Understanding Blocker Tags in Shopping Bags
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Questions and Answers

What is a characteristic of blocker tags according to the text?

  • They use collision-avoidance algorithms effectively.
  • They can be embedded in various items like shopping bags. (correct)
  • They respond to every possible bit-string.
  • They are known for their long communication distances.
  • What is a challenge posed by blocker tags deployed with denial-of-service approach?

  • Solving overlaps in address spaces of different users' blocker tags.
  • Interference with other applications of RFIDs. (correct)
  • Effective mapping of customers' tags to subsets for activation.
  • Increasing the communication distance of blocker tags.
  • How do Pseudonyms using MetaIDs (Hash-Locks) work based on the text?

  • They store the original ID directly onto the tag for security reasons.
  • They communicate using hash functions to compute values. (correct)
  • They modify the original ID permanently to protect privacy.
  • They respond with arbitrary key k without any hashing involved.
  • Which privacy protection measure recommends erasing unique serial numbers at the point of sale?

    <p>Disabling tags at the point of sale</p> Signup and view all the answers

    What is a significant concern related to inexpensive read-only RFID tags according to the text?

    <p>Absence of authentication for both tags and readers</p> Signup and view all the answers

    What is a challenge associated with the 'Kill' instruction in EPCglobal/Auto-ID Specification as mentioned in the text?

    <p>Potential enumeration of passwords to access the 'Kill' instruction</p> Signup and view all the answers

    What is the main purpose of the 'Blocker' tag discussed in the text?

    <p>To simulate all possible RFID tag serial numbers</p> Signup and view all the answers

    How does the 'Tree-walking' protocol described in the text work?

    <p>It asks all tags to reveal their next bit, leading to confusion with the 'Blocker' tag.</p> Signup and view all the answers

    How does the 'Blocker' tag system contribute to consumer privacy and commercial security?

    <p>By selectively blocking certain ranges of RFID-tag serial numbers in privacy zones.</p> Signup and view all the answers

    What is one advantage of using 'privacy zones' with the 'Blocker' tag system?

    <p>Enabling movement of items into privacy zones upon purchase for protection.</p> Signup and view all the answers

    What is the main function of a capacitance diode in a transponder according to the text?

    <p>Generating the 2nd harmonic for re-transmission</p> Signup and view all the answers

    How does the microchip in the transponder contribute to reducing interference as per the text?

    <p>By dividing the frequency by two before transmission</p> Signup and view all the answers

    What is a key characteristic of the security elements mentioned in the text?

    <p>They reverse magnetization periodically</p> Signup and view all the answers

    What is the purpose of load modulation in RFID technology?

    <p>To change the current in the primary coil of the reader</p> Signup and view all the answers

    Which technique is commonly used to encode data from the reader to the transponder in RFID technology?

    <p>Amplitude Shift Keying (ASK)</p> Signup and view all the answers

    How does changing the current in the tag's secondary coil affect data transmission back to the reader in RFID systems?

    <p>It modulates load to change current in the reader's primary coil</p> Signup and view all the answers

    How does the resonant LC-circuit interact with the alternating field in the vicinity according to the text?

    <p>It induces energy from the field via its coils</p> Signup and view all the answers

    What is the purpose of altering tags in the microwave range EAS systems as mentioned in the text?

    <p>To prevent activation of the anti-theft system</p> Signup and view all the answers

    Why are capacitance diodes highlighted as suitable nonlinear energy stores according to the text?

    <p>As they aid in frequency multiplication for harmonics</p> Signup and view all the answers

    What is the function of intentional short-circuit points, or dimples, in capacitors within transponders based on the text?

    <p>To facilitate frequency multiplication</p> Signup and view all the answers

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