server;
• and
• a server comprising:
• a receiver capable of receiving the data related to the obtained data from the device;
• and
• a location facility capable of securely determining the location of the device, wherein securely determining the location of the device comprises verifying that the received data is consistent with the data expected to be received from a device currently located in the location.