Authenticity determination system of responder, identification system, and interrogation unit

• US 20080024269A1
• Filed: 01/25/2007
• Published: 01/31/2008
• Est. Priority Date: 07/28/2006
• Status: Active Grant

• Current Assignee: Fujifilm Business Innovation Corp. (Fujifilm Holdings Corporation)
• Original Assignee: Fuji Xerox Company Limited (Fujifilm Holdings Corporation)
• Inventors: Watanabe, Masao, Konishi, Yasuaki, Mizutani, Ryota, Iida, Kiyoshi, Funo, Hiroyuki
• Granted Patent: US 7,961,077 B2
• Time in Patent Office: Days
• US Class Current: 340/5.8
• CPC Class Codes: G06K 19/0672 with resonating marks
• CPC Class Codes: G06K 19/0675 the resonating marks being of the surface acoustic wave [SAW] kind SAW devices per se H03H9/64
• CPC Class Codes: H03H 9/6406 Filters characterised by a particular frequency characteristic

Abstract

A responder authenticity determination system, comprising: a responder that sends a response signal in response to a received signal; an interrogation signal generator that generates an interrogation signal having a random waveform; a transceiver that sends the generated interrogation signal to the responder, and receives a response signal from the responder; and an authenticity determination unit that determines authenticity of the responder based on the received response signal and the random waveform of the generated interrogation signal.

Claims

1. A responder authenticity determination system, comprising:

a responder that sends a response signal in response to a received signal;

an interrogation signal generator that generates an interrogation signal having a random waveform;

a transmitter that transmits the generated interrogation signal to the responder;

a receiver that receives a response signal from the responder; and

an authenticity determination unit that determines authenticity of the responder based on the received response signal and the random waveform of the generated interrogation signal.

2. The responder authenticity determination system according to claim 1, wherein:

the interrogation signal generator generates the interrogation signal based on an interrogation request signal; and

the authenticity determination unit revises the received response signal by removing the random waveform from the received response signal, and compares the interrogation request signal with the revised response signal.

3. The responder authenticity determination system according to claim 1,

wherein the authenticity determination unit performs the determination according to whether the random waveform is present in the response signal.

4. The responder authenticity determination system according to claim 1,

wherein the responder comprises:

an excitation unit that generates mechanical vibration upon receipt of the interrogation signal;

a surface acoustic wave generator that allows the mechanical vibration to propagate in the responder, so as to generate a surface acoustic wave; and

a converter that converts the surface acoustic wave into an electrical signal and outputs the electrical signal as a response signal.

5. The responder authenticity determination system according to claim 1,

wherein the random waveform is a waveform randomized with respect to time.

6. The responder authenticity determination system according to claim 1,

wherein the random waveform is a waveform randomized with respect to frequency.

7. The responder authenticity determination system according to claim 1,

wherein the random waveform is a waveform randomized with respect to phase.

8. The responder authenticity determination system according to claim 1,

wherein the random waveform is a waveform randomized with respect to amplitude.

9. A responder identification system, comprising:

a responder that sends a response signal in response to a received signal;

an interrogation signal generator that generates an interrogation signal having a random waveform;

a transmitter that transmits the generated interrogation signal to the responder;

a receiver that receives a response signal from the responder;

an authenticity determination unit that determines authenticity of the responder based on the received response signal and the random waveform of the generated interrogation signal; and

an identification unit that, when the responder is determined to be authentic in the authenticity determination unit, identifies the responder based on the interrogation signal and the response signal, or based on the response signal.

10. The responder identification system according to claim 9, wherein the identification unit comprises:

a storage unit that stores an ID assigned to each responder and a reference signals associated with the ID; and

an ID identification unit that identifies the ID of the responder by comparing the reference signal stored in the storage unit with a signal detected in the interrogation signal and the response signal or detected in the response signal.

11. An interrogation unit comprising:

an interrogation signal generator that generates an interrogation signal having a random waveform;

a transmitter that transmits the generated interrogation signal to a responder;

a receiver that receives a response signal from the responder; and

an authenticity determination unit that determines authenticity of the responder based on the received response signal and the random waveform of the generated interrogation signal.

12. The interrogation unit according to claim 11, further comprising:

an identification unit that, when the responder is determined to be authentic in the authenticity determination unit, identifies the responder based on the interrogation signal and the response signal, or based on the response signal.

13. An authenticity determination method, comprising:

generating an interrogation signal having a random waveform in an interrogation unit;

transmitting the interrogation signal from the interrogation unit to a responder;

transmitting, upon receipt of the interrogation signal, a response signal from the responder to the interrogation unit; and

determining, in the interrogation unit, authenticity of the responder based on the response signal received from the responder and the random waveform of the generated interrogation signal.