Backscatter Limited Tags
First Claim
1. A method of communicating with a population of radio frequency identification (RFID) tags, comprising:
- transmitting a first interrogation signal;
receiving a response to the first interrogation signal from at least one RFID tag at a first received signal strength, wherein the response includes at least a portion of a first identification code; and
transmitting a second interrogation signal that includes a request for confidential information, a command to transmit a response to the second interrogation signal at a secure power level, and said first identification code.
4 Assignments
0 Petitions
Accused Products
Abstract
Methods and apparatuses for secure communications of confidential information are provided. In an embodiment, a method of communicating with a population of radio frequency identification tags includes transmitting a first interrogation signal, receiving a response to the first interrogation signal from at least one RFID tag at a first received signal strength including at least a portion of a first identification code, and transmitting a second interrogation signal that includes a request for confidential information, a command to transmit a response to the second interrogation signal at a secure power level, and the first identification code. In another embodiment, a method for communicating with an RFID tag includes receiving an interrogation signal that includes a request for confidential information and transmitting a response to the interrogation signal at a secure power level. The response includes the confidential information.
51 Citations
26 Claims
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1. A method of communicating with a population of radio frequency identification (RFID) tags, comprising:
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transmitting a first interrogation signal; receiving a response to the first interrogation signal from at least one RFID tag at a first received signal strength, wherein the response includes at least a portion of a first identification code; and transmitting a second interrogation signal that includes a request for confidential information, a command to transmit a response to the second interrogation signal at a secure power level, and said first identification code. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of communicating with a radio frequency identification (RFID) tag, comprising:
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receiving an interrogation signal that includes a request for confidential information; and transmitting a response to the interrogation signal at a secure power level, wherein the response includes the confidential information. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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20. A radio frequency identification (RFID) tag, comprising:
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a substrate; an antenna formed on a surface of the substrate; a power limiting module coupled to the antenna, wherein the power limiting module is configured to control a backscatter power level of the RFID tag; a storage that stores an identification code and confidential information; and a secure communications module configured to determine a secure power level with which to transmit RF signals that include confidential information. - View Dependent Claims (21, 22, 23, 24, 25)
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26. A system for performing a radio frequency identification (RFID) communications, comprising:
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means for receiving an interrogation signal that includes a request for confidential information; and means for transmitting a response to the interrogation signal at a secure power level, wherein the response includes the confidential information.
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Specification