System and method for proving physical presence

Patent metadata

Field	Value
Publication number	US-9747768-B1
Application number	US-201615053295-A
Country	US
Kind code	B1
Filing date	Feb 25, 2016
Priority date	Feb 25, 2016
Publication date	Aug 29, 2017
Grant date	Aug 29, 2017

Abstract

Methods and systems receive location identification tokens from transmitters using a portable computerized device. A first location identification token is received from a first location transmitting device, while the portable computerized device is within a predetermined distance from a designated location. A second location identification token is received from a second location transmitting device. A current location signature is calculated using the first and second location identification tokens. A previously stored location signature associated with the first and second location identification tokens is obtained from a computer readable storage medium. The current location signature is compared with the previously stored location signature to determine a similarity measure. The location identification tokens and the current location signature are stored in a memory and transmitted to a server. The presence of the portable computerized device at the designated location is verified based on the location identification tokens and the current location signature.

First claim

What is claimed is:

1. A portable computerized device, comprising:
a memory;
a wireless receiver simultaneously receiving a first location identification token from a first location transmitting device and a second location identification token from a second location transmitting device while said portable computerized device is within a predetermined distance from a designated location;
a processor operatively connected to said wireless receiver,
said processor automatically obtaining a previously stored location signature associated with said first location identification token and said second location identification token from a non-transitory computer readable storage medium, using said wireless receiver,
said processor automatically calculating a current location signature based on said first location identification token and said second location identification token,
said processor automatically comparing said current location signature with said previously stored location signature to determine a similarity measure of said current location signature and said previously stored location signature, and
said processor storing said first location identification token, said second location identification token, and said current location signature in said memory; and

a communications device operatively connected to said processor, said communications device transmitting said current location signature to a server as proof of presence of said portable computerized device at said designated location, using said processor.

2. The portable computerized device according to claim 1 , said wireless receiver comprising a short-wavelength UHF radio receiver.

3. The portable computerized device according to claim 1 , each of said first location identification token and said second location identification token comprising:
a tag identification; and
a timestamp.

4. The portable computerized device according to claim 3 , each of said first location identification token and said second location identification token further comprising a cryptographic scheme comprising a random cryptographic salt and a sequence number.

5. The portable computerized device according to claim 1 , said processor automatically interpreting each location identification token and identifying additional location transmittal devices based on information from one of said first location identification token and said second location identification token.

6. The portable computerized device according to claim 1 , further comprising:
a user interface operatively connected to said processor, said user interface displaying a current location identification validity message based on said similarity measure being above a predetermined threshold.

7. A system, comprising:
a server;
a first wireless location transmitting device transmitting a first location identification token;
a second wireless location transmitting device transmitting a second location identification token; and
a portable computerized device having computer-executable instructions, said portable computerized device comprising:
a memory,
a wireless receiver simultaneously receiving said first location identification token from said first wireless location transmitting device and said second location identification token from said second wireless location transmitting device while said portable computerized device is within a predetermined distance from a designated location,
a processor operatively connected to said wireless receiver, said processor storing said first location identification token and said second location identification token in said memory, and
a communications device operatively connected to said processor;
said computer-executable instructions causing:
said processor to automatically obtain a previously stored location signature associated with said first location identification token and said second location identification token from a non-transitory computer readable storage medium, using said communications device,
said processor to automatically calculate a current location signature based on said first location identification token and said second location identification token,
said processor to automatically compare said current location signature with said previously stored location signature to determine a similarity measure of said current location signature and said previously stored location signature, and
said processor to transmit said first location identification token, said second location identification token and said current location signature to said server, using said communications device, as proof of presence of said portable computerized device at said designated location.

8. The system according to claim 7 , said processor storing said first location identification token, said second location identification token, and said current location signature in said memory.

9. The system according to claim 7 , said first wireless location transmitting device and said second wireless location transmitting device comprising a short-wavelength UHF radio transmitters.

10. The system according to claim 7 , said wireless receiver comprising a short-wavelength UHF radio receiver.

11. The system according to claim 7 , each of said first location identification token and said second location identification token comprising:
a tag identification; and
a timestamp.

12. The system according to claim 7 , each of said first location identification token and said second location identification token further comprising a cryptographic scheme comprising a random cryptographic salt and a sequence number.

13. The system according to claim 7 , said portable computerized device further comprising:
a user interface operatively connected to said processor, said user interface displaying a current location identification validity message based on said similarity measure being above a predetermined threshold.

14. A method comprising:
receiving a first location identification token from a first location transmitting device, using a wireless receiver of a portable computerized device, while said portable computerized device is within a predetermined distance from a designated location;
simultaneously receiving a second location identification token from a second location transmitting device, using said wireless receiver of said portable computerized device;
automatically calculating a current location signature based on said first location identification token and said second location identification token;
automatically obtaining a previously stored location signature associated with said first location identification token and said second location identification token from a non-transitory computer readable storage medium, using a communications device of said portable computerized device;
automatically comparing said current location signature with said previously stored location signature to determine a similarity measure of said current location signature and said previously stored location signature;
automatically storing said first location identification token, said second location identification token, and said current location signature in a memory of said portable computerized device;
transmitting said first location identification token, said second location identification token, and said current location signature to a server, using said portable computerized device; and
verifying presence of said portable computerized device at said designated location based on said first location identification token, said second location identification token, and said cur

Assignees

• Xerox Corp

Inventors

• Zehler Peter J
• Tredoux Gavan
• Rajendran Premkumar

Classifications

• G01S5/0295

  Proximity-based methods, e.g. position inferred from reception of particular signals · CPC title

• H04L9/3247 Primary

  involving digital signatures · CPC title

• G06K7/10475

  arrangements to facilitate interaction with further interrogation devices, e.g. such that at least two interrogation devices may function and cooperate in a network of such devices · CPC title

• G06K19/06028

  using bar codes · CPC title

• G06K7/10158

  methods and means used by the interrogation device for reliably powering the wireless record carriers using an electromagnetic interrogation field · CPC title