Detecting a blocker RFID tag

Details Detecting a blocker RFID tag Detecting a blocker RFID tag

2008-08-12

2010-12-07

Trieu, Van T. (Department: 2612)

Communications: electrical

Condition responsive indicating system

Specific condition

C340S572100, C340S010310

Reexamination Certificate

active

07847696

ABSTRACT:
For detecting a blocker RFID tag, the following steps are conducted. First, a random identifier of a given bit length is created. Alternatively, an identifier is selected out of a probing set, which is stored on a data storage device. The probing set comprises of identifiers, which are not being used as identifiers for a given set of RFID tags. In a second step, a response from all RFID tags is requested having an identifier matching the random identifier or, respectively, the selected identifier. In a third step, it is determined, depending on receiving or not receiving a response, whether the blocker RFID tag is present.

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A. Juels et al., “The Blocker Tag: Selective Blocking of RFID Tags for Consumer Privacy;” CCS '03; Oct. 27-30, 2003; Washington DC, USA.

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